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GTR 225/GNC 255 TSO Installation Manual

1. P2002 lea a GTR GNC REAR VIEW OF CONNECTOR PLATE Figure C 5 GTR GNC Rear Connector Layout Detail 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 7 A GARMIN _4 VY 6 32 OPTION 1 STACK CUTOUT RACK INSTALLED FROM FRONT OF AIRCRAFT PANEL 1 77 _ 6 32 OPTION 2 RADIO CUTOUT RACK INSTALLED FROM FRONT OF AIRCRAFT PANEL 1 65 6 25 3 RADIO CUTOUT RACK INSTALLED FROM BACK OF AIRCRAFT PANEL ONLY MAXIMUM AIRCRAFT PANEL THICKNESS IS 125 INCH NOTES ALL OPTIONS 1 DIMENSIONS ARE IN INCHES 2 IF THE FRONT LIP OF THE MOUNTING RACK IS BEHIND THE SURFACE OF THE AIRCRAFT INSTRUMENT PANEL THE UNIT CONNECTORS MAY NOT FULLY ENGAGE 3 TOLERANCE 0 03 INCHES Figure C 6 Panel Cutout Detail GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page C 8 Rev B GARMIN GTR GNC MOUNTING RACK DURING INSTALLATION OF THE MOUNTING RACK ENSURE EDGE OF THE TAB BOTTOM FLANGE OF THE RACK IS FLUSH WITH THE FACE OF THE INSTURMENT PANEL TAB Figure C 7 GTR Mounting Rack 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page C 9 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page C 10 Rev B GARMIN APPENDIX INTERC
2. 6 250 158 75 all 6 300 160 02 BEZEL TE jus ho d 9 090 mum 1 715 43 56 10 410 264 41 COAX 11 230 285 24 STRAIN RELIEF 2 200 5 08 THRU CS K 2 300 7 62 x 100 INSIDE RACK 3 PER SIDE 0 650 16 51 1 725 43 82 mE leri Ee 0 770 19 56 0 325 8 26 0 437 11 10 Figure C 1 GTR GNC Dimensions 190 01 182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page C 3 A GARMIN SCREW 4 40 X 250 GTR 225 GNC 255 TSO Installation Manual Page C 4 211 60234 08 4 7 115 01613 00 2 PART 330 00053 01 212 00022 00 2X SHOULDER WASHER 125 00281 20 SS GTR GNC BACKPLATE EN i N 011 02721 10 GNC CONNECTOR KIT Qed PART OF GNC CONNECTOR KIT SCREW 4 40 X 250 330 0
3. 6 20 6 8 2 Loading Software to the E ERN ESEN E asi 6 21 550 6 22 69 Documentation CHECKS L LLULLA napas spaawiahankekyakaaqawawasqawissaqayiasakapaspakipanpassapaqaqwanaqsqyaaqasa 6 22 6 9 1 Airplane Flight Manual Supplement 6 22 T 7 1 JL Calibration 7 1 2 101460 4 7 1 ONC 7 1 APPENDIX ENVIRONMENTAL QUALIFICATION FORMI A 1 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page iv Rev B GARMIN APPENDIX B GTR GNC DATA FORMAT 1 465 232 ___ __ __ ____ _ Eae 1 n2 NMEA toni 5 APPENDIX MECHANICAL DRAWINGS 1 TI C I DAR u 1 APPENDIX D INTERCONNECT DIAGRANLMN N D 1 i b u D 1 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page v A GARMIN List of Figures Figur
4. 3 1 32 Antenna L u 3 1 j CON 3 1 Mmmm 3 2 3 3 GTR GNC Mounting Considerations nn 3 2 3 4 Cabling and Wiring Considerations 3 3 S irenlstionand Coolin uuu sasa m Ts 3 4 3 4 4 INSTALLATION PROCEDURES 4 1 4 1 42 Niuscellancous ODLODS u 4 1 4 3 Optional Reference Material LLL aii 4 2 4 4 Installation Materials Required but not Supplied 4 2 441 Accessories Required but not Supplied 4 2 4 4 2 Materials Required but not Supplied New Installations Only 4 2 25 SPECIAL Ru L Lu eti _ __________ 4 3 CaS lastall Ioi u 4 4 pan MOULE 4 5 jJ JL Rack Tnstallall ll uuu 4 5 472 GUR GNG Unit REMO
5. COM 20 AWG 5A C B 28VDC 18 AWG 10A C B 14 VDC 28 VDC AVIONICS BUS 10A 14 VDC 20 AWG 5A C B 28VDC 18 AWG 10A C B 14 VDC AIRCRAFT GROUND TO DISPLAY DIMMER TO KEYPAD ZA DIMMER GPS Source 1 5 232 GND 20 AWG 28VDC AVIONICS BUS 18 AWG 14 VDC 2A 28 VDC 4A 14 VDC 20 AWG 28VDC 18 AWG 14 VDC AIRCRAFT GROUND 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS SHIELD BLOCK GROUND y AIRFRAME GROUND 3 AT THE GTR GNC CONNECT SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SHIELD LEADS SHOULD BE LESS THAN 3 0 CONNECT OTHER SHIELD GROUNDS TO AIRCRAFT CHASSIS WITH AS SHORT A CONDUCTOR AS PRACTICAL PPP ALL POWER LEADS AND GROUND LEADS ARE REQUIRED CONNECTOR P2002 IS ONLY APPLICABLE TO THE GNC 255 OPTIONAL CONNECTION LIGHTING CAN BE CONTROLLED BY THE INTEGRATED PHOTOCELL A SINGLE LIGHTING BUS OR DUAL LIGHTING BUSES Figure D 3 GTR GNC Power Lighting Configuration Interconnect GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 6 Rev B GARMIN SINGLE GTR GNC INSTALLATION A VOR LOC GS Antenna GTR GNC COM Antenna COM Antenna DUAL GTR GNC INSTALLATION A GTRIGNC 1 A VOR LOC GS Antenna A V 1 Splitter GTR GNC 2 Antenna Figure D 4 GTR GNC Antennas Interconnect Sheet 1 of 4 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B
6. GARMIN 5 1 2 P2002 Connector NAV Board View looking at rear of unit Pin 1 is bottom left 76 OW RESERVED 78 comPosmE out On 79 VOROBROTORG 710 VOROBSROTORH ND 3 vorosssmrore en SRE 7 RESERVED 190 01182 02 225 GNC 255 TSO Installation Manual Rev B Page 5 3 A GARMIN Pn emne OOOO 48 RSERED w 50 Resev 60 ARCRAFTGND A A G P P R G R GTR 225 GNC 255 TSO Installation Manual 190 01 182 02 Page 5 4 Rev B GARMIN 5 2 Power Lighting And Antennas This section covers the power input requirements lighting bus input and antenna connections See Appendix D for interconnect information 5 2 1 Power Power inputs P2001 30 P2001 43 and P2001 44 provide power for the COM radio All three pins must be connected Power inputs P2002 51 and P2002 52 provide power for the NAV radio Both pins must be connected in Namie Pm ARCRAFTGROUD AIRCRAFT GROUND In 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 5 5 A GARMIN 5 2 2 Lighting Bus Ay CAUTION Connection of the lighting bus to incorrect pins can cause damage to the unit that will require return to the factory for repair Ensure that the lighting bus is connected to the correct pins and does not short to any
7. NECESSARY INSTALL A TOGGLE SWITCH FOR THE DME COMMON INPUT INSTALL SWITCH AS SHOWN FOR KING SERIAL PANEL DME INTERCONNECT Figure D 12 Parallel Slip Code DME Tuning Interconnect GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 22 Rev B GARMIN LV 0 61 H gt H gt 8l 00 N MS NOILOATAS AVN AVN NOWIAOO 3a o o TANNVHO AVNY 1 1 sna viva l l 40019 vl vl ___ Lv9d LVC9d 1 9 V9NM VC9 C9N ONDI XION38 S3AI39SNV8 L JWA d31NnOW 13NVd SING TVI213S ANd VINAS VIVG AWd Tvlsd3S 320 IO7 3ING 1885 IND HO AVN3ING VINAS VIVG AWd 7195 320 10 SW 1885 Panel Mount Interconnect Figure D 13 GNC King Serial DME Sheet 1 of 2 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Rev Page D 23 A GARMIN NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS 5 SHIELD BLOCK GROUND AIRFRAME GROUND 3 AT GNC CONNECT SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SHIELD TERMINATION LEADS SHOULD BE LESS THAN 3 0 CONNECT OTHER END OF THE SHIELD PER THE REMOTE EQUIPMENT INSTALLATION REQUIREMENTS IF NO SHIELD TERMINATION REQUIREMENT EXISTS FOR THE REMOTE EQUIPMENT TERMINATE SHIELDS AS SHORT AS POSSIBLE NOT TO EXCEED 3 0 SEE SECTION TBD 4 REFER TO MANUFACTURER S D
8. 5 NMOd 5 5 3ZIOH3N 51 INO ALISOdNOD OO TfdOA SV 1d SV 1d 9O TfdOA OO TfdOA 01 DOT YOA LHOIY 9OTHOA 1451 7 GTR GNC 5 Interconnect Figure D Sheet 1 of 2 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Page D 14 Rev B GARMIN NOTES 1 ALL WIRES 24 AVG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS Z SHIELD BLOCK GROUND AIRFRAME GROUND 3 SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SHIELD TERMINATION LEADS SHOULD BE LESS THAN 3 0 CONNECT OTHER END OF THE SHIELD PER THE REMOTE EQUIPMENT INSTALLATION REQUIREMENTS 4 REFER TO MANUFACTURER S DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT INFORMATION PINOUTS OF OTHER UNITS SHOWN FOR REFERENCE ONLY Figure D 7 GTR GNC VORIILS Interconnect Sheet 2 of 2 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page D 15 A GARMIN GTR GNC P2001 COM REMOTE TRANSFER 27 2 1 A COM REMOTE TUNE UP 28 V COM REMOTE TUNE DOWN 29 LN ON INTERCOM ENABLE 12 Q o 1 A OFF P2002 1 VLOC REMOTE TRANSFER NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS Y SHIELD BLOCK GROUND AIRFRAME GROUND COM REMOTE TRANSFER CAN BE USED TO TRANSFER THE STANDBY COM FREQUE
9. ETSO information See Current Revision Description for details 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page A A GARMIN CURRENT REVISION DESCRIPTION Section Number Description of Change 1 3 4 2 Updated the classes in the COM receiver specifications table Added DO levels and ETSO information in Table 1 3 Added deviation for ETSO 2C40c Added RS 232 table Updated Figure D 3 Updated Figure 0 14 DOCUMENT PAGINATION Section Pagination GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page B Rev B GARMIN INFORMATION SUBJECT TO EXPORT CONTROL LAWS This document may contain information which 1 subject to the Export Administration Regulations EAR issued by the United States Department of Commerce 15 CFR Chapter VII Subchapter C and which may not be exported released or disclosed to foreign nationals inside or outside of the United States without first obtaining an export license A violation of the EAR may be subject to a penalty of up to 10 years imprisonment and a fine of up to 1 000 000 under Section 2410 of the Export Administration Act of 1979 Include this notice with any reproduced portion of this document This information in this document is subject to change without notice Visit the Garmin web site www garmin com for current updates and supplemental information concerning the operation of Garmin products DEFINITIONS OF WARNINGS C
10. Valid flag 0 zero OBS invalid not present OBS setting is valid Three digit OBS setting in degrees Values in the range of 000 to 4359 Example message PGRMV22V 170 lt chksm gt lt CR gt lt LF gt A valid OBS setting of 170 degrees B 2 4 2 8 Radial From Active VOR This message outputs the current bearing from the active VOR station Message format i uw Message class This is a VHF NAV message Ec PES Message identifier M Valid flag 0 bearing not valid V bearing is valid ua asun saa Bearing to a resolution of 1 10th of a degree ddd three digit bearing in degrees ranging from 000 to 359 f 110 of a degree Example message PGRMV23V1654 lt chksm gt lt CR gt lt LF gt A valid bearing of 165 4 degrees FROM the active VOR station B 2 4 2 9 Decoded Station Identifier This message outputs the decoded station identifier received on the NAV voice channel This message will be output even if the station identifier has not been decoded yet In this case the message will be flagged as invalid Note that the validity of this message does not depend on the current NAV audio mode The decoding is done automatically regardless of this setting Message format S Message class This is a GNC NAV message E Message identifier Valid flag 0 identifier is not valid V decoded station identifier is valid D
11. ae UC ne basa 6 16 Table B 1 Aviation Output Sentence Format nennen enne nennen nennen neni B 2 Table B 2 Type 2 Aviation Output Sentence Format JLI aka eese a nnn B 4 Table Input Message Summary u a i hausse kasa B 19 Table 4 Output Message Summary iinit inn iE eir Eanna B 19 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page viii Rev B GARMIN GTR 225 GNC 255 HARDWARE MOD LEVEL HISTORY The following table identifies hardware modification Mod Levels for the GTR 225 GTR 225A GTR 225B GNC 255A and GNC 255B Mod Levels are listed with the associated service bulletin number service bulletin date and the purpose of the modification The table is current at the time of publication of this manual see date on front cover and is subject to change without notice Authorized Garmin Sales and Service Centers are encouraged to access the most up to date bulletin and advisory information on the Garmin Dealer Resource web site at www garmin com using their Garmin provided user name and password SERVICE SERVICE BULLETIN BULLETIN PURPOSE OF MODIFICATION NUMBER DATE 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page ix A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page x Rev B A GARMIN 1 GENERAL DESCRIPT
12. After accomplishing a continuity check perform power and ground checks to verify proper power distribution to the GTR GNC Any faults or discrepancies should be corrected at this time Remove power from the aircraft upon completion of the harness checkout The GTR GNC can be installed after completion of the continuity and power checks The GTR GNC should be installed into the rack and secured appropriately as described in Section 4 7 1 The GTR GNC must be connected to the wiring harness and antennas Ay CAUTION When 14 VDC or 26 VDC lighting buses are connected to the GTR GNC connection of the aircraft lighting bus to the incorrect input pins can cause damage to the GTR GNC Always start this test with the dimming bus at the lowest setting and slowly increase the brightness If it is noticed that the lighting level on the GTR GNC does not increase as the lighting bus input is increased in brightness verify that the wiring is correct before proceeding 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 1 A GARMIN 6 3 Connector Engagement Check Prior to configuration and checkout of the GTR GNC the connector engagement should be checked as described below 1 Turn on the avionics master switch if installed 2 Place the GTR GNC in the rack and engage the cam mechanism 3 Turn the Allen screw of the locking cam located on the lower left side of the unit slowly clockwise until the GTR GNC just powers o
13. GARMIN GTR 225 GNC 255 TSO Installation Manual EU C 190 01182 02 March 2013 Revision B GARMIN Copyright 2013 Garmin International Inc or its subsidiaries All Rights Reserved Except as expressly provided herein no part of this manual may be reproduced copied transmitted disseminated downloaded or stored in any storage medium for any purpose without the express prior written consent of Garmin Garmin hereby grants permission to download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited At Garmin we value your opinion For comments about this guide please e mail Techpubs Salem garmin com Garmin International Inc 1200 E 151st Street Olathe KS 66062 USA Telephone 913 397 8200 Aviation Dealer Technical Support Line Toll Free 888 606 5482 Web Site Address www garmin com Garmin Europe Ltd Liberty House Bulls Copse Road Hounsdown Business Park Southampton SO40 9LR UK Telephone 44 0 23 8052 4000 RECORD OF REVISIONS NELLE 11 30 12 Initial Release lt ay Release
14. nd COM Transceiver 006 CO01 35 23 thru 2 1 Complete I Incomplete TSO 2 ETSO 2C128 and ETSO 2C169a not applicable to the 225 1 5 1 Non TSO Functions There are no non TSO functions Table 1 4 System Functions System Function DO 178B ED 12B Level DO 254 ED 80 Level 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 1 9 GARMIN 1 5 2 TSO Deviations TSO ETSO 1 Garmin was granted a deviation from the TSO not to mark TSO number and software part number on the exterior of the unit 2 Garmin was granted a deviation from the TSO to use RTCA DO 160F instead of an earlier TSO C34e version as the standard for environmental conditions and test 3 Garmin was granted a deviation from the TSO to use RTCA DO 178B instead of an earlier version to demonstrate compliance for the verification and validation of the computer software 1 Garmin was granted a deviation from the TSO not to mark TSO number and software part number on the exterior of the unit 2 Garmin was granted a deviation from the TSO to use RTCA DO 160F instead of an earlier TSO C36e version as the standard for environmental conditions and test 3 Garmin was granted a deviation from the TSO to use RTCA DO 178B instead of an earlier version to demonstrate compliance for the verification and validation of the computer software 1 Garmin was granted a deviation from the TSO n
15. measured by the photocell the GTR GNC LIGHTING BUS 1 BUS 1 LIGHTING BUS 1 Backlight or bezel key levels track the lighting bus 1 levels LIGHTING BUS 2 Bezel key lighting levels track the lighting bus 2 levels The minimum brightness level of the display and bezel keys can also be configured on the Backlight page This will set the minimum brightness of the bezel keys or display The display minimum brightness level has a range from 1 to 100 The default level 1 1 The bezel key minimum brightness level has a range from 0 to 100 The default level 15 1 GTR 225 GNC 255 TSO Installation Manual 190 01 182 02 Page 6 4 Rev B A GARMIN 6 4 1 5 Photocell The Photocell page Figure allows the installer to configure the parameters of the photocell See Table 6 4 for description of each parameter PHOTOCELL 5 5 SLOPE 50 KEY C0 8 OFFSET 89 Figure 6 6 Photocell Page Table 6 4 Photocell Page Parameter Description When a lighting bus is used to control the lighting of the display this parameter sets the point on the lighting bus control below which the display brightness tracks the GTR GNC photocell This field has a range of 5 to 50 and is set to 25 as the default setting TRNSN Transition Sets the sensitivity the brightness of the display or keys has to changes in the photocell input level Adjusting the slope higher will result in a brighter display for a given increas
16. 100 asas Active VOR LOC frequency m desired frequency in MHz in hexadecimal where m desired frequency 30h with desired frequency in range of 108 to 117MHz k desired frequency in KHz where k desired frequency 25KHz 30h with desired frequency in range of 000 to 950K Hz in SOKHz steps or the even numbers from 30h to 56h Reserved data in this field will be ignored 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page B 9 A GARMIN Example message PGRMV27E40 lt chksm gt lt CR gt lt LF gt This example command would set the active VOR frequency to 117 100MHz This can be interpreted by noting that the ASCII E corresponds with 45h 30h 75h converted to decimal equals 117 for the MHz portion of the command The KHz portion converts ASCII 4 to 34h 30h 4h x 25KHz steps 100K Hz Note The GNC will check input frequencies for validity An RS 232 serial error message output will be generated if the frequency is invalid B 2 4 1 8 Set Standby NAV Frequency This message is used to set the standby NAV Message format SN ut Message class This is a GNC NAV message p nn Message identifier Standby VOR LOC frequency m desired frequency in MHz in hexadecimal where m desired frequency 30h with desired frequency in range of 108 to 117MHz k desired frequency in KHz where k desired frequency 25KHz 30h with desired frequency in range of 00
17. 156 Reserved Bit 2 Localizer detect 1 using localizer Bit 3 FROM flag 1 From Bit 4 TO flag 1 To Bit 5 GSI superflag 1 hidden Bit 6 GSI valid 1 valid Bit 7 NAV superflag 1 hidden Bit 8 msb NAV valid 1 valid PGRMV219 lt 64 lt chksm gt lt CR gt lt LF gt This message indicates a full left CDI deflection 100 a full up VDI deflection 100 both the GSI and NAV flags superflags are valid TO flag set FROM flag not set using a localizer 1 Encoded hex each character consists of 4 bits of data placed in the low order nibble 30h For example the 8 bit value 5Fh would be encoded as two characters with values of 35h and 3Fh which map to the ASCII characters 5 and respectively 2 The TO and FROM flag can not both be 1 indicating that they are both valid They can both be zero indicating that neither is valid This situation will occur whenever the receiver determines that it 15 within the cone of confusion directly over a VOR or when no signal is being received 190 01182 02 Rev GTR 225 GNC 255 TSO Installation Manual Page B 15 GARMIN B 2 4 2 7 Decoded OBS setting This message outputs the current OBS setting which may be read from the NAV s internal resolver the last valid value received over serial or from user input to the front panel Message format ub d Message class This is a GNC NAV message Message identifier V us
18. Backplate Assembly 011 02722 00 225 225 225 Mounting Rack 115 01613 00 Product Information Kit K00 00554 10 Connector Kit 011 02721 10 Backplate Assembly 011 02722 10 GNC 255A GNC 255B Mounting Rack 115 01613 00 Product Information Kit K00 00554 20 4 2 Miscellaneous Options x m ar PN Mg PIN GPS 1 57542 GHz Notch Filter 330 00067 00 Connector TNC Male Clamp 031 4452 1 1 This part is not available from Garmin Vendor Contact Information provided for convenience only Amphenol RF Four Old Newtown Road Danbury CT 06810 Phone 800 627 7100 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 4 1 A GARMIN 4 3 Optional Reference Material GTR 225 Pilot s Guide 190 01182 00 GNC 255 Pilots Guide 190 01182 01 4 4 Installation Materials Required but not Supplied 4 4 1 Accessories Required but not Supplied The following installation accessories are required but not provided 12 O COM Antenna Meets TSO C37 and C38 or TSO C169 500 vertically polarized with coaxial cable Meets TSO C40 and C36 500 horizontally polarized with coaxial NAV Antenna cable Note that if the NAV antenna is a combined VOR LOC GS antenna it must meet TSO 40 C36 and C34 Meets TSO C34 500 horizontally polarized with coaxial cable or low loss splitter used with the VOR LOC antenna Headphones 5000 nominal imp
19. In accordance with Canadian Radio Specifications Standard 102 RSS 102 RF field strength exposure to persons from an antenna connected to this device should be limited to 60V m for controlled environment and 28 V m for uncontrolled environment 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 3 1 GARMIN 3 2 2 Interference of GPS On some installations VHF COM transceivers Emergency Locator Transmitter ELT antennas and Direction Finder DF receiver antennas can re radiate through the GPS antenna Placement of the GPS antenna relative to a COM transceiver and COM antenna including the GTR GNC COM antenna ELT antenna and DF receiver antenna 1 critical Use the following guidelines in addition to others in this document when locating the GTR GNC and its antennas Locate the GTR GNC as far as possible from all GPS antennas Locate the COM antenna as far as possible from all GPS antennas Ifa COM antenna is found to be the problem a 1 57542 GHz notch filter Garmin P N 330 00067 00 may be installed in the VHF COM coax as close to the COM as possible This filter is not required for the GTR GNC transmitter If a COM is found to be radiating the following can be done Replace or clean VHF COM rack connector to ensure good coax ground Place a grounding brace between the GTR GNC VHF COM and ground Shield the VHF COM wiring harness 3 3 GTR GNC Mounting Considerations The GTR GNC 1s des
20. desired frequency 30h with desired frequency in range of 118 to 136 MHz k desired frequency in KHz where k desired frequency 25 KHz 30h with desired frequency in range of 000 to 975 KHz in 25 KHz steps Transceiver function normal monitor 0 unchanged 8 33 KHz offset ASCII 0 25 KHz frequency 000 1 first 8 33 KHz channel offset 005 2 second 8 33 KHz channel offset 010 3 third 8 33 KHz channel offset 015 Example message PGRMC00G4N0 lt chksm gt lt CR gt lt LF gt This example command would set the active COM frequency to 119 100 MHz and place the COMM radio in Normal receive mode This is interpreted by noting that the ASCII corresponds with 47h 30h 77h converted to decimal equals 119 for the MHz portion The KHz portion converts ASCII 4 to 34h 30h yields 4h x25K Hz steps 100 KHz with no 8 33 KHz channel offsets Note The GTR GNC will check input frequencies for validity An RS 232 serial error message output will be generated if the frequency 15 invalid or an 8 33 KHz frequency is requested when the GTR GNC is in 25 KHz channel spacing mode Note The GTR GNC will ignore this message while transmitting on the active COM frequency 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page B 7 GARMIN B 2 4 1 3 Set Standby COM Frequency and Transceiver Function This message is used to set the standby COM frequency as well as the
21. mE COM locked out ASCII 0 OK 1 Active frequency locked at 121 500 MHz 190 01182 02 225 GNC 255 TSO Installation Manual Rev B Page B 13 A GARMIN Example message PGRMC1300100001 lt chksm gt lt CR gt lt LF gt GTR GNC 1 running and ready to accept serial input Push to Talk is stuck on and 1 locked to 121 500 MHz B 2 4 2 5 GNC Status This message is sent to indicate to the host that the GNC 1s running and ready to accept data on the serial port along with the current status of alerts It will be sent once upon startup when requested by the host and when an alert s status changes This message is only available in normal mode Message format E um Message class This is a VHF NAV message pd usnu Message identifier VLOC needs Service 0 OK 1 Lateral course guidance not reliable VLOC Status ASCII 0 1 VLOC and Glide slope course guidance not avallable Glide Slope needs service ASCII 0 1 Vertical course guidance not reliable Glide Slope Status 0 1 Glide slope course guidance not avallable remote transfer stuck ASCII 0 OK 1 stuck Example message PGRMV4100010 lt chksm gt lt CR gt lt LF gt GNC 1 running and ready to accept serial input and glide slope guidance is unavailable GTR 225 GNC 255 TSO Installation Manual 190 01
22. 11 23 in face of aircraft panel to rear of connector backshells 225 Weight Unit Only 2 36 lbs 1 07 kg GNC 255 Weight Unit Only 3 02 16 1 37 kg 225 Installed with rack and connectors 3 06 Ibs 1 39 kg GNC 255 Installed with rack and connectors 3 96 Ibs 1 80 kg 1 3 2 General Specifications Characteristics Specifications 20 C to 55 C For more details see Environmental Qualification Form on the Dealers Only page on www garmin com See Appendix A for part numbers Humidity 95 non condensing Altitude Range 1 500 ft to 55 000 ft Input Voltage Range COM Connector 9 to 33 VDC Operating Temperature Range Input Voltage Range NAV Connector 9 to 33 VDC GTR Current Draw Refer to Table 1 2 Superflag Power Requirements 320 mA maximum per superflag output See Environmental Qualification Form on the Dealers Only page on www garmin com See Appendix A for part numbers Environmental Testing GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 1 2 Rev B GARMIN 1 3 3 Display The display on the GTR GNC 1 a sunlight readable LCD display Characteristics Specifications Width 3 46 88 0mm Display Size Height 0 843 21 4mm Width 2 95 74 98mm Height 0 Js 12 36mm Active Area Left 45 Right 45 Up 10 Down 30 Viewing Angle 1 3 4 COM Specifications 1 3 4 1 COM Transmitter Specifications Characteristics Specifications Classes 13456 0 00 4
23. 4 allows the installer to configure which intercom mode is enabled or disabled See Table 6 2 for available selections INTERCOM ENABLE Figure 6 4 Intercom Enable Page Table 6 2 Intercom Enable Page Selections Allows the intercom to be enabled or disabled via a menu option on the GTR GNC DISPLAY display After selecting Display the intercom enable disable setting will appear in normal mode selecting DISCRETE allows the intercom to be enabled or disabled a remote DISCRETE switch connected to the INTERCOM discrete input P2001 12 This selection will remove the menu option to enable disable the intercom 6 4 1 4 Backlight The Backlight page Figure 6 5 allows the installer to select the source for the display and bezel key lighting Minimum brightness levels of the display and key are also configured on the Backlight page BACKLIGHT ore NN Lu LIGHT BUS 1 BEZEL PHOTOCELL DSP KEY Figure 6 5 Backlight Page The display source can be configured to track either the photocell or lighting bus 1 The bezel key source can be configured to track the photocell lighting bus 1 or lighting bus 2 See Table 6 3 for description of selections on the Backlight page Table 6 3 Backlight Selections Selection Description Backlight or bezel key lighting level is determined by the ambient light level as
24. 5 6 Two inputs standard carbon I IV mic with integrated preamp P P providing minimum 70 mVRMS into 1000 load Modulation Capability 85 with 100 to 1000 mVRMS microphone input at 1000 Hz AM Double sided Emission Designator 6K00A3E 118 136 975 MHz oK60AS3E 118 136 992 MHz 118 000 to 136 975 MHz 25 kHz channel spacing 1 3 118 000 to 136 992 MHz 3 33 kHz channel spacing Modulation Frequency Tolerance 2ppm from 40 C to 70 Output Power 10 Watt Mode 10 watts minimum 4 16 Watt Mode 16 watts minimum 10W 100 Duty Cycle 16W Recommended 25 5 seconds on 15 seconds off 15 seconds on 45 seconds off etc Carrier Noise Level At least 35 dB SNR Stuck Time Out Mic Time Out 30 seconds time out reverts to receive Less than 5 distortion when the transmitter is at 85 modulation at 350 to 2500 Hz Demodulated Audio Distortion 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 1 3 A GARMIN 1 3 4 2 COM Receiver Specifications Characteristics Specifications EregueneviRande 118 000 to 136 975 MHz 25 kHz channel spacing 3 118 000 to 136 992 MHz 3 33 kHz channel spacing Headset Audio Output 100 mW minimum into a 500 Q load Audio Response Less than 6 dB of variation between 350 and 2500 Hz Audio Distortion Less than 5 at rated output power AGC Characteristics Less than 3 dB of variation in the audio output fr
25. COM transceiver function Message format utm Message class This is a GTR GNC COM message Message identifier Standby frequency m desired frequency in MHz in hexadecimal where m desired frequency 30h with desired frequency in range of 118 to 136MHz k desired frequency in KHz where k desired frequency 25 KHz 30h with desired frequency in range of 000 to 975KHz m 25KHz steps sns Transceiver function N normal M monitor 0 unchanged 8 33 KHz offset ASCII 0 25 KHz frequency 000 1 first 8 33 KHz channel offset 005 2 second 8 33 KHz channel offset 010 3 third 8 33 KHz channel offset 015 Example messages PGRMCO01KFM2 lt chksm gt lt CR gt lt LF gt This example command would set the standby COM frequency to 123 565MHz and place the COMM radio in Monitor mode This is interpreted by noting that the ASCII G corresponds with 47h 30h 77h converted to decimal equals 119 for the MHz portion The KHz portion converts ASCII F to 46h 30h yields 16h x25KHz steps 550KHz 3 8 33 channels 565KHz Note The GTR GNC will check input frequencies for validity An RS 232 serial error message output will be generated if the frequency 15 invalid or an 8 33 KHz frequency 1 requested when the GTR GNC is in 25 KHz channel spacing mode 2 4 1 4 Set COM Volume Level and Audio Control Parameters This input 1 used to set the volume leve
26. Cal Resolver to calibrate the OBS resolver 2 Press ENT Follow the directions on the GNC display gt CAL OBS RESOLVER SELECT 150 DEGREES l HE a gu HEXT THEN PRESS THE ENT BUTTON Figure 6 23 Calibrate OBS Resolver Page 4 Atthe end of setup press ENT to store results 5 Tune to any VOR frequency 6 Press the OBS key 7 Verify that the OBS decoded properly from 0 to 360 degrees If the GNC will not accept the calibration there may be a problem with the resolver interface Verify wiring and contact Garmin for assistance if necessary 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 13 GARMIN 6 5 2 Flags Check GNC Only The Flags test sends an active signal for each selected flag so you can test the interface to the connected devices directly from the front panel while you are on the ground The Flag tests include NAV NAV GS Glideslope and T F To From The Test Analog Flag page Figure 6 24 can be found in the NAV group Figure 6 1 Some CDIS HSIs require that the ILS ENERGIZE discrete be active for flags check and CDI VDI check to function properly INVALID Figure 6 24 Test Analog Flags Page Select the Test Analog Flags page Press ENT 2 Turn the large outer knob to change the flag selection Turn the small knob to select valid or invalid Check the connected indicator for the appropriate flag 3 Turn
27. DME 891 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 6 8 Rev B GARMIN 6 4 2 3 2 A429 Table 6 10 A429 Settings Selection Description S If the is connected to a multi channel ARINC 429 DME channel 1 of Directed Freq 1 that DME is tuned Direct Freq 1 should be selected if a single channel ARINC 429 DME is to be tuned Directed Frea 2 If the GNC is connected to a multi channel ARINC 429 DME channel 2 of q that DME is tuned 6 4 2 4 NAV Info The NAV Info page Figure 6 12 allows the installer to view and verify the NAV board software version software part number and hardware version IMFORMAT H VER B H 60082 12 npa FAGER Figure 6 12 NAV Information Page 6 4 2 5 NAV Update Garmin recommends the use USB 2 0 compatible USB flash drive for updating databases and software on GTR GNC FRESS ENT T EEGIFM HA UPORTE Figure 6 13 NAV Software Update Page Refer to Section 6 8 for Instructions on loading software to the GTR GNC 6 4 3 Configuration 6 4 3 1 Gain The MIC Gain page Figure 6 14 allows the installer to set the MIC gains for MIC 1 and MIC 2 The MIC I and MIC 2 gain can be adjusted from 12 dB to 30 dB in 6 dB increments The default is 12 dB For MICs with low signal levels this can be adjusted up to increase the signal strength For MICs with high
28. INFORMATION PINOUTS OF OTHER UNITS SHOWN FOR REFERENCE ONLY 5 THE GNC MAY BE CONFIGURED INSTALLATION TO OUTPUT KING SERIAL DME TUNING DATA UNDER THE DME CHANNEL MODE REFER TO SECTION TBD FOR CONFIGURATION SETTINGS 6 FOR SINGLE GNC INSTALLATIONS WIRE AS SHOWN FOR GNC 1 Figure D 10 King Serial DME Remote Mount Interconnect Sheet 2 of 2 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page D 19 124145 3009 098 124145 dS 124145 484025 X 3 ZHN Ob V ZHW OL NOWINOO NOWINOO AW V ZHMO0S JWA Vd 3 ZHM00 Vd Q ZH900 AWC Yvd O ZHM00 AWC amp Vd 8 ZHM00 AWC Vd AW IVIH3S V ZHM00I AWC Vd 09 3 ZHM 001 Q ZHM 001 O ZHM 001 7 001 V ZHM 001 3 ZHMW 3 ZHN 3IAC dvd Q ZHW L O ZHW a ZHW I V ZHW NO AWC IVIH3S Q ZHIN I Vd I ZHWI AWC gq ZHN AWC dvd V ZHINV AWC td td 68 068 awa ZP 3Wa OOHVN OONVN SNITIOO SNITIOO BNDI XIGN38 V YY Y GARMIN Figure D 11 Parallel 2 of 5 DME Tuning Interconnect Sheet 1 of 2 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Page D 20 Rev A GARMIN NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED GROUND DESIGNATIONS Z SHIELD BLOCK GROUND AIRFRAME GROUND REFER TO MANUFACTURER S DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT INFORMATION PINOUTS OF OTHER UNITS SHOWN FOR
29. Ifthe GNC is set up to remotely channel a DME verify the interface as described in this section 2 Select a VOR ILS channel that corresponds to 1 a DME station within a 40 nautical mile range or 2 the frequency of a DME ground tester 3 Verify that the DME locks on to the signal and a valid distance is displayed Tune an invalid VOR station Verify that the DME data is flagged GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 6 18 Rev B A GARMIN 6 7 Flight Checks 6 7 1 COM Flight Check After the installation is complete a flight check is required to ensure satisfactory performance To check the communications transceiver maintain an appropriate altitude and contact a ground station facility at a range of at least 50 nautical miles Contact a ground station in close proximity Press the COM volume knob to select manual squelch and listen for any unusual electrical noise which would increase the squelch threshold If possible verify the communications capability on both the high low and mid bands of the VHF COM band It may be required by the governing regulatory agency to verify operation of the COM transmitter and receiver at the extents of a ground facility s service volume e g FAA AC 23 8 6 7 2 VOR Flight Check GNC Only 1 Tunea local VOR station within 50 miles 2 Verify the audio IDENT and voice quality and verify that no objectionable electrical interference such as magneto noise 1 present 3
30. Page D 7 A GARMIN SINGLE GNC DUAL NAV ANTENNA INSTALLATION A G S Antenna VOR LOC Antenna Diplexer 1 VOR GNC P2004 COM Antenna _ w FS P2003 CN cat Fe DUAL GNC DUAL NAV ANTENNA INSTALLATION A COM Antenna NZ G S Antenna 1 2003 D w COM P2004 VOR LOC Antenna NAV ln G S Splitter ANT Diplexer VOR GNG RZ P2004 COM Antenna NAV oS P2003 COM oS Figure D 4 GTR GNC Antennas Interconnect Sheet 2 of 4 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 8 Rev B GARMIN SINGLE GNC OTHER RADIO AND SINGLE ANTENNA GNC VOR LOC GS Antenna P2004 4 CS A D 1 Splitter S VHF NAV RADIO WITH SEPARATE G S AND VOR LOC ANTENNA PORTS G S VOR LOC SINGLE GNC OTHER RADIO AND DUAL ANTENNAS G S Antenna GNC A G S 1 D ANT Diplexer Splitter S VOR 2 VOR LOC Antenna A VHF NAV RADIO WITH D SEPARATE G S AND Splitter VOR LOC ANTENNA 2 PORTS Figure D 4 GTR GNC Antennas Interconnect Sheet 3 of 4 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page D 9 A GARMIN NOTES N REFER TO SECTIONS 3 AND 4 FOR ANTENNA CABLE SPECIFICATIONS P2004 NAV ANTENNA PORT IS ONLY APPLICABLE TO THE GNC MODEL GARMIN P N 013 00112 00 MINI CIRCUITS SPLITTER P N ZFSC 2 1B MAY BE USED COMANT DIPLEXER P N CI 507 MAY BE USED THE DIPLEXER IS INSTALLED BACKWARDS FROM TRADITIONAL APPLICATIONS WHEN A G S AND VOR LOC ANTEN
31. REFERENCE ONLY REFER TO SECTION TBD FOR GNC CONFIGURATION SETTINGS THE GNC SHOULD BE CONFIGURED FOR PARALLEL 2X5 DME CHANNELING MODE FOR PROPER OPERATION WITH THIS MODEL OF DME TRANSCEIVER THE GNC SHOULD BE CONFIGURED FOR NARCO 890 891 DME CHANNELING MODE FOR PROPER OPERATION WITH THIS MODEL OF DME TRANSCEIVER DME 42 SHOULD BE STRAPPED FOR 2X5 TUNING REFER TO DME 42 INSTALLATION MANUAL FOR STRAPPING INFORMATION FOR DUAL GNC INTERFACES TO THE DME IT MAY BE NECESSARY TO INSTALL A TOGGLE SWITCH FOR THE DME COMMON INPUT INSTALL SWITCH AS SHOWN FOR KING SERIAL PANEL DME INTERCONNECT 8 Figure 0 11 Parallel 2 of 5 DME Tuning Interconnect Sheet 2 of 2 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page D 21 A GARMIN PARALLEL SLIP A BENDIX KING CODE TUNED DME KN 65 P651 PAR DME 1MHZ A PAR DME 1MHZ B PAR DME 1MHZ C PAR DME 1MHZ D SERIAL DME ON PAR DME 100KHZ A SERIAL DME HOLD PAR DME 100KHZ B PAR DME 100KHZ C PAR DME 100KHZ D PAR DME 50KHZ K50 N DME COMMON DME COMMON NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 REFER TO MANUFACTURER S DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT INFORMATION PINOUTS OF OTHER UNITS SHOWN FOR REFERENCE ONLY THE GNC SHOULD BE CONFIGURED TO OUTPUT SLIP CODE DME TUNING DATA FOR PROPER OPERATION IN THIS CONFIGURATION REFER TO SECTION 6 FOR CONFIGURATION SETTINGS FOR DUAL GNC INTERFACES THE DME IT
32. REMOTE TUNE DOWN COM REMOTE TUNE SWITCHES GNC CONNECTOR P2002 CDI HSI VORIILS LAT DEVIATION amp FLAGS VLOC AUDIO TO FROM VERT DEVIATION amp FLAGS VOR OBI SUPERFLAGS VOR OBS VLOC COMPOSITE OUT NAV ARINC 429 OUT NAV ILS ENERGIZE PARALLEL DME TUNING NAV DME COMMON SERIAL DME CLOCK DATA DME REQUEST COMMON SERIAL TUNED DME NAV REMOTE TRANSFER NAV REMOTE TRANSFER SWITCH GTR GNC CONNECTOR P2003 GNC CONNECTOR P2004 POWER amp GROUND COM ANTENNA NAV ANTENNA Figure D 1 GTR GNC System Interface Diagram GTR 225 GNC 255 TSO Installation Manual Page D 3 A GARMIN GTR GNC Typical Installation GTR GNC Navigation Indicator OUT _ HA VOR LOC RIGHT OUT lt gt A TO FLAG VOR LOC TO OUT E iih Y A NAV FLAG VOR LOC FLAG pian S El GLIDESLOPE UP N GLIDESLOPE FLAG e G S FLAG N VOR OBS ROTOR H GND A OBS RESOLVER H A N 2 HH ee J OBS RESOLVER E 5 VOR OBS STATOR A OBS RESOLVER F 666666 VOR OBS STATOR G GND wal OBS RESOLVER G AIRCRAFT POWER AVIONICS BUS AIRCRAFT POWER 2 28 AIRCRAFT GND AIRCRAFT 4A 14 VDC AIRCRAFT GND GROUND SWITCHES OPTIONAL VLOC REMOTE TRANSFER Audio Panel 500 VOR LOC AUDIO OUT HI NAV AUDIO IN HI 500 VOR LOC AUDIO OUT LO NAV AUDIO IN LO 500 COMAUDIO HI COM 1 AUDIO IN HI 500 COM AUDIO LO COM 1 AUDIO LO MIC AUDI
33. Rev B Page 5 15 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 5 16 Rev B GARMIN 6 POST INSTALLATION CONFIGURATION AND CHECKOUT PROCEDURES 6 1 System Configuration Overview This section contains instructions for configuring the GTR GNC for each installation as well as checks to ensure the system 15 properly installed and functioning correctly A summary of the steps required for configuration and checkout of the GTR GNC 1s as follows Perform the installation checks Section 6 5 Configure the GTR GNC for the specific installation Section 6 4 Perform ground checks to verify the interfaces to external sensors Section 6 6 Perform the specified flight checks Section 6 7 Update the aircraft documentation Section 6 9 6 2 Mounting Wiring and Power Checks Verify that all cables are properly secured and shields are connected to the shield block of the connectors Check the movement of the flight and engine controls to verify there 15 no interference between the cabling and control systems Ensure that all wiring is installed as described in Section 3 4 Prior to powering up the GTR GNC the wiring harness must be checked for proper connections to the aircraft systems and other avionics equipment Point to point continuity must be checked to expose any faults such as shorting to ground Any faults or discrepancies must be corrected before proceeding
34. UNIS ar 1 1 Table 1 2 GTR GNC Current oat GE 1 7 Table 1 3 TSO Authorization and Advisory Circular References 1 9 Table 1 4 1 9 Table 4 1 Catalog Part 4 1 Table 4 2 Standard Kt _________ _ 6___ 4 1 Table 4 3 Recommended Crimp Tools or Equivalent 4 3 Part 1 4 5 Table 6 1 Soral PON CC 6 3 Table 6 2 Intercom Enable Page Selections 24 rerit iaiia 6 4 Table 6 5 Backlight Selections usse a usen st ont Ur Coss 6 4 Table 6 4 Photocell Page Parameter Description i e iere trt eet one o eed uat eno pa de 6 5 Table 6 5 Lighting Bus Parameter Description rss rr rr RR RR rann rn nanna nan 6 6 Table 6 6 CDI Indicator Selections L LLULLU uu aaa sastikasaaqawauqqaypussasequskasqouskasaequwkaqysaasakeqaawai 6 7 Table 6 7 ARINC 429 Configuration Speed 6 8 Table 628 SDI eS C CHONG _ _______________ 6 8 T3ble 5 9 DME i DS u S 6 8 Table 010 _______________ 6 9 Taole ck accom 5 5 35
35. by the GTR GNC approximately once every second The track desired track and bearing to waypoint angles and the magnetic variation are output according to the current mode of the GTR GNC automatic magnetic heading magnetic variation computed at last known position true heading magnetic variation of E00 0 or user defined magnetic heading magnetic variation as entered by user Table B 1 describes the Type 1 output sentence item designator id and item data 4444 fields If data for these sentences 1s invalid or unavailable dashes are used to fill in all non blank character positions 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B 1 A GARMIN Table B 1 Aviation Output Sentence Format Data 10 bytes Description Ident 1 byte i 1234567890 6 Current latitude where 5 north or S south A dd degrees mm minutes hh hundredths of minutes add mmh A Current longitude where s E east or W west ddd degrees ka minutes hundredths of minutes ddddd Distance to waypoint in tenths of nautical miles NM Cross track error where G 5 L left R right of course nnnn error in hundredths of nautical miles Desired track in tenths of degrees Destination waypoint identifier will be blank filled on right if less than 5 characters in identifier Magnetic variation where E east or W west tenths of degrees q RR ST NAV valid f
36. communication installation of a second navigation and or communication system may be required 2 2 Aircraft Radio An aircraft radio station license 1 not required when operating in U S airspace but may be required when operating internationally As required by TSO C169a the quantitative safety objective for the VHF COM radio in GTR GNC 15 1 x 10 per flight hour for Class I Part 23 Airplanes and 1 x 10 per flight hour for all other Part 23 and Part 27 aircraft To meet requirements for Part 23 Class II Class III and Class IV and Part 27 aircraft it may be necessary to install a second VHF communications radio 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 2 1 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 2 2 Rev A A GARMIN 3 INSTALLATION OVERVIEW 3 1 Introduction Always follow acceptable avionics installation practices per AC 43 13 1B AC 43 13 2B or later FAA approved revisions of these documents The communications installation instructions have been prepared to meet the guidance material defined by AC 20 67B Airborne VHF Communications Equipment Installations 3 2 Antenna Considerations This section contains mounting location considerations for the antennas required for the GTR GNC For mounting the COM and NAV antennas refer to the aircraft manufacturer s data 3 2 1 COM Antenna Location The GTR GNC COM antenna
37. heads or other obstructions prevent the unit from fully engaging in the rack see the Connector Engagement Test Section 6 3 Exercise caution when installing the rack into the instrument panel Deformation of the rack may make it difficult to install and remove the GTR GNC unit 2 Install the rack in the aircraft panel using ten 6 32 flat head screws and ten self locking nuts The screws are inserted from the inside through the holes in the sides of the rack 3 attach the backplate to the rack align the backplate so that the backplate screw heads pass through the keyed holes in the back of the rack 4 Slide the backplate to the right viewing from cockpit until it clicks into place Secure the back plate by tightening the four 4 40 screws 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 4 5 GARMIN 4 7 2 GTR GNC Unit Insertion and Removal It may be necessary to insert the hex drive tool into the access hole and rotate the drive tool counterclockwise until 1t completely stops in order to ensure correct position of the retention mechanism prior to placing the unit in the rack The GTR GNC unit 1s installed in the rack by sliding it straight until it stops about 3 8 inch short of the final position A 3 32 inch hex drive tool is then inserted into the access hole at the bottom of the unit face Rotate the hex tool clockwise while pressing on the left side of the bezel until the unit is firmly seated in the
38. on P1004 are used to drive an indicator that displays VOR ILS information at all times regardless of the CDI selection on the GTR GNC VOR LOC COMPOSITE OUT is a standard VOR localizer composite output signal which may be used to drive Left Right To From and Flag indications of certain navigation indicators that contain an internal converter ILS ENERGIZE output becomes active low when VOR LOC frequency is set to a localizer channel 5 2 8 1 VOR ILS Indicator Electrical Characteristics 5 2 8 1 1 Superflags The output supplies not less than 320 mA with the output voltage not less than AIRCRAFT POWER 2 VDC when the flag 15 to be OUT OF VIEW The output voltage with respect to ground 15 0 250 mVDC when the Is to IN VIEW Connector Pin WO VORLOCSUPERRAG 5 GLIDESLOPE SUPERFLAG P2002 38 Out 5 2 8 1 2 Deviation Deviation outputs are each capable of driving up to three 10000 loads with 150 mVDC 15 mVDC for full scale deflection 0 mVDC 4 5 mVDC when centered The drive circuit provides for more than full scale deflection with a maximum course deviation voltage of 300 mVDC 30 m V DC Comedor Vomocagr 5 6 55 GLIDESLOPE DOWN 5 2 8 1 3 TO FROM TO FROM output is capable of driving up to three 2000 loads When indicating TO the output is 225 75 mV DC When indicating FROM output is 225 75 mVDC When in
39. rack To remove the unit from the rack insert the hex drive tool into the access hole on the unit face Rotate counterclockwise until the unit is forced out about 3 8 inch and the hex drive tool completely stops This will allow the unit to be freely pulled from the rack Be sure not to over tighten the unit into the rack The application of hex drive tool torque exceeding 15 in lbs can damage the locking mechanism 4 7 3 Unit Replacement Whenever the GTR GNC unit is removed or reinstalled verify that the unit powers up successfully 4 8 Antenna Installation and Connections 4 8 1 Antenna The GTR GNC unit requires a standard 50 Q vertically polarized antenna Follow the antenna manufacturer s installation instructions for mounting the antenna The antenna should be mounted on a metal surface or a ground plane with a minimum area of 18 inches x 18 inches Refer to Section 3 2 1 for installation location considerations The antenna coax cable should be made of RG 142B RG 400 or a comparable quality 50 coax Check for insertion loss and Voltage Standing Wave Ratio VSWR VSWR should be checked with an in line type VSWR wattmeter inserted in the coaxial transmission line between the transceiver and the antenna The VSWR should be inserted as close to the transceiver as possible When rack and harness buildup is performed in the shop the coax termination may be provisioned by using a 6 inch inline BNC connection This would be a
40. radiation convection and sometimes by direct conduction Even a single unit operates at a much higher temperature in still air than in moving air Fans or some other means of moving the air around electronic equipment are usually a worthwhile investment The GTR GNC has a cooling fan integrated into the chassis to draw forced air cooling through the unit There are inlets along the right side of the GTR GNC chassis that allow air to flow through the unit Ensure that there are no obstructions to the air inlets or fan exhausts Air should be able to freely flow from the chassis inlets to the fan outlet on the rear of the unit 3 6 Compass Safe Distance After reconfiguring the avionics in the cockpit panel if the GTR GNC unit is mounted less than 12 inches from the compass recalibrate the compass and make the necessary changes for noting correction data GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 3 4 Rev B GARMIN 4 INSTALLATION PROCEDURES 4 1 Unit and Accessories For description of units see Table 1 1 Table 4 1 Catalog Part Numbers Mode UnitOnly Kit Standard Kit Unit P N GTR 225 010 00998 00 010 00998 50 011 02718 00 225 010 01026 00 010 01026 50 011 02807 00 2258 010 01027 00 010 01027 50 011 02808 00 255 010 01025 00 010 01025 50 011 02806 00 010 00999 00 010 00999 50 011 02719 00 Table 4 2 Standard Kit Accessories Mode Part Number Connector Kit 011 02721 00
41. the start of message character and the end of message lt CR gt lt LF gt sequence is 25 bytes 1 Encoded hex each character consists of 4 bits of data placed in the low order nibble 30h For example the 8 bit value 5Fh would be encoded as two characters with values of 35h and 3Fh which map to the ASCII characters 5 and 2 respectively 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page B 5 A GARMIN B 2 3 Message Output Rate The GTR GNC will output the following messages at the specified rates B 2 4 B 2 4 1 CDI VDI and Flags at 10Hz high rate Decoded OBS Setting at 10Hz high rate Radial from Active VOR at 10Hz high rate Decoded Station Identifier at low rate NAV Receiver Status at 1Hz low rate COM Transceiver Status at 1Hz low rate Message Definitions Input Messages B 2 4 1 1 Request Data Output This input command is used to request an output message to be sent by the GTR GNC Message data may be specified There are a few important things to keep in mind The GTR GNC will flag the specified message for output when it receives the request There will be a lag between the time the message is flagged for output and the time it is actually output If another request for the same message Is received in this period then the previous request will be lost The amount of lag depends on the number of messages that are consecutively flagged for output Use o
42. through a list of preset COM frequencies A momentary low on this pin will load the previous preset frequency in the list into the standby COM frequency field 5 2 6 VOR ILS Audio 500 VOR LOC AUDIO OUT HI supplies 100 mW into a 5000 load It is a balanced output and the 500 VOR LOC AUDIO OUT LO Em must be connected Comedor Pin 0 VORILOG AUDIO ouri Out 500 O VOR LOC AUDIO OUT LO 5 2 7 VOR ILS Discrete Inputs This input 1s considered active if either the voltage to ground is lt 3 5 VDC or the resistance to ground is lt 375 This input is considered inactive if the voltage to ground is 11 33 VDC or the resistance to ground is gt 100 Pin Name Pim WO REMOTE TRANSFER P2002 In An asterisk following a signal name denotes that the signal is an Active Low requiring a ground to activate 5 2 7 1 VOR LOC REMOTE TRANSFER VOR LOC REMOTE TRANSFER discrete input may be used to flip flop between the active and standby NAV frequencies A momentary low on this pin will load the standby NAV frequency into the active NAV frequency field GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 5 10 Rev B GARMIN 5 2 8 VORIILS Indicator VORI ILS indicator displays both lateral and vertical To From indications lateral and vertical flags and superflags Connector P1004 always outputs the VOR Localizer Glideslope navigation information The VOR ILS pins
43. 0 to 975KHz in 50KHz steps or the even numbers from 30h to 56h TOP Reserved data in this field will be ignored Example message PGRMV28 P0 lt chksm gt lt CR gt lt LF gt This example command would set the standby VOR frequency to 111 800MHz This is interpreted by noting that the ASCII 2 corresponds with 3Fh 30h 6Fh converted to decimal equals 111 for the MHz portion The KHz portion converts ASCII to 50h 30h yields 20h x 25KHz steps 800KHz Note The GNC will check input frequencies for validity An RS 232 serial error message output will be generated if the frequency is invalid GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page B 10 Rev B GARMIN B 2 4 1 9 Set NAV Audio Mode This message is used to change the current NAV audio mode There are two possible settings for this mode The first is IDENT which will suppress the voice portion of the NAV audio signal and emphasize the Morse Code station identifier The second choice is VOICE which will emphasize voice signal and suppress the Morse Code station identifier unit will display ID in the upper left corner of the NAV page This message 15 available in both normal and test modes Message format gp S Message class This is a VHF NAV message p mr Message identifier PAE E NAV audio mode P IDENT V VOICE Example message PGRMV31I lt chksm gt lt CR gt lt LF gt Set the current NAV Audio mo
44. 0053 01 2 GTN GNC MOUNTING RACK GTR GNC MOUNTING RACK ASSEMBLY EXPLODED VIEW Figure C 2 GTR GNC Mounting Rack 190 01182 02 Rev GARMIN GNC255 UNIT ONLY 88 22 2 I L C ________________ ad eee eee 4 59 116 7 BACK FACE OF UNIT GNC255 UNIT AND INSTALL TRAY B6 88 22 8 22 2 TOP OF INSTALL TRAY TOP OF BEZEL BACK OF INSTALL TRAY 3 00 76 2 90 SIDE OF BEZEL 22 9 BEZEL 76 8 OUTSIDE OF INSTALL TRAY NOTES 1 DIMENSIONS ARE IN INCHES 2 DIMENSIONS ARE FOR REFERENCE ONLY Figure C 3 GNC Center of Gravity 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page C 5 A GARMIN GTR225 UNIT ONLY GTR225 UNIT AND INSTALL TRAY 70 74 18 3 118 8 TOP OF INSTALL TRAY BACK OF INSTALL TRAY 2 97 75 4 74 SIDE OF BEZEL 18 8 Rn 2 TOP OF BEZEL OUTSIDE OF INSTALL TRAY NOTES 1 DIMENSIONS ARE IN INCHES 2 DIMENSIONS ARE FOR REFERENCE ONLY Figure C 4 GTR Center of Gravity GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page C 6 Rev B GARMIN 4 460 REF 1 538 REF
45. 02 Page B 12 Rev B GARMIN B 2 4 2 2 COM Volume Level This message is used to output the COM volume level Message format Message class This is GTR GNC COM message Message ident uta Headphone Volume VU Sea Volume level 00 FFh use encoded hex 30h 3Fh Example message PGRMC02130 lt chksm gt lt CR gt lt LF gt The headphone volume level is 30h out of FFh 2 4 2 3 Software Version This message is used to output the COM module software version Message format uns nn Message class This is a GTR GNC COM message Message ident Software version In Example message PGRMC030100 lt chksm gt lt CR gt lt LF gt COM Software version is 01 00 2 4 2 4 GTR GNC COM Status This message is used to output the GTR GNC COM Status Message format PO Guns Message class This is GTR GNC COM message 12 S Message identifier COM needs service ASCII 0 OK 1 COM transmit capabilities not reliable COM status ASCII 0 OK 1 COM functions not available Push to Talk key stuck 0 OK 1 Stuck Remote Transfer stuck 0 1 Stuck n Remote Tune Up stuck 0 OK 1 Stuck Remote Tune Down stuck ASCII 0 OK I Stuck TX Power Limited ASCII 0 OK 1 Transmit power limited
46. 1 Figure 6 21 Download Log AOC m 6 12 Ireute 6 22 Clear Brror Logs Page 6 12 Figure 6 23 OBS Resolver Page 6 13 Figure 6 24 Test Analog Flags Page 2 8 6 14 Figure 623 DOSE DI VDLP E 6 14 Figure 6 20 USB Update 21057655 LLL ASA SEE E AER 6 21 Figure 6 27 Database Update Display 6 22 Figure 6 28 Verify Database Version 6 22 C LORS ONE DIMENSIONS uuu 3 Figure 2 GIR GNC Moun mng C 4 5 Figure TIS Center DE GIEOVIDV ______8 _6_ 6_ 6 Figure 5 GTR GNC Rear Connector Layout Detall 7 Pieire cin Rer IMP rM ULU 8 Figure Rack uuruuu u un u 2 C 9 Figure D 1 GTR GNC System Interface Diagram D 3 Figure D 2 GTR GNC Typical Installation D 4 Figure D 3 GTR GNC Power Lighting Configuration Interconnect
47. 182 02 Page B 14 Rev B 2 4 2 6 CDI VDI and A GARMIN Related Flags This message outputs the current values of the CDI VDI and their related flags Message format Example message Message class This is a GNC NAV message Message identifier CDI deflection An eight bit value indicating the amount of deflection of the CDI needle represented as two encoded hex digits The CDI deflection is a twos complement signed integer in the range of 120 to 120 100 indicates full left deflection 0 indicates no deflection and 100 indicates full right deflection 120 indicates max left right deflection VDI deflection An eight bit value indicating the amount of deflection of the VDI needle represented as two encoded hexcc CDI deflection An eight bit value indicating the amount of deflection of the CDI needle represented as two encoded hex digits The CDI deflection 15 a twos complement signed integer in the range of 120 to 120 100 indicates full left deflection 0 indicates no deflection and 100 indicates full right deflection 120 indicates max left right deflection digits The CDI deflection is a twos complement signed integer in the range of 120 to 120 100 indicates full deflection upwards 0 indicates no deflection and 100 indicates full deflection downwards 120 indicates max up down deflection Flags Eight bits for HNAV and VNAV related flags represented as two encoded hex digits Bit 1
48. 2 02 Page 2 Rev A GARMIN APPENDIX A ENVIRONMENTAL QUALIFICATION FORM For RTCA DO 160F Environmental Qualification Forms EQFs visit the Dealer Resource Center on Garmin s web site The EQF part number for the GTR Series GTR 225 225A 225B 1s 005 00658 02 The EQF part number for the GNC Series GNC 255A 255B is 005 00658 03 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page A 1 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page A 2 Rev A A GARMIN APPENDIX GTR GNC DATA FORMAT 1 RS 232 Aviation Data Format B 1 1 Electrical Interface The I O signals are compatible with RS 232C Data 15 generated at 9600 baud with a word length of 8 bits one stop bit and no parity B 1 2 General Aviation Output Format The GTR GNC RS 232 data has the following general format STX ASCII start of text character 02 hex tls Type 1 output sentences see following paragraphs for description t2s One or more type 2 output sentences see following paragraphs for description ETX ASCII end of text character 03 hex B 1 3 Aviation Output Sentence Type 1 The Type 1 output sentences have the following general format id item designator single ASCII alphabetic character dddd item data 1 to 10 printable ASCII characters CR ASCII carriage return character 0D hex LF ASCII line feed character OA hex Each Type 1 sentence is output
49. 2 4 2 1 Legacy NMEA Support The GTR GNC maintains backwards compatibility with legacy SL30 SL40 NMEA commands SPMMRC and as they apply to GTR GNC functionality Refer to Appendix 2 The following legacy SL30 40 input commands are supported as is Setactive COM frequency SL30 version only in 25 KHz spacing mode Setactive frequency and transceiver function SLAO version only in 25 KHz spacing mode Setstandby COM frequency SL30 version only in 25 KHz spacing mode Set standby frequency and transceiver function 51 40 version only in 25 KHz spacing mode Set Omni Bearing Select OBS value Select squelch test Squelch Override On Off The following legacy SL30 40 input commands are supported with modifications to fit the GTR GNC architecture Set active VOR LOC frequency Set monitor mode ignored Set standby VOR LOC frequency Set monitor mode ignored e Set NAV audio mode Cannot turn off NAV audio Set Volume Level and Audio Control Parameters Only headphone sidetone level and RF squelch supported e Request data output Cannot set speed Only unlisted command supported is Request Reset Status in both versions 5 2 4 2 2 NMEA GPS Data The following NMEA standard GPS messages are used by the GTR GNC for position source Geographic Position Latitude Longitude GPGLL Track Made Good and Ground Speed GPVTG 5 2 4 2 3 Input Commands The following input
50. 6 000000000000 6 2 DAT _________________ 6 3 64 2 NAV Configuration ONG Only 6 7 043 COM Configura INIM NET 6 9 EMEN 6 11 54 5 Tun HOPES 6 12 65 Ground Checks Configuration Mode LLL 6 13 GNCG Only 6 13 03 2 FlapsChecek GNC Only srera idere 6 14 0 5 3 VOR Localizer Glideslope Indicator GNC Only 6 14 654 Lish ns Bus Interface Check LIL S Ra a 6 15 6 6 Ground Checks Normal 6 16 6 06 1 Discrete Input Checkopt easi doni E aea 6 16 S lt 0 uuu aasan 6 16 6 6 3 Audio Check Audio Panel Installations GNC Only 6 16 289 au 6 17 Ji Bn cO gt LHP 6 18 OL 6 19 6 19 072 VOR Bhehnt Check GNC Only 6 19 O gt Check GNC ONIY 6 19 5 5 Loading 6 20 6 8 1 Creating a GTR GNC Software Loader USB Flash Drive
51. 69 14 01 M81969 14 01 Astro 615717 615725 M81969 1 04 NOTE Insertion extraction tools from ITT Cannon are all plastic others are plastic with metal tip 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 4 3 A GARMIN 4 6 Coaxial Cable Installation Follow the steps below for installation of the coaxial cables 1 Route the coaxial cable to the radio rack location keeping in mind the recommendations of Section 3 2 Secure the cable in accordance with AC 43 13 1B Chapter 11 section 11 2 Trim the coaxial cable to the desired length and install the TNC and BNC connectors per the cabling instructions on Figure 4 1 below If the connector is provided by the installer follow the connector manufacturer s instructions for cable preparation GASKET NUT 1 PLACE NUT AND GASKET OVER CABLE AND STRIP JACKET TO DIMENSION SHOWN 16 2 OUT BRAID DIELECTRIC DIMENSION SHOWN EE 3 PULL BRAID WIRES FORWARD AND TAPER TOWARD CENTER CONDUCTOR PLACE CLAMP OVER BRAID AND PUSH BACK AGAINST JACKET 4 FOLD BACK BRAID OVER CLAMP AS SHOWN TRIM OFF EXCESS BRAID SOLDER CONTACT TO CENTER CONDUCTOR 5 INSERT CABLE CLAMP AND GASKET INTO CONNECTOR BODY MAKING SURE THAT SHARP EDGE OF CLAMP SEATS PROPERLY AND TIGHTEN NUT Figure 4 1 Coaxial Cable Ins
52. 8 for description of the configuration speeds ARINC TEL db id a Ela LO SPEED P Figure 6 11 ARINC 429 Page Table 6 7 ARINC 429 Configuration Speed TX Selection Descrpion LO SPEED Standard low speed ARINC 429 nominally 12 5 kilobits per second HI SPEED High speed ARINC 429 nominally 100 kilobits per second Table 6 8 SDI Selections Selection Description _ COMMON Generates all 429 outputs with SDI 0 Number 1 Pilot VOR ILS Receiver VORIILS 1 TX Generates all 429 outputs with SDI 1 Number 2 Copilot VOR ILS Receiver TX Generates all 429 outputs with SDI 2 For use with serial Electronic Flight Instruments EFIS conforming to the Garmin Serial Data Specification See Appendix B 6 4 2 3 Configuration Only Select the configuration page to configure the channel mode settings 6 4 2 3 1 Mode DME Channel Mode This configuration setting allows the Installer to set the format for DME tuning data output See Table 6 9 for DME settings VOR ILS 2 SERIAL Table 6 9 DME Settings Selection Description 0000025 King Serial King Serial DME tuning data Parallel 2x5 2 015 parallel DME tuning Parallel BCD Shifted BCD Binary Coded Decimal parallel DME tuning Parallel Slip Slip code parallel DME tuning 2 of 5 parallel DME tuning compatible with the following Narco DME units Narco 890 891 DME 890
53. AUTIONS AND NOTES WARNING Warnings are used to bring to the installer s immediate attention that personal injury or death may occur if the instruction is disregarded N CAUTION Cautions are used to alert the individual that damage to equipment may result if the procedural step is not followed to the letter Notes are used to expand and explain the preceding step and provide further understanding of the reason for the particular operation 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page i A GARMIN A GTR 225 GNC 255 TSO Installation Manual Page ii WARNING This product its packaging and its components contain chemicals known to the State of California to cause cancer birth defects or reproductive harm This notice is being provided in accordance with California s Proposition 65 If you have any questions or would like additional information please refer to our web site at www prop 3 WARNING Perchlorate Material special handling may apply see www dtsc ca gov hazardouswaste perchlorate WARNING This product contains a lithium battery that must be recycled or disposed of properly Battery replacement and removal must be performed by professional services CAUTION To avoid damage to the GTR 225 or GNC 255 take precautions to prevent Electro Static Discharge ESD when handling the GTR connectors fan and associated wiring ESD damage can
54. D 6 Figure D 4 GTR GNC Antennas Interconnect D 7 Figure D 5 GTR GNC Audio Panel Interconnect D 11 Figure D 6 GTR GNC MIC Interconnect a nnne D 13 Figure GIBR GNCO InfeteOlflGGE 5 NONIS PEDI IKE H RUP D 14 Figure D 8 GTR GNC Switches Interconnect D 16 Feur D 9 RMT OBT IOETCONDECI uu ied ua shiuq D 17 Figure D 10 GNC King Serial DME Remote Mount Interconnect D 18 Figure D 11 Parallel 2 of 5 DME Tuning Interconnect 200 2 21212420000000000000000000000000020022081 D 20 Figure D 12 Parallel Slip Code DME Tuning Interconnect D 22 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page vi Rev B Figure D 13 GNC King Serial DME Panel Mount Interconnect D 23 Figure D 14 GTR GNC GDU 620 IMtercOnne ct Ll l tasta D 25 Figure D 15 GTR GNC GTN GNS 400W 500W D 26 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page vil GARMIN A GARMIN List of Tables Table ded
55. D PER THE REMOTE EQUIPMENT INSTALLATION REQUIREMENTS 4 REFER TO GARMIN GDU 620 DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT INFORMATION N GDU 620 GPS POSITION FORWARDING TO GTR GNC IS NOT SUPPORTED IN SOME VERSIONS OF GDU 620 SOFTWARE SO IT MAY BE PREFERABLE TO UTILIZE THE ARINC 429 INTERFACE TO ALLOW THE RS 232 PORT TO BE USED FORA GPS SOURCE CONFIGURE THE GDU 620 TO USE AN RS 232 NAV RADIO SUCHAS AN SL30 REFER TO THE GDU 620 INSTALLATION MANUAL FOR RS 232 CONFIGURATION DETAILS A SELECTED COURSE INPUT TO THE GNC IS NOT PROVIDED BY THE GDU 620 IN THIS CONFIGURATION CONFIGURE THE GNC CDI INDICATOR TYPE TO NONE THE GNC WILL SEND NAVIGATION DATA TO THE GDU 620 OVER ARINC 429 WHICH ALLOWS THE GNC RS 232 INPUT TO BE USED FOR A GPS SOURCE SEE GDU 620 INSTALLATION MANUAL 190 00601 04 FOR NAV INPUT OPTIONS AND CONFIGURATION N CONFIGURE THE GDU 620 TO USE AN ARINC 429 NAV RADIO OTHER ARINC 429 PORTS MAY BE USED ON THE GDU 620 Figure D 14 GTR GNC GDU 620 Interconnect 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page D 25 A GARMIN GARMIN GTN 6XX 7XX RS 232 IN RS 232 OUT GARMIN GTR GNC P4001 GNS 400W 500W RS 232 IN AV 58 RS 232 OUT 2 RS 232 OUT 59 RS 232 IN 2 NOTES 1 2 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED GROUND DESIGNATIONS SHIELD BLOCK GROUND AIRFRAME GROUND AT GTR GNC CONNECT SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SH
56. ENT LOM UPDATE Figure 6 17 Software Update Refer to Section 6 8 for Instructions on loading COM software to the GTR GNC GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 6 10 Rev B A GARMIN 6 4 4 Audio Configuration 6 4 4 1 COM Sidetone The COM Sidetone page Figure 6 18 allows the installer to adjust the COM sidetone volume COM sidetone is the audio spoken into the COM microphone This setting only affects the volume of the sidetone for the GTR GNC COM during PTT To adjust the COM sidetone volume rotate the smaller inner knob to the desired value This field is adjustable in the range of 0 zero to 100 The default is 50 COM SIDETONE UOLUHE RR Figure 6 18 COM Sidetone Page 6 4 4 2 Mix NAV Audio The Mix NAV Audio page Figure 6 19 allows the installer to configure whether NAV audio is mixed with the COM headphones With this option set to On the NAV audio will be sent along with COM audio to the pilot s headphones and the audio will be mixed With this option set to Off the NA V audio will not be heard in the pilot s headphones The NAV audio will still be sent over the analog audio lines on P2002 16 and 17 In installations with an audio panel this should be set to Off Use the smaller inner knob to select On or Off Press ENT when the appropriate selection 15 displayed Mix HAY AUDIO MIXED WITH Figure 6 19 Mix NAV Aud
57. GNC owner accepts all responsibility for obtaining the proper licensing before using the transceiver The maximum transmitting power modulation identification and frequency band information may be required for licensing and are detailed in Section 1 4 4 Ay CAUTION The VHF transmitter in this equipment is guaranteed to meet Federal Communications Commission acceptance over the operating temperature range Modifications not expressly approved by Garmin could invalidate the license and make it unlawful to operate the equipment GTR 225 GNC 255 TSO Installation Manual 190 01 182 02 Page 1 8 Rev B A GARMIN 1 5 Regulatory Compliance Table 1 3 TSO Authorization and Advisory Circular References TSO ETSO Function SAE RTCA EUROCAE TSO C34e DO 192 ETSO 2C34f ED 47B TSO C36e 00 195 ILS Localizer ETSO 2C36f ED 46B TSO C40c DO 196 VOR ETSO2C40c ED 22B TSO C128a DO 207 ETSO 2C128 ED 67 TSO C169a DO 186B 006 B1061 05 thru O ETSO 2C169a H1 H2 006 B1374 03 thru 0 ED 23C Applicable CLD Applicable SW P Ns P Ns 006 B0082 12 thru 1 ILS Glideslope 006 B1374 03 thru 0 006 C0124 01 thru 0 006 B0082 12 thru 1 006 B1374 03 thru 0 006 C0124 01 thru 0 006 B0082 12 thru 1 et LO CN N x Equipment That Prevent Blocked Channels 006 B1061 05 thru 0 006 B1374 03 thru 0 O 006 C0135 23 thru 2
58. IELD TERMINATION LEADS SHOULD BE LESS THAN 3 0 CONNECT OTHER END OF THE SHIELD PER THE REMOTE EQUIPMENT INSTALLATION REQUIREMENTS REFER TO GARMIN INSTALLATION DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT INFORMATION Figure 0 15 GTR GNC GTN and GNS 400W 500W GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 26 Rev B
59. IN Table 1 2 GTR GNC Current Specifications LRU 14 Volt Current Draw 28 Volt Current Draw Typical Maximum GTR 225 Connector 959A DZA GTR 225A Connector 059A X287 GTR 225B GNC 255A 2558 1 The specified current draw is with the display backlight set to 100 and the fan operating If the superflags are connected their current draw must be added in addition to the specified current 2 The specified current draw does not include the superflags If connected their current draw must be added to the specified current The superflags will supply up to 320 ma each regardless of the input voltage 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 1 7 A GARMIN 1 4 License Requirements The Telecommunications Act of 1996 effective February 8 1996 provides the FCC discretion to eliminate radio station license requirements for aircraft and ships GTR GNC installations must comply with current transmitter licensing requirements In the US to find out the specific details on whether a particular installation is exempt from licensing please visit the FCC web site http wireless fcc gov aviation If an aircraft license is required make application for a license on FCC form 404 Application for Aircraft Radio Station License The FCC also has a fax on demand service to provide forms by fax Outside the US contact the responsible telecommunication authority The GTR
60. ION 11 Introduction This manual 15 intended to provide mechanical and electrical information for use in the planning and design of an installation of the GTR 225 GTR 225A GTR 2258 GNC 255A or GNC 2558 into an aircraft This manual is not a substitute for an approved airframe specific maintenance manual installation design drawing or complete installation data package Attempting to install equipment by reference to this manual alone and without first planning or designing an installation specific to your aircraft may compromise your safety and is not recommended The content of this manual assumes use by competent and qualified avionics engineering personnel and or avionics installation specialists using standard aviation maintenance practices in accordance with Title 14 of the Code of Federal Regulations and other relevant accepted practices This manual is not intended for use by individuals who do not possess the competencies and abilities set forth above Refer to Section 2 Limitations for additional information and other considerations 1 2 Equipment Description Table 1 1 TSO Certified Units TX Power 8 33 KHz 25 KHz aN CAUTION The GTR GNC units have a display that is coated with a special anti reflective coating that is very sensitive to waxes and abrasive cleaners CLEANERS CONTAINING AMMONIA WILL HARM THE ANTI REFLECTIVE COATING It is very important to clean the display using a clean lint free cloth and an eyeglass lens clean
61. If the brightness level the GTR GNC display does not increase as the lighting is increased in brightness verify that the wiring is correct before proceeding The display and bezel key backlighting on the GTR GNC can track an external lighting dimmer bus input and use it to vary the display and bezel key backlight levels accordingly This check verifies that the interface is connected correctly Ensure the lighting bus 15 set to its minimum setting 2 Slowly vary the lighting bus level that is connected to the GTR GNC Verify that the display brightness tracks the lighting bus setting Continue to maximum brightness and verify proper operation 190 01 182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 15 GARMIN 6 6 Ground Checks Normal Mode 6 6 1 Discrete Input Checkout Table 6 11 Discrete Input Pins Pin 2001 12 INTERCOM ENABLE Enables the intercom function on the GTR GNC P2001 27 COM REMOTE TRANSFER Flip flops the active and standby COM frequencies P2001 28 COM REMOTE TUNE UP Scrolls up through the preset COM frequencies in the standby frequency field P2001 29 COM REMOTE TUNE DOWN Scrolls down through the preset COM frequencies in the standby frequency field P2002 28 VLOCK REMOTE TRANSFER Flip flops the active and standby NAV frequencies If a switch is connected to any pins listed in Table 6 11 perform the following procedure 1 For each of the switches that are con
62. NA IS INSTALLED IT IS REQUIRED TO JOIN THE SIGNALS OF BOTH ANTENNAS WITH THE 507 PPP DIPLEXER Figure D 4 GTR GNC Antennas Interconnect Sheet 4 of 4 GTR 225 GNC 255 TSO Installation Manual 190 01 182 02 Page D 10 Rev B A GARMIN OIGNV Z AVN L AVN GND AVN L AVN L d AIN INOO L A3M AIN Z INOO L WOO H O 07 82 A d AVN 02 2 02 2 OIN WOOD OIGNY DIN Z INOO L WOO aye H d 6E ZE H d H d IH NI OIGNYV SIN WOO IH OIGNY Z WOO L WOO 01 6 OL 6 21 6 21 6 IH WOOD 00S WOLLO P WOLLOS WOLLO LOGE IF INOLLOS 0002 VINd OSE SE VIND samas st 15 0009 VINd 0008 YNd 275 VIND 631836 0116 ONDI XION38 ONIH33NION3 Sd ON59 H I9 TANVd Olanv LOANNOOYALNI 13NVd Olanv Page D 11 GTR 225 GNC 255 TSO Installation Manual Figure D 5 GTR GNC Audio Panel Interconnect Sheet 1 of 2 190 01182 02 Rev B A GARMIN NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS 5 SHIELD BLOCK GROUND AIRFRAME GROUND AN THE 500 OHM AUDIO OUTPUTS ARE BALANCED OUTPUTS AND THE LO OUTPUTS NEED TO BE CONNECTED IF THE AUDIO PANEL DOES N
63. NCY TO THE ACTIVE COM FREQUENCY VIA REMOTE SWITCH MAY OPTIONALLY USE GRAYHILL SWITCH P N 30 3 COM REMOTE TUNE AND COM REMOTE TUNE DOWN CAN BE USED TO SCROLL THROUGH A LIST OF PRESET COM FREQUENCIES MAY OPTIONALLY USE TWO GRAYHILL SWITCHES P N 30 3 ALTERNATIVELY AN ON OFF ON SWITCH CARLINGSWITCH P N 62012481 0 0 CAN BE USED THE INTERCOM ON OFF SWITCH IS AN OPTIONAL SWITCH THAT MAY BE INSTALLED TO ENABLE DISABLE THE GTR GNC INTERCOM FUNCTION ALTERNATELY THE INTERCOM MAY BE ENABLED DISABLED VIA THE FUNCTION MENU OPTIONS ON THE GTR GNC MAY OPTIONALLY USE GRAYHILL SWITCH P N 30 3 VLOC REMOTE TRANSFER CAN BE USED TO TRANSFER THE STANDBY NAV FREQUENCY TO THE ACTIVE NAV FREQUENCY VIA REMOTE SWITCH MAY OPTIONALLY USE GRAYHILL SWITCH P N 30 3 gt gt Figure 0 8 GTR GNC Switches Interconnect GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 16 Rev B GARMIN TYPICAL CONNECTIONS TO RMI RADIO MAGNETIC INDICATOR BENDIX KING KNI 582 KNI 582 KDA 692 Pointer 1 Pointer 2 P6921 P5821 P5821 VOR OBI CLOCK 25 OBI CLOCK VOR OBI DATA 27 OBI DATA OBI SYNC 26 OBI SYNC NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS 5 SHIELD BLOCK GROUND AIRFRAME GROUND 3 AT GNC CONNECT SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SHIELD TERMINATION LEADS SHOULD BE LESS THAN 3 0 CONNECT OTHER END OF THE SHIELD PER THE REMOTE EQUIPMEN
64. O IN LO COM MIC 1 AUDIO IN HI COM MIC 1 KEY COM REMOTE TUNE UP ALERT 2 AUDIO IN LO COM 1 MIC AUDIO OUT HI COM 1 MIC KEY OUT COM REMOTE TUNE DOWN SWITCHES OPTIONAL GPS Source COM REMOTE TRANSFER A I J RS 232 GND AIRCRAFT POWER sS AVIONICS BUS AIRCRAFT POWER 5A 28 VDC AIRCRAFT POWER 10A 14 VDC AIRCRAFT GND AIRCRAFT AIRCRAFT GND L GROUND AIRCRAFT GND V COM ANTENNA D COM ANTENNA w NAV ANTENNA P2004 D NAV ANTENNA ER Figure D 2 GTR GNC Typical Installation Sheet 1 of 2 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 4 Rev B GARMIN NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS WY SHIELD BLOCK GROUND AIRFRAME GROUND 3 AT THE GTR GNC CONNECT SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SHIELD TERMINATION LE BE LESS THAN 3 0 CONNECT OTHER END OF THE SHIELD PER THE REMOTE EQUIPMENT INSTALLATION REQUIRI 4 REFER TO FIGURE D 3 FOR POWER AND GROUND WIRING DETAILS Figure D 2 GTR GNC Typical Installation Sheet 2 of 2 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page D 5 A GARMIN GTR GNC AIRCRAFT POWER AIRCRAFT POWER AIRCRAFT POWER A AIRCRAFT GND AIRCRAFT GND AIRCRAFT GND LIGHTING BUS 1 HI LIGHTING BUS 1 LO LIGHTING BUS 2 HI LIGHTING BUS 2 LO RS 232 IN AIRCRAFT POWER 2 AIRCRAFT POWER AIRCRAFT GND AIRCRAFT GND NOTES P2002 51 52 Le 61 62 s
65. OCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT INFORMATION PINOUTS OF OTHER UNITS SHOWN FOR REFERENCE ONLY 5 THE GNC MAY BE CONFIGURED AT INSTALLATION TO OUTPUT KING SERIAL DME TUNING DATA UNDER THE DME CHANNEL MODE REFER TO SECTION TBD FOR CONFIGURATION SETTINGS A N THE NAV SELECTION SWITCH IS ONLY REQUIRED IF TWO GNCS ARE INSTALLED FOR SINGLE GNC INSTALLATIONS WIRE AS SHOWN FOR GNC 1 AN ACCEPTABLE SWITCH IS CARLINGSWITCH P N 112 A 63 LABEL AS SHOWN REFER TO SECTION TBD FOR ADDITIONAL SWITCH INSTALLATION INFORMATION Figure D 13 GNC King Serial DME Panel Mount Interconnect Sheet 2 of 2 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 24 Rev B GARMIN FOR GNC GDU 620 INSTALLATIONS USING RS 232 N GTR GNC GARMIN GDU 620 RS 232 IN ii RS 232 OUT 5 RS 232 OUT RS 232 IN 5 RS 232 GROUND 5 FOR GNC GDU 620 INSTALLATIONS USING ARINC 429 GTR GNC P2001 GPS SOURCE RS 232 IN 16 RS 232 OUT 5 232 OUT 1 RS 232 IN RS 232 GND 31 RS 232 GROUND pado GARMIN GDU 620 P6202 A 7 ARINC 429 IN 4A J gt 24 ARINC 429 IN 4B ARINC 429 OUTA 24 rf ARINC 429 OUT B 23 7 Ny NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS SHIELD BLOCK GROUND AIRFRAME GROUND 3 AT GTR GNC CONNECT SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SHIELD TERMINATION LEADS SHOULD BE LESS THAN 3 0 CONNECT OTHER END OF THE SHIEL
66. ONNECT DIAGRAMS D 1 Drawing List The following drawings are included in this section Figure D 1 GTR GNC System Interface Diagram Figure D 2 GTR GNC Typical Installation Figure D 3 GTR GNC Power Lighting Configuration Interconnect Figure D 4 GTR GNC Antennas Interconnect Figure D 5 GTR GNC Audio Panel Interconnect Figure D 6 GTR GNC MIC Interconnect Figure D 7 GTR GNC VOR ILS Interconnect Figure D 8 GTR GNC Switches Interconnect Figure D 9 RMI OBI Interconnect Figure D 10 GNC King Serial DME Remote Mount Interconnect Figure D 11 Parallel 2 of 5 DME Tuning Interconnect Figure D 12 Parallel Slip Code DME Tuning Interconnect Figure D 13 GNC King Serial DME Panel Mount Interconnect Figure D 14 GTR GNC GDU 620 Interconnect Figure D 15 GTR GNC GTN and GNS 400W 500W OOO 0 0 0 190 01182 02 225 GNC 255 TSO Installation Manual Rev B D 1 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 2 Rev A AIRCRAFT POWER amp GROUND AIRCRAFT LIGHTING BUS AUDIO PANEL ARINC 429 EFIS EHSI PARALLEL TUNED DME AIRCRAFT POWER amp GROUND 190 01182 02 Rev B GARMIN GTR GNC CONNECTOR P2001 POWER amp GROUND LIGHTING BUS RS 232 IN GPS SOURCE COM MIC KEY COM MIC AUDIO MICROPHONE COM MIC AUDIO COM REMOTE TRANSFER COM REMOTE TRANSFER COM AUDIO SWITCH COM REMOTE TUNE UP COM
67. OT HAVE A LO INPUT THE LO OUTPUT SHOULD BE CONNECTED TO A GROUND LUG AT THE AUDIO PANEL 4 REFER TO MANUFACTURER S DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT INFORMATION PINOUTS OF OTHER UNITS SHOWN FOR REFERENCE ONLY A N SHIELDS FOR AUDIO CABLES SHOULD BE GROUNDED AT ONE END WITH LEADS LESS THAN 3 0 INCHES AND LEFT FLOATING AT THE OTHER END IF SHIELDED AUDIO CABLE IS CARRIED THROUGH A DISCONNECT CARRY THE SHIELD GROUND THROUGH THE DISCONNECT ON A SEPARATE PIN CONNECTING TWO MICROPHONES TO MIC AUDIO HI LO AT THE SAME TIME MAY RESULT IN WEAK OR DISTORTED AUDIO MIC ISOLATION RELAYS ARE RECOMMENDED SO THAT ONLY ONE MIC IS ACTIVE AT A TIME AN SPLICE 5000 COM AUDIO LO AND MIC AUDIO IN LO TOGETHER INTO THE SAME PIN ON AUDIO PANEL THE P2002 NAV CONNECTOR IS ONLY APPLICABLE TO THE GNC MODEL Figure D 5 GTR GNC Audio Panel Interconnect Sheet 2 of 2 225 GNC 255 TSO Installation Manual 190 01182 02 Page D 12 Rev B GARMIN GTR GNC P2001 SPEAKER AUDIO OUT HI A a SPEAKER AUDIO OUT LO 39 COCKPIT MIC JACK 1 KEY e A COM MIC 1 AUDIO IN HI MIC AUDIO IN LO g NS MIC JACK COM MIC 2 KEY A a Oz ebtf7fsfffrfSP7SPSRT T OPDTT RBSS r I r ETt TT COM MIC 2 AUDIO HI COPILOT PTT Ee S 500 OHM COM AUDIO HI r PILOT HEADSET 500 OHM COM AUDIO 5 ON HEADSET IN
68. T INSTALLATION REQUIREMENTS IF NO SHIELD TERMINATION REQUIREMENT EXISTS FOR THE REMOTE EQUIPMENT TERMINATE SHIELDS AS SHORT AS POSSIBLE NOT TO EXCEED 3 0 SEE SECTION lt TBD gt 4 REFER TO MANUFACTURER S DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT CONFIGURATION INFORMATION PINOUTS OF OTHER UNITS SHOWN FOR REFERENCE ONLY Figure D 9 RMI OBI Interconnect 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 0 17 194145 Lid 09 118 OL NOWWOD c AVN AWC AVN NOIINOO AVN 1S30n038 AVN TVIH3S M00 19 VIVG AWd 7145 snd viva 320 Io73ING 1585 1S30n038M ANA L Z Sd 7 6 ZZS CH OND SHO LVOIGNI SING NOMNWINOO AVN ISANOAY TVIH3S snd viva 7195 M20 19 320 Io7 3ING 1885 L ONO ALOWSAY A GARMIN GALNNOW 3SLOWAY SING 1VI3S 190 01182 02 Rev Figure D 10 GNC King Serial DME Remote Mount Interconnect Sheet 1 of 2 GTR 225 GNC 255 TSO Installation Manual Page D 18 GARMIN NOTES 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS 5 SHIELD BLOCK GROUND AIRFRAME GROUND 3 AT GNC CONNECT SHIELD GROUNDS TO THE CONNECTOR BACKSHELL THE SHIELD TERMINATION LEADS SHOULD BE LESS THAN 3 0 4 REFER TO MANUFACTURER S DOCUMENTATION FOR COMPLETE PINOUT AND INTERCONNECT
69. TERCOM ENABLE O M O O INTERCOM SELECTOR OFF SWITCH OPTIONAL AUX Audio Source i e music DME AUX AUDIO LINE LEVEL HI m AUDIO OUT HI AUX AUDIO LINE LEVEL GND J AUDIO OUT LO 5 1 ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE SPECIFIED 2 GROUND DESIGNATIONS SHIELD BLOCK GROUND AIRFRAME GROUND BN THE INTERCOM ON OFF SWITCH IS AN OPTIONAL SWITCH THAT MAY BE INSTALLED TO ENABLE DISABLE THE GTR GNC INTERCOM FUNCTION ALTERNATELY THE INTERCOM MAY BE ENABLED DISABLED VIA THE FUNCTION MENU OPTIONS ON THE GTR GNC Figure D 6 GTR GNC MIC Interconnect 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page D 13 O1NIS 9 580 IH NIS 4 580 01502 3 S80 IH SOO 580 S80 S80 SV 14 3dO 1Sdaql 19 9V 1d 5 NMOd AZIDYANS 51 ALISOdWOD 2OT HOA OV 14 AVN SV d4 AVN 1 1 1451 YOLVOICNI NOILVOIAVN GARMIN 9 9 G G 9 9 vl el 8 8 2 Z 0 0 6 6 cl Cl Lb LL LY6OZd LV80 d 160 L80Zd L90Zd LEOZd Id veoz 800414 60414 802b 902 IM 702 IM 202 IM 20414 1901 19 201 19 ONPA XION 39 ZX 5 E gt TN gt 9 9 HOLVLS 580 HOA 3 YOLVLS 580 IN9 3 15 580 HOA YOLVLS 580 HOA I 580 HOA GND H SEO HOA 9V I4 5 9V I3
70. V page The second choice is VOICE which will emphasize voice signal and suppress the Morse Code station identifier Message format ub i Message class This is a VHF NAV message p Message identifier P NAV audio mode IDENT V VOICE Example message S PGRMV291 lt chksm gt lt CR gt lt LF gt The current NAV Audio mode is IDENT B 2 4 2 13 NAV Volume Level This message is used to output the NAV volume level Message format e ener ren een renee Message class This is a GNC NAV message 2i Message ident o Volume level 00 FFh use encoded hex 30h 3Fh Example message PGRMV4030 lt chksm gt lt CR gt lt LF gt The headphone volume level 15 out of FFh GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page B 18 Rev B GARMIN Table B 3 Input Message Summary ident Description Response Comment Set Active COM Frequency and om C Transceiver Transceiver Function Status Set Standby COM Frequency SOM C 01 Transceiver and Transceiver Function Status COM Audio C 02 Set COM Audio Items Status GTR GNC COM Status GNC NAV Request Data Output Set Active VOR LOC Frequency NAV Receiver 27 mo and Receiver Function Status Request COM data Set Standby VOR LOC y NAV Receiver Frequency and Receiver Status Function Set NAV Audio Mode NAV Audio Mode sa
71. VAL cuocere n et ipo OEE R 4 6 552 4 6 4 8 Antenna Installation and Connections 4 6 A UIN 4 6 5 CONNECTOR PINOUT INFORMATION 5 1 I Om 5 1 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev ili A GARMIN 54 1 P2001 Connector Board iunii ne EENE E PERESS 5 1 24 2 P2002 Connector NAV ENE IMMUNDA EEA 5 3 52 Power Lighting And ANTENNAS 5 5 SPP _______________ ___ 6_ _ ___ 5 5 922 lp 5 6 NA a UU TU m 5 6 SU 5 6 323 IMPUS RR 5 9 920 5 10 Sr IMPUS E 5 10 35 WIR i 5 11 N RUS sss 5 13 DME T i 5 14 6 POST INSTALLATION CONFIGURATION AND CHECKOUT PROCEDURES 6 1 6 1 System Configuration Overview eda idque 6 1 6 2 Mounting Wiring and Power Checks 6 1 6 3 Connector Engagement Check 6 2 6 4 Configuration Mode Operations 2 2 2 20 220000060
72. Verify the Morse code decoder IDs the station 95 probability 4 Fly to and from the station 5 Verify NAV flag TO FROM flag and CDI are operational It may be required by the governing regulatory agency to verify operation of the VOR receiver at the extents of a ground facility s service volume e g FAA AC 23 8A 6 7 3 ILS Flight Check GNC Only 1 Tune an ILS local airport 2 Verify the audio IDENT and audio quality and verify that no objectionable electrical interference such as magneto noise 1 present 3 Verify the Morse code decoder IDs the station 95 probability Fly the approach 5 Verify NAV flag GS flag and CDI and VDI are operational 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 19 A GARMIN 6 8 Software Loading The GTR GNC comes pre loaded with software However if the software is out of date it is recommended that current software from a USB 2 0 zip drive be loaded into the GTR GNC For dual GTR GNC installations the software loading procedures must be carried out on both units 6 8 1 Creating a GTR GNC Software Loader USB Flash Drive A NOTE Note The application to create a loader card requires Windows 2000 XP Vista or Windows 7 There is no Mac support at this time 1 Goto the Dealer Resource Center Garmin s web site 2 Download the GTR GNC System software to your PC 3 Ensure that you have a USB 2 0 compatible USB drive connected to the PC in th
73. adjacent pins prior to applying power to the unit including the lighting bus x PiNam Pin TO rr LIGHTING LO 4 P2001 LIGHTING LO 2 P2001 5 2 3 Antennas The COM and NAV antennas use BNC coaxial connectors on the connector backplate i0 2003 NAV 2004 0m 5 2 4 Serial Data RS 232 x Cemmeder Pin TO 1 P 3 m 5 241 Aviation Out 1 and 2 Format The GTR GNC is capable of interfacing with other aviation instruments by receiving Aviation Out Type 2 data on RS 232 Input Port 1 The data consists of the following refer to Section B 1 for a detailed data format description e Current latitude longitude and GPS altitude in feet see note below e Current velocity vector ground speed and direction of velocity vector over the ground Distance to waypoint Cross track error Desired track e Destination waypoint identifier Bearing to destination waypoint Magnetic variation e Navigation and warning status Waypoint sequence in route Waypoint position latitude and longitude and magnetic variation NOTE Aviation RS 232 data may be transmitted with or without the current GPS altitude in feet Refer to Appendix B GTR 225 GNC 255 TSO Installation Manual 190 01 182 02 Page 5 6 Rev B A GARMIN 5 2 4 2 NMEA Format 5
74. an 1 0 V when sinking 20 mA The maximum off state leakage current with respect to GND 15 less than 10 uA Connector Pin TO GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 5 12 Rev B GARMIN 529 RMI OBI 5 2 9 1 RMI OBI Function VOR OBI output provides bearing information from the currently tuned VOR station for Bendix King Serial OBI devices based upon the VOR receiver When a localizer channel is tuned on the VOR LOC window there is a bit in the data stream set to indicate that a localizer frequency is tuned which stows the needle or drives it to the 3 o clock position 5 2 9 2 RMI OBI Electrical Characteristics The output driver is an Active Low The driver output voltage is not more than 1 0 V when sinking 20 mA The maximum off state Anca current with respect to ground is less than 10 Connector Pin 0 2 voise 27 VOR OBI DATA 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 5 13 A GARMIN 5 2 10 DME Tuning 5 2 10 1 DME Tuning Function The GTR GNC can channel a DME based on the tuned VOR LOC frequency The GTR GNC 2 of 5 BCD or Slip parallel DME and King Serial DME channeling format When DME COMMON 1s held low the GTR GNC actively tunes the DME 5 2 10 2 DME Tuning Electrical Characteristics 5 2 10 2 1 Parallel DME Tuning For each of the parallel DME tuning discrete outputs the driver output voltage is not more
75. be prevented by touching an object that is of the same electrical potential as the unit before handling the unit itself NOTE Garmin recommends installation of the GTR 225 GNC 255 by a Garmin authorized installer To the extent allowable by law Garmin will not be liable for damages resulting from improper or negligent installation of the GTR 225 GNC 255 For questions please contact Garmin Aviation Product Support at 888 606 5482 190 01182 02 Rev B GARMIN TABLE OF CONTENTS GENERAL DESC RP 1 1 y li DNE 1 1 2 Desoription Lu 1 1 13 Tecin I CE E au EMI M 1 2 131 Physical Characteristics Lu 1 2 13 2 1 2 1 3 L34 1 3 i MR 1 4 COC 1 5 Glideslop DEI LIC 1 6 1 8 15 Repg lalory G mplianeer uy 1 9 L51 Nom SIC m 1 9 152 T ODE v 1 10 1 5 3 FCC Grant of Equipment Authorization nnn nenne nnne enne nens 1 10 ua uu 1 11 L7 Aviation Limited Warranty 1 11 2 PLU WI Wen M 2 1 20 MAS 2 1 22 JATUGTaDL B QUID 2 3 INSDIAELATION OVERVIEW sisspiss pussvadosp ssspyssasssvssnssssdsasssnenssenseonesausnssnsnedsonneredesssossbesnesnssssesnssn 3 1
76. be shielded must be shielded per Appendix D Refer to Section 4 4 2 and Section 4 5 for connector and tooling information Refer to Section 4 6 for recommended coax cable Refer to Appendix D for the appropriate wiring connections to assemble the wiring connector Once the cable assemblies have been made attach the cable connectors to the rear connector plate After installing the mounting tube attach the assembled connector plate Route the wiring bundle as appropriate Use 22 or 24 AWG wire for all connections For power and ground use the wire gauge specified in the interconnect drawing then 22 AWG for the short length from the splice to the connector Avoid sharp bends 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 3 3 A GARMIN 3 5 Air Circulation and Cooling N CAUTION To avoid damage to the GTR GNC take precautions to prevent Electro Static Discharge ESD when handling the GTR GNC connectors fan and associated wiring ESD damage can be prevented by touching an object that is of the same electrical potential as the GTR GNC before handling the GTR GNC itself The GTR GNC unit meets all requirements without external cooling However with all electronic equipment lower operating temperatures extend equipment life Reducing the operating temperature by 15 to 20 C 27 to 36 F reduces the mean time between failures MTBF Units tightly packed in the avionics stack heat each other through
77. ced output and the LO output must be connected COM AUDIO is summation of the COM receiver audio COM sidetone audio and intercom audio 500 AUDIO HI P2001 500 Q COM AUDIO LO P2001 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 5 8 Rev B GARMIN 5 2 5 COM Discrete Inputs Active Low discrete inputs are considered active if either the voltage to ground is lt 3 5 VDC or the resistance to ground 1s lt 375 2 These inputs are considered inactive if the voltage to ground is 6 5 33 VDC or the resistance to ground is gt 100 kQ Active High discrete inputs are considered active if the voltage to ground Is gt 6 5 VDC These inputs are considered inactive if the voltage to ground 1s lt 3 5 VDC the resistance to ground is lt 375 Q Pm 19 An asterisk following a signal name denotes that the signal is an Active Low requiring a ground to activate If there is no asterisk the signal 1 an Active High 5 2 5 1 COM MIC 1 KEY COM MIC 1 KEY discrete input when pulled low allows the audio that is present on the COM MIC 1 AUDIO IN HI P2001 5 to be transmitted over the radio 5 2 5 2 INTERCOM ENABLE The INTERCOM discrete input enables the intercom function of the GTR GNC when grounded This input can be connected to a switch that when activated will enable the intercom function There is also a menu option to enable the intercom 1f i
78. come in the form of an incorrect frequency incorrectly identified airport VOR or other station or any other displayed item used for navigation or communication the air or on the ground Go to flyGarmin com and select Aviation Data Error Report 1 7 Aviation Limited Warranty All Garmin avionics products are warranted to be free from defects in materials or workmanship for two years from the date of purchase for new Remote Mount and Panel Mount products one year from the date of purchase for new portable products and any purchased newly overhauled products six months for newly overhauled products exchanged through a Garmin Authorized Service Center and 90 days for factory repaired or newly overhauled products exchanged at Garmin in lieu of repair Within the applicable period Garmin will at its sole option repair or replace any components that fail in normal use Such repairs or replacement will be made at no charge to the customer for parts or labor provided that the customer will be responsible for any transportation cost This warranty does not apply to 1 cosmetic damage such as scratches nicks and dents 11 consumable parts such as batteries unless product damage has occurred due to a defect In materials or workmanship 111 damage caused by accident abuse misuse water flood fire or other acts of nature or external causes iv damage caused by service performed by anyone who 15 not an authorized service provider of Ga
79. command messages are supported e Request data output Set Active NAV frequency GNC ONLY Set Standby NAV frequency GNC ONLY Set Active COM frequency Set Standby COM frequency Set Squelch Override Set COM Volume Level and Audio Control Parameters Set COM channel spacing Set NAV audio mode GNC ONLY Set Omni Bearing Select OBS value GNC ONLY Set NAV Volume Level GNC ONLY 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 5 7 GARMIN 5 2 4 3 COM Audio 5 2 4 4 Audio Function Activation of COM MIC 1 TRANSMIT enables MIC 1 AUDIO IN HI and causes the transceiver to transmit Activation of COM MIC 2 TRANSMIT enables MIC 2 AUDIO IN HI and causes the transceiver to transmit 50002 COM AUDIO 1s a 100 mW audio output that is intended to drive a headset or an audio panel 5 2 4 5 Audio Electrical Characteristics 5 2 4 5 1 COM MIC AUDIO MIC 1 and MIC 2 are standard carbon or dynamic mic inputs with integrated preamps providing minimum 70 mVrms into a 1000 Q load MIC 1 and MIC 2 are set in the factory so that 100 mVrms modulates the transmitter to 85 nominally at 1000 Hz The microphone gain adjustment is made through Configuration Mode ________________ Connector Pin COM MIC 1 AUDIO IN HI P2001 COM MIC 2 AUDIO IN HI P2001 6 MIC AUDIO IN LO P2001 5 2 4 5 2 AUDIO COM AUDIO supplies 100 mW into 5000 load This is a balan
80. de to IDENT B 2 4 1 10 Set Omni Bearing Select OBS Value This message 1 used to set the OBS value used by the GNC as the selected radial for computing the course deviation from a VOR This message will have no effect unless the GNC 1s configured to use the serial port as its OBS source or SERIAL Message format m umm Message class This is a VHF NAV message uc M Message identifier pa NM E OBS Value in degrees ranging from 000 to 359 Example message PGRMV34310 lt chksm gt lt CR gt lt LF gt Set the OBS value to 310 degrees B 2 4 1 11 Set NAV Volume Level This input is used to set the volume level for the NAV mixed audio Message format e dmm Message class This is a GNC NAV message is d Message ident VV Volume level 00 FFh two encoded hex characters 30h 3Fh Example message PGRMV43 l lt chksm gt lt CR gt lt LF gt Set the NAV volume to I Dh out of FFh 30h Dh 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page B 11 A GARMIN B 2 4 2 Output Messages B 2 4 2 1 COM Transcei ver Status This message is used to output the current status of the GTR GNC COM It will be output at the configured message rate 1 Hz or whenever the status changes Message format Message class This is GTR GNC COM message um Message identifier PE Active frequency m MEZ where m desired MHz frequency 30h Example mes
81. e 4 1 Coaxial Cable Installation LLL 4 4 Figure 6 1 Configuration Mode Home Page 6 2 Seral Pon P u uu u sxs ESENE E EEE UE AEN 6 3 k P u M 6 3 Figure 6 4 Intercom Enable uuu uuu u u uuu 6 4 Ji Oi ____ ________ nas 6 4 Figure 0 6 Photocell PAGE EAE ann anaE 6 5 Peme G alii BUs ____ __ 6 6 Figure 6 8 Display Information Pages rr nns reser rss rr nnne nnne 6 6 Iasure6 9 Display Update uuu uu 6 7 Pewee 6 7 Peur Osti ARINGA290 6 8 Figure 6 12 NA V Information Pag 6 9 Figure 6 13 NAV Software Update Page a rr rr rr rr rn na 6 9 i o MICA CR 6 9 Figure 6 15 COM RX Squelch Page 6 10 Picur 66 COM Information Papa uuu uzanan 6 10 Figure 6 17 COM Software Update Page a a i n E n 6 10 CON Ilo us 6 11 Figure 6 19 Mix NAV Audio 6 11 ____ __64 __4 ones 6 1
82. e USB slot 4 Run the executable file that was downloaded and follow the prompts on the screen to create the software loader USB drive 5 After the card has been created select finish to complete the process 6 Remove the USB drive from the slot The GTR GNC USB loader drive is now ready to use GTR 225 GNC 255 TSO Installation Manual 190 01 182 02 Page 6 20 Rev B A GARMIN 6 8 2 Loading Software to the GTR GNC To load software to the GTR GNC ensure that the unit Is powered on in the configuration mode 1 Connect the provided USB adapter to the USB slot on the GTR GNC Insert the software loaded USB flash drive into the other end of the cable as shown in Figure 6 26 USB Port USB Cable USB Flash Drive Figure 6 26 USB Update Progress 2 From the configuration mode home page press ENT to access the SYS Configuration page Turn the small inner knob clockwise until the software update page is displayed Press ENT to begin the software update 3 Verify that the available GTR GNC software updates are being displayed Press the ENT key to begin the software update When the updates are finished the GTR GNC will display the updates 5 Verify the software updates loaded successfully 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 21 GARMIN 6 8 3 Load Database l Insert the supplied cable into the USB port on the top right corner of the GTR GNC 2 Insert the USB memory device into th
83. e in the photocell input level This field has a range of 0 to 100 and is set to 50 as the default setting This parameter configures the point at which key backlighting is switched off in bright light For example a value of 70 results in the key backlights being turned off at photocell source input levels above 70 This field has a range of 0 zero to 100 and is set to 80 as the default setting KEY CO Key Cutoff Adjusts the lighting level up or down for any given photocell input level This OFFSET field has a range of 0 zero to 100 and is set to 50 as a default value This may also be used to match lighting curves with other equipment in the panel 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 5 A GARMIN 6 4 1 6 Lighting Bus 1 and Lighting Bus 2 The Lighting Bus 1 and Lighting Bus 2 page Figure 6 7 allows the installer to configure the parameters of each lighting bus See Table 6 5 for descriptions of each parameter LIGHTING BUS 1 AS a voc 50 Figure 6 7 Lighting Bus Table 6 5 Lighting Bus Parameter Description Description INPUT This setting configures the lighting bus source voltage Select 14 VDC 28 VDC 5 VDC or 5 VAC depending on the lighting bus voltage source This setting determines how sensitive the display or bezel keys are to changes in the SLOPE lighting bus input leve
84. e on GTR GNC e n FRESS EHT DISPLAY UPDATE Figure 6 9 Display Update Page 6 4 2 NAV Configuration GNC Only 6 4 2 1 CDI Indicator The CDI Indicator page Figure 6 10 allows the installer to configure the type of Course Deviation Indicator CDI that 15 connected to the GNC The setting 1 based upon the connected CDI See Table 6 6 for settings RESOLVER Figure 6 10 CDI Indicator Page Table 6 6 CDI Indicator Selections No external resolver is supported OBS mode allows the user to edit the OBS with concentric knobs Serial OBS update messages are supported in this mode but the unit will not flag if updates are discontinued or are not periodic NONE DEFAULT Auto decodes resolver setting via six wire resolver interface Uses internal DSP to compute course information See Section 6 5 1 for calibration CONVERTER Disables all internal OBS functions Allows use of conventional external converter via the composite output pin RESOLVER For use with serial Electronic Flight Instruments EFIS conforming to the SERIAL Garmin Serial Data Specification See Appendix B 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 7 GARMIN 6 4 2 2 ARINC 429 GNC Only The ARINC 429 page Figure 6 11 allows the installer to configure the NAV ARINC 429 output on the GNC Configure the port according to the connected VOR ILS indicator See Table 6 7 and Table 6
85. e other end of the cable 3 Press FUNC to access the Functions Turn the LARGE knob to select the SYS function Turn the SMALL knob to view the Load Database function Then press the ENT key FRESS TO LOAD DATABASE FROM LEE CLE TO CHHCEL Figure 6 27 Database Update Display 4 Verify the database version on USB Then press the ENT key Updating will begin automatically DATABASE VERSIONS INSTALLED ON DRIVE CYCLE 1113 CYCLE 1 0 Figure 6 28 Verify Database Version 69 Documentation Checks 6 9 1 Airplane Flight Manual Supplement Ensure that the Airplane Flight Manual Supplement AFMS is inserted in the Airplane Flight Manual or Pilot s Operating Handbook GTR 225 GNC 255 TSO Installation Manual 190 01 182 02 Page 6 22 Rev B GARMI N 7 PERIODIC MAINTENANCE 7 1 Equipment Calibration No scheduled servicing tasks are required on the GTR GNC 7 2 VOR Checks Refer to CFR 14 paragraph 91 171 Every 30 days verify the limits of the permissible indicated bearing error 7 3 Cleaning The front bezel keypad and display can be cleaned with a microfiber cloth or with a soft cotton cloth dampened with clean water DO NOT use any chemical cleaning agents Care should be taken to avoid scratching the surface of the display 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 1 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 0118
86. e sales receipt from the original retailer is required Garmin will not replace missing components from any package purchased through an online auction International Purchases A separate warranty may be provided by international distributors for devices purchased outside the United States depending on the country If applicable this warranty 1s provided by the local in country distributor and this distributor provides local service for your device Distributor warranties are only valid in the area of intended distribution Devices purchased in the United States or Canada must be returned to the Garmin service center in the United Kingdom the United States Canada or Taiwan for service 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 1 11 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 1 12 Rev A A GARMIN 2 LIMITATIONS 2 1 Installation Conditions and tests required for TSO approval of this article are minimum performance standards It is the responsibility of those installing this article either on or within a specific type or class of aircraft to determine that the aircraft installation conditions are within the TSO standards TSO articles must have separate approval for installation in an aircraft The article may be installed only 1 performed under 14 CFR part 43 or the applicable airworthiness requirements To mitigate against the loss of navigation and
87. e when the NAV receiver status changes Message format Message class This 15 message EU unn na Message identifier jl sss Active NA V frequency m MHz where m 30h desired MHz frequency In the range of 108 to 117MHz k desired frequency in KHz where desired frequency 25KHz 30h with desired frequency in range of 000 to 950KHz Note that valid NAV frequencies only lie on 50KHz boundaries 1 e 108 00 108 05 108 10 etc E Standby NA V frequency m MHz where m 30h desired MHz frequency in the range of 108 to 117MHz 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page B 17 A GARMIN k desired frequency in KHz where k desired frequency 25KHz 30h with desired frequency in range of 000 to 950KHz Note that valid NAV frequencies only on 50K Hz boundaries i e 108 00 108 05 108 10 etc po um Reserved Example message PGRMV28E4 PN lt chksm gt lt CR gt lt LF gt Active NA V frequency 15 117 100 MHz Standby NA V frequency 1 111 800 MHz B 2 4 2 12 NAV Audio Mode This message 1 used to output the current NA V audio mode There are two possible settings for this mode There are two possible settings for this mode The first is IDENT which will suppress the votce portion of the NAV audio signal and emphasize the Morse Code station identifier unit will display ID in the upper left corner of the NA
88. ecoded station identifier five characters long If the decoded identifier 15 less than five characters in length then the trailing characters will be filled in with spaces Identifiers are restricted to using ASCII character 0 9 and A Z GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page B 16 Rev B A n GARMIN Example message SPGRMV25VISLE lt Sp gt lt chksm gt lt CR gt lt LF gt The decoded station identifier is valid and is ISLE B 2 4 2 10 Communications Error This message is used to indicate a communication error Message format GNC NAV error m ut Message class This is a GNC NAV message porum Message identifier Error code ASCII 0 input message checksum error 1 unknown message 2 error or mismatch in message data Message format GTR GNC COM error Message class This is GTR GNC COM message Message identifier Error code ASCII 0 input message checksum error 1 unknown message 2 error or mismatch in message data Example messages PGRMV271 lt chksm gt lt CR gt lt LF gt Received an unknown NA V message PGRMC050 lt chksm gt lt CR gt lt LF gt Received a COM message with an invalid checksum B 2 4 2 11 NAV Receiver Status This message is used to output the current status of the NAV receiver It will be output at the configured rate and will output faster than the configured rat
89. edance Microphone Low impedance carbon or dynamic with transistorized pre amp Glideslope Antenna 4 4 2 Materials Required but not Supplied New Installations Only The GTR GNC is intended for use with the standard aviation accessories The following items are required for installation but not supplied Wire MIL W 22759 16 or equivalent Shielded Wire MIL C 27500 or equivalent e Hardware 46 32 100 Flat Head SS Screw MS24693 ANSO7R or other approved fastener ea and 86 32 Self Locking Nut MS21042 or other approved fastener 6 ea Push Pull manually resettable Circuit Breakers Tie Wraps or Lacing Cord Ring Terminals for grounding Coaxial Cable RG 400 RG 142B or equivalent Refer to Table 4 8 for additional information GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 4 2 Rev B A GARMIN 4 5 Special Tools Required Some of the connectors use crimp contacts The table below identifies crimp tools required to ensure consistent reliable crimp contact connections for the rear D sub connectors Table 4 3 Recommended Crimp Tools or Equivalent 22 28 AWG P1001 P1005 Hand Crimping extraction Extraction extraction 01 Military P N M22520 2 01 M22520 2 09 81960 4 04 9507 0 0 0 0 0 0 902400 4 0 0 M81969 04 04 LEE ITT Cannon 995 0001 584 995 0001 739 274 7048 000MIL Tool Positioner 91067 1 M819
90. er that is specified as safe for anti reflective coatings aN CAUTION The use of ground based cellular telephones while aircraft are airborne is prohibited by FCC rules Due to potential interference with onboard systems the use of ground based cell phones while the aircraft is on the ground is subject to FAA regulation 14 CFR 91 21 FCC regulation 47 CFR 22 925 prohibits airborne operation of ground based cellular telephones installed in or carried aboard aircraft Ground based cellular telephones must not be operated while aircraft are off the ground When any aircraft leaves the ground all ground based cellular telephones on board that aircraft must be turned off Ground based cell phones that are on even in a monitoring state can disrupt GPS SBAS performance 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 1 1 A GARMIN 4 NOTE All screen shots used in this document are current at the time of publication Screen shots are intended to provide visual reference only All information depicted in screen shots including software file names versions and part numbers is subject to change and may not be up to date 1 3 Technical Specifications 1 3 1 Physical Characteristics Characteristics Specifications Bezel Height 1 65 in 41 9 mm Bezel Width 6 25 in 158 8 mm Rack Height Dimple to Dimple 1 72 in 43 82 mm Rack Width 6 30 in 160 02 mm Depth Behind Panel with Connectors Measured from
91. f unsupported output identifiers will not generate a Communication Error message Message format GNC NAV requests m i Message class This is a GNC request Message identifier Output identifier of requested message two ASCII characters 29 Request NAV Audio 40 Request NAV Volume 41 Request GNC Status um Reserved Message format GTR GNC requests Message class This is GTR GNC request 06 ur Message identifier z u ua Output identifier of requested message two ASCII characters 02 Request COM Audio Volume 03 Request COM software version 13 Request GTR Status Message sub id set to ASCII 1 Request COM Audio Volume 0 otherwise 007 Reserved 225 GNC 255 TSO Installation Manual 190 01182 02 Page B 6 Rev B GARMI N Example messages S PGRMV2429000 lt chksm gt lt CR gt lt LF gt Request the GNC to send the current NA V Audio configuration PGRMC0613000 lt chksm gt lt CR gt lt LF gt Request the GTR GNC to send the current COM status B 2 4 1 2 Set Active COMM Frequency and Transceiver Function This message 15 used to set the Active COM frequency as well the transcetver function Message format Message class This is GTR GNC COM message Message identifier Active frequency m desired frequency in MHz in hexadecimal where m
92. igned to mount in the avionics stack in the aircraft instrument panel within view and reach of the pilot The primary unit location should minimize pilot head movement when transitioning between looking outside of the cockpit and viewing operating the GTR GNC The location should be such that the GTR GNC unit is not blocked by the glare shield on top or by the throttles control yoke etc on the bottom If aircraft has a throw over yoke be sure the yoke does not interfere with the GTR GNC GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 3 2 Rev B A GARMIN 3 4 Cabling and Wiring Considerations Wiring should be installed in accordance with AC 43 13 1B Chapter 11 For dual GTR GNC unit installations care should be taken to ensure separation between wires of redundant systems to reduce the possibility of loss of navigation due to a single event When wire separation cannot be achieved the following issues should be addressed It should not be possible for a cable harness to be exposed to wire chafing in a manner that both units fail simultaneously The cable harness should not be located near flight control cables and controls high voltage lines or fuel lines The cable harness should be located in a protected area of the aircraft e g isolated from engine rotor burst and Do not route cable near high voltage sources Pigtail lengths should be less than 3 0 inches Wiring which is required to
93. io Page 6 4 4 3 Hi Fidelity Audio The Hi Fidelity Audio page Figure 6 20 allows the installer to enable or disable the hi fidelity Aux audio input on the GTR GNC If a music audio source is connected to P2001 3 and 19 it may be desirable to enable the Hi Fidelity audio Use the smaller inner knob to select On or Off Press ENT when the appropriate selection is displayed ei HI FIDELITY AUDIO ENABLED PER Figure 6 20 Hi Fidelity Audio Page 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 11 A GARMIN 6 4 5 Log Functions 6 4 5 1 Download Log NOTE Garmin recommends the use of a USB 2 0 compatible USB flash drive for updating databases and software on the GTR GNC The Download Log page Figure 6 21 15 where the GTR GNC keeps an error log to aid in diagnostics and troubleshooting The error log can be downloaded to a zip drive attached to the USB port on the GTR GNC To download the error log insert the USB dongle cable into the GTR GNC USB port and attach a USB flash drive to the dongle Then select the Download Log page When ready press the ENT key to download the error log to the USB flash drive DOWNLOAD LOG PRESS ENT TO DOWNLOAD LOG TO USB Figure 6 21 Download Log Page 6 4 5 2 Clear Error Log The Clear Error Logs page Figure 6 22 allows the installer to clear the internal error log on the GTR GNC It can be cleared by selecting the Clear Error Log page w
94. irst GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page B 4 Rev B GARMIN B 2 RS 232 NMEA Data Format B 2 1 Electrical Interface The I O signals are compatible with RS 232C Data is generated at 9600 baud with a word length of 8 bits one stop bit and no parity The data format for the serial communication 15 Baud rate 9600 Data bits 8 Stop bits 1 Parity None B 2 2 Message Formats All messages conform to the NMEA 0183 proprietary message format as follows All characters will be standard ASCII characters No binary data characters are used y dtm Start of message character ASCII 024h IP Proprietary message identifier GRM uu metit Garmin company identifier Message class identifier Identifies a message as either a COMM or NAV message The GTR and COM portion of the GNC use C while message for the NAV portion of the GNC use Ll Message identifier two digit number in ASCII characters uu aa Message data characters defined for each message chksum Message checksum including message identifier nn through data characters d d The two digit checksum is generated by adding all values of valid characters together ignoring carry if any This value is converted into two encoded hex characters 30h 3Fh ASCII return 0Dh L ASCII line feed OAh The maximum message length including
95. ith the smaller inner knob and then pressing the ENT key Press ENT again to clear the stored error logs This will delete all stored error logs on the GTR GNC CLEAR ERROR LOGZ PRESS ENT CLEAR ERROR LOGS Figure 6 22 Clear Error Logs Page GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 6 12 Rev B A GARMIN 6 5 Ground Checks Configuration Mode The following checks are performed in configuration mode To enter configuration mode remove power from the GTR GNC With the GTR GNC turned off press and hold the ENT key and apply power to the GTR GNC by turning the COM volume knob clockwise Release the ENT key when the display activates and Garmin appears on the screen 6 5 1 Calibrate Resolver GNC Only After selecting Resolver as the indicator head on the CDI Indicator page Figure 6 10 of the NAV group it is necessary to calibrate the interface between the GNC and the resolver The accuracy of the system is dependent on this calibration The GNC cannot drive multiple resolvers at the same time It is not recommended that external resolvers be switched through a relay or other means because the resolver must be calibrated to the radio as described in this procedure If multiple resolvers are desired in the installation the primary unit must be installed and calibrated as described here The secondary unit should use the composite output 1 After selecting Resolver as the indicator head type select
96. l Adjusting the slope higher will result in a brighter display for a given increase in the lighting bus input level This field has a range of 0 to 100 and is set to 50 as the default setting This setting adjusts the lighting level up or down for any given lighting bus input level OFFSET This field has a range of 0 zero to 100 and is set to 50 as a default value This may also be used to match lighting curves with other equipment in the panel 6 4 1 7 Display Information The Display Information page Figure 6 8 allows the installer to view and verify the display software version part number serial number minimum software level hardware version boot version part number and minimum boot version of the unit c DISPLAY IMFORMAT ION H 01 H 1 74 04 MEHU FAGET i DISPLAY INFORMATION H 900001 1 ER MIN 00 m c DISPLAY VER F H HHE E 133714 ED MEHU BOOT OO Figure 6 8 Display Information Pages GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 6 6 Rev B GARMIN 6 4 1 8 Display Update The Display Update page Figure 6 9 allows the installer to load the display software to the GTR GNC Refer to Section 6 8 for instructions on how to load software to the GTR GNC NOTE Garmin recommends the use of a USB 2 0 compatible USB flash drive for updating databases and softwar
97. l for the headphone output and various audio controls parameters Message format pog Message class This is a GTR GNC COM message E vmm Message ident llasa Data type ASCII 1 headphone 4 sidetone level 9 RF squelch a Volume level 00 FFh two encoded hex characters 30h 3Fh Example message PGRMC021 1 lt chksm gt lt CR gt lt LF gt Set the speaker output volume to 1Dh out of FFh 3Dh 30h Dh GTR 225 GNC 255 TSO Installation Manual 190 01182 02 8 Rev A GARMIN B 2 4 1 5 Select Squelch Override This input is used to turn the manual squelch on and off Message format utm Message class This is a GTR GNC COM message uus ES Message ident n nn S Squelch test ASCII 0 automatic 1 manual override displays SQ Example message PGRMC030 lt chksm gt lt CR gt lt LF gt Set the squelch to normal operation B 2 4 1 6 Set COM Channel Spacing This input is used to adjust the configured channel spacing for COM frequencies Message format E nu Message class This is a GTR GNC COM message L Message ident EE EEEE New spacing ASCII 83 8 33 KHz spacing 25 25 KHz spacing Example message PGRMC183 lt chksm gt lt CR gt lt LF gt Set channel spacing to 25 KHz B 2 4 1 7 Set Active NAV Frequency This message is used to set the active NAV frequency Message format p d Message class This is a GNC NAV message d d Message identifier
98. lag status where f N NAV flagged or NAV valid status only data transmitted dashes to indicate end of 1 sentences NM case d dd d da Distance to destination waypoint in tenths of nautical Lima miles The altitude 1 not output if the RS 232 port is configured as Aviation Output 2 The line feed character 15 not output if the RS 232 port is configured as Aviation Output 2 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page B 2 Rev B GARMIN B 1 4 Aviation Output Sentence Type 2 The GTR GNC Type 2 aviation output sentence has the following general format id item designator 3 ASCII characters seq sequence number 1 binary byte wpt waypoint identifier 5 ASCII characters lat waypoint latitude 3 binary bytes lon waypoint longitude 4 binary bytes mvar magnetic variation at waypoint 2 binary bytes CR ASCII carriage return character 0D hex LF ASCII line feed character OA hex Each waypoint In the route being navigated by the interfacing equipment has a Type 2 sentence output by the interfacing navigation equipment approximately once every second If no route is being navigated by the interfacing navigation equipment 1 the active route is empty the following Type 2 sentence is output approximately once every second id item designator 3 ASCII characters route sequence number is 01 seq sequence number 1 binary b
99. n A T handle can be used for this but ensure that the screw 15 not over tightened 4 Count number of complete revolutions the Allen screw can be turned until it cannot turn any more Take care not to over tighten Three turns 15 the minimum for proper installation If fewer than three turns are possible the mounting rack should be moved aft toward the pilot such that the aircraft panel does not obstruct the unit from properly engaging in the rack 6 4 Configuration Mode Operations The configuration pages shown in this section reflect main software version 2 00 Some differences in operation may be observed when comparing the information in this manual to later software versions Configuration mode 15 used to configure the GTR GNC settings for each specific installation To access configuration mode remove power from the GTR GNC With the GTR GNC turned off press and hold the ENT key and apply power to the GTR GNC by turning the COM volume knob clockwise Release the ENT key when the display activates and Garmin appears on the screen The first page displayed is the Config Mode page While In configuration mode pages can be selected by turning the outer knob to select the high level page turning the inner knob to select the subpage and then pressing the ENT key to select the desired page There are five main page headings SYS NAV COM AUD and LOG From the main heading turn the inner knob to select the desired subpage and the
100. n acceptable place to insert the VSWR Any problem with the antenna installation is most likely seen as high reflected power A VSWR of 3 1 may result in up to a 50 loss in transmit power GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 4 6 Rev B A GARMIN 5 CONNECTOR PINOUT INFORMATION 5 1 Pin Function List 5 1 1 P2001 Connector COM Board View looking at rear of unit Pin 1 is top right 43 42 41 40 34 Ca Reserve OoOO 76 COMMC2AUDONHI muu 9 Reservo O 10 RESERVED 4 RESERVED s EN Ca Resev 1 5 S9 QCOMAUDOIO AA 19 AUXAUDOUNELEVELOND RESERVED _ RESERVED 7 CMMG2KEY 27 COMREMOTETUNEUP 0 2 RESERVED x 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 5 1 A GARMIN Pim PimName RESERVED 35 RESERVED 36 RESERVED lt 3T 38 NRCRAFTOND 39 40 NRORAFTOND RSEVED k AIRCRAFT POWER 44 AIRCRAFT An asterisk following a signal name denotes that the signal is an Active Low requiring a ground to activate If there is no asterisk the signal is an Active High GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 5 2 Rev B
101. n press the ENT key See Figure 6 1 CONFIGURATION NAY CONF IGURAT ION COM CONF IGURAT I ON AVD CONF IGURAT ION Figure 6 1 Configuration Mode Home Page GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 6 2 Rev B A GARMIN 6 4 1 SYS Configuration 6 4 1 1 Serial Port The Serial Port page Figure 6 2 allows the installer to configure the I O mode for the RS 232 port See Table 6 1 for the selections that are available SERIAL FORT MODE Figure 6 2 Serial Port Page Table 6 1 Serial Port Selections NONE No unit s connected to input output of this channel AVN AVN Serial data transfer with the 6XX 7XX and GNS 400W 500W series Serial data transfer with G500 G600 GPSMap Aera Series XL Series or NMEA GX Series 6 4 1 2 DST Display The DST Display page Figure 6 3 allows the installer to configure source priority for the display of distance speed time DST information if both GPS and DME systems are providing data to the GNC The GNC can display DST data from a DME or GPS device Select GPS DME to give priority to DST data from a connected GPS receiver or DME GPS to give priority to DST data from a connected DME receiver OST FRIORITY T ia GPS DHE Figure 6 3 DST Display Page 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 3 GARMIN 6 4 1 3 Intercom Enable The Intercom Enable page Figure 6
102. nected exercise the switch source 2 Verify that the function controlled by the switch operates as intended 3 Ifthe switch is exercised and does not cause the GTR GNC to operate as intended verify the wiring between the GTR GNC and the switch 6 6 2 VHF NAV Checkout Check the VOR reception with ground equipment operating VOT or VOR and verify audio and Morse code ID functions if possible Tune a localizer frequency and verify the CDI needle NAV flag VDI needle and GS flag operation 6 6 3 NAV Audio Check Audio Panel Installations GNC Only 1 Ensure the audio panel is powered on and perform the following steps 2 Plug ina headset at pilot and copilot position 3 Tune the GNC NAV receiver to a local VOR station and select NAV audio on the audio panel 4 Ensure the Morse code identifier 1s being received over the crew headsets 5 Ifthe audio is not heard verify the wiring connections to the audio panel 6 Ensure the audio volume is sufficient for all anticipated cockpit noise conditions GTR 225 GNC 255 TSO Installation Manual 190 01182 02 6 16 GARMIN 6 6 4 VHF COM 6 6 41 Antenna Check If desired the antenna VSWR can be checked using an inline wattmeter in the antenna coaxial using frequencies near both ends of the band The VSWR should be less than 2 1 A VSWR of 2 1 will cause a drop in output power of approximately 12 6 6 4 2 Receiver Transmitter Check Tune the unit to a local VHF fre
103. om 93 to 13 dBm power absorbed by a 500 load SINAD on all channels is greater than 6 dB when the RF level is Sensitivity 2 uV hard or 107 dBm power absorbed by 500 load modulated 30 at 1000 Hz at rated audio output power Squelch Automatic squelch with manual override 6 dB BW is greater than 7 kHz for 25 kHz channeling Selectivity 60 dB BW is less than 22 kHz for 25 kHz channeling 6 dB BW is greater than 3 5 kHz for 8 33 kHz channeling 60 dB BW is less than 7 37 kHz for 8 33 kHz channeling 1 3 5 VOR Specifications Characteristics Specifications Receiver Audio Sensitivity At 103 5 dBm S N N is not less than 6 dB Course Deviation Sensitivity 103 5 dBm or less for 60 of standard deflection The VOR LOC Course Deviation Flag must be flagged when RF signals are absent Flag 9960 Hz modulation is absent either one of the two 30 Hz modulations are absent the level of a standard VOR deviation test signal produces less than a 50 of standard deflection From 99 dBm to 13 dBm input of a Standard VOR Audio Test AGC Characteristics Signal audio output level does not vary more than 3 dB Spurious Response Greater than 60 dB The bearing information as presented to the pilot does not have an VOR OBS Bearing Accuracy error in excess of 2 7 as specified by RTCA DO 196 and EuroCAE ED 22B Audio Output A minimum 100 mW into a 5000 load Deflection Response 0 5 to 2 7 seconds Less than 6 dB of va
104. osvae dp Class C GTR GNC COM message V GNC NAV message EN Table B 4 Output Message Summary Length Comment 17 13 18 Decoded Station Identifier Communications Error 1 When error detected NAV Receiver Status status change Low NAV Audio Mode Upon request status change Comm Transceiver Status status change Low Comm Software Version Upon request Length is in bytes and includes the start of message character and the lt CR gt lt LF gt end of message sequence 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page B 19 21 22 23 25 28 9 2 Q A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page B 20 Rev B APPENDIX C MECHANICAL DRAWINGS C 1 Drawing List The following drawings are included in this section OO OO 0 Figure 1 GTR GNC Dimensions Figure C 2 GTR GNC Mounting Rack Figure C 3 GNC Center of Gravity Figure C 4 GTR Center of Gravity Figure C 5 GTR GNC Rear Connector Layout Detail Figure C 6 Panel Cutout Detail Figure C 7 GTR Mounting Rack 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev A GARMIN Page C 1 A GARMIN This page intentionally left blank GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page C 2 Rev GARMIN
105. ot to mark TSO number and software part number on the exterior of the unit 2 Garmin was granted a deviation from the TSO to use RTCA DO 160F instead of an earlier TSO C40c version as the standard for environmental conditions and test 3 Garmin was granted a deviation from the TSO to use RTCA DO 178B instead of an earlier version to demonstrate compliance for the verification and validation of the computer software 1 Garmin was granted a deviation from the ETSO to have a deflection response of 0 5 to 2 7 ETSO 2C40c seconds 1 Garmin was granted a deviation from the TSO not to mark TSO number and software part number on the exterior of the unit TSO C128a 2 Garmin was granted a deviation from the TSO to use RTCA DO 160F instead of an earlier version as the standard for environmental conditions and test number on the exterior of the unit TSO C169a 2 Garmin was granted a deviation from the TSO to use RTCA DO 160F instead of an earlier version as the standard for environmental conditions and test 1 5 3 FCC Grant of Equipment Authorization GTR 225 GTR 225A GTR 225B IPH 01594 1312A 01594 GNC 255A GNC 255B GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 1 10 Rev B GARMIN 1 6 GTR GNC Database The GTR GNC has a database of frequencies for airports and VORs Garmin requests that the flight crew report any observed discrepancies related to database information These discrepancies could
106. quency and verify the receiver output produces a clear and understandable audio output Verify the transmitter functions properly by contacting another station and getting a report of reliable communications 6 6 4 3 Aux Audio Input Check This check 15 only required for installations with an aux audio source connected to pins P2001 3 and 19 1 Connect an audio source to the Aux Audio input P2001 3 and 19 2 Verify that AUX audio 1 heard over the pilot headset position 6 6 4 4 Database Check Check the Frequency Database to ensure it 1 current The database information is displayed during the unit display start up sequence To check the database l Cycle power on the GTR GNC The Unit will go through its normal start up sequence 2 Press FUNC and select SYS configuration with the larger outer knob Rotate the smaller inner knob to select DATABASE INFO and press the ENT button 3 Verify that the effectivity EFCTV date has not passed for the frequency database 6 6 4 5 RS 232 Serial Interface Checks The interfaces to RS 232 equipment such as the GTN 6XX 7XX or GNS 400W 500W series GPS sources should be checked as follows l Operate the connected GPS source and the GTR GNC in normal mode Ensure the aircraft has a clear view of the sky for this check This check should not be performed in a hangar Ensure the connected GPS source has a valid GPS satellite fix 3 Press the FUNC button and rotate the smaller inner knob to the Nea
107. rest Airport menu Verify that GPS is not displayed on the screen If the GTR GNC displays GPS verify the wiring between the GPS source and the GTR GNC The interfaces to RS 232 equipment such as the G500 G600 or other serial interface should be checked as follows I Operate the connected serial remote tune source and the GTR GNC in normal mode 2 Ensure that the remote source 15 able to display data from the GTR GNC 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 17 GARMIN 6 6 5 Interface Checkout This section describes the checks that must be carried out to verify that systems interfacing to the GTR GNC are communicating properly Only those interfaces that are connected to the GTR GNC must be verified 6 6 5 1 External RMI OBI Interface Check GNC Only If the VOR OBI output from the GNC is connected to an RMI navigation indicator verify the interface as described in this section If the following steps do not perform correctly check the electrical connections and configuration setup The aircraft heading system must be operating properly order for the RMI needle to point correctly 1 Apply power to the equipment 2 If installed set the RMI select switch to the VLOC position 3 Tune a local VOR station or use a simulated signal from an approved VOR Test System 4 Verify that the RMI needle swings and points toward the VOR station 6 6 5 2 DME Tuning Check GNC Only I
108. riation between 350 and 2500 Hz In voice Audio Response mode an IDENT tone of 1020 Hz Ident Tone is attenuated at least 20 dB down The distortion in the receiver audio output does not exceed 10 at Audio Distortion all levels up to 100 mW GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 1 4 Rev B GARMIN 1 3 6 LOC Specifications Characteristics Specifications Receiver Audio Sensitivity At 103 5 dBm S N N is not less than 6 dB At 103 5 dBm deviation output is not to be less than 60 of standard deflection when a LOC deviation test signal is applied The VOR LOC Course Deviation Flag is flagged when the level of a standard LOC deviation test signal produces 50 or less of standard deflection of the deviation indicator 150 Hz modulation is absent 90 Hz modulation is absent 90 Hz and 150 Hz modulation are both absent RF signals are absent From 99 dBm to 13 dBm input of a standard localizer audio test AGC Characteristics signal audio output level does not vary more than 3 dB 6 dB BW is greater than 9 kHz Selectivity 69 dB BW is less than 36 kHz With a standard deflection FLY LEFT condition 90 Hz dominant the output is 90 mV 9 mV With a standard deflection FLY RIGHT condition 150 Hz dominant the output is 90 mV 9 mV Spurious Response Greater than 60 dB Centering Accuracy 0 0 01023 or 0 9 9 mV Audio Output A minimum 100 mW in
109. rmin v damage to a product that has been modified or altered without the written permission of Garmin In addition Garmin reserves the right to refuse warranty claims against products or services that are obtained and or used In contravention of the laws of any country THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES WHETHER EXPRESS IMPLIED OR STATUTORY INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE STATUTORY OR OTHERWISE THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS WHICH MAY VARY FROM STATE TO STATE IN NO EVENT WILL GARMIN BE LIABLE FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THE PRODUCT OR FROM DEFECTS IN THE PRODUCT SOME STATES DO NOT ALLOW THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU Garmin retains the exclusive right to repair or replace with a new or newly overhauled replacement product the product or software or offer a full refund of the purchase price at its sole discretion SUCH REMEDY WILL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY Online Auction Purchases Products purchased through online auctions are not eligible for warranty coverage Online auction confirmations are not accepted for warranty verification To obtain warranty service an original or copy of th
110. sage ranging from 118 to 136 MHz i e 76h to 88h A2h k KHz offset 25KHz 30h ranging from 000 to 975KHz in 25 KHz steps Standby frequency m MHz where m desired MHz frequency 30h ranging from 118 to 136 MHz 1 76h to 88h A2h KHz offset 25KHz 30h ranging from 000 to 975KHz in 25 KHz steps Transceiver status I Intercom no other status applicable R Normal receive M Monitor receive T Transmit active S Stuck mic F Comm failure Squelch setting ASCII 0 automatic 1 manual override SQ shown in upper left corner of COM active frequency COM channel spacing ASCII 25 25 KHz mode 83 8 33 KHz mode Active frequency 8 33 KHz offset ASCII 0 25 KHz frequency 000 1 first 8 33 KHz channel offset 005 2 second 8 33 KHz channel offset 010 3 third 8 33 KHz channel offset 015 Standby frequency 8 33 KHz offset 0 25 KHz frequency 000 1 first 8 33 KHz channel offset 005 2 second 8 33 KHz channel offset 010 3 third 8 33 KHz channel offset 015 PGRMC01G4LFR08303 lt chksm gt lt CR gt lt LF gt Active frequency is 119 100MHz the standby frequency 15 124 565M Hz unit is receiving squelch is automatic and the unit is in 8 33 KHz mode Note This message is output at a nominal one second rate or faster whenever the transceiver function or status changes GTR 225 GNC 255 TSO Installation Manual 190 01182
111. should be well removed from all projections engines and propellers The ground plane surface directly below the antenna should be a flat plane over as large an area as possible 18 inch square minimum The antenna should be mounted a minimum of six feet from any DME or other COM antennas and four feet from any ADF sense antennas The COM antenna should also be mounted as far apart as practical from the ELT antenna Some ELTs have exhibited re radiation problems that cause interference with other radios including GPS This can happen when the COM GTR GNC or any other 1 transmitting on certain frequencies such as 121 15 or 121 175 MHz which may cause the ELT output circuit to oscillate from the signal coming In on the ELT antenna coax If simultaneous use of two COM transceivers is desired split COM or simul comm the COM antennas should be spaced for maximum isolation A configuration of one topside antenna and one bottom side antenna Is recommended The GTR GNC does not require a transmit interlock but other COM radios such as the GNS 530W may require it for split COM operations 4 NOTE Canadian installations are required to meet Industry Canada specifications for maximum radiation as documented in Radio Specifications Standard 102 RSS 102 For more information about RF exposure and related Canadian regulatory compliance contact Manager Radio Equipment Standards Industry Canada 365 Laurier Avenue Ottawa Ontario KIA 0C8
112. signal levels this can be adjusted down to decrease the signal strength Note that the MIC 2 gain setting is dependent upon the MIC 1 gain setting T MIC GRIN HIC1 GRIN MICS ORIN 12 DB Figure 6 14 MIC Gain Page 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 6 9 GARMIN 6 4 3 2 COM RX Squelch The COM RX squelch page Figure 6 15 allows the installer to configure the squelch for the COM receiver The COM RX squelch adjusts the signal strength required to break squelch for the COM receiver The COM RX squelch is adjustable in the range of 0 zero to 100 The default value is zero Decreasing the value will allow squelch to be broken with low signal levels Increasing the value will require higher signal levels to break squelch COM Rx OLIELCH SQUELCH Figure 6 15 COM RX Squelch Page 6 4 3 3 Info The COM information page Figure 6 16 allows the installer to view and verify the COM board software version software part number hardware version boot version boot P N FPGA version and FPGA P N ec INFORMATION SW B 10 SH F H 1 MEHU ver 2 Figure 6 16 COM Information Page 6 4 3 4 Update 4 NOTE Garmin recommends the use a USB 2 0 compatible USB flash drive for updating databases and software on the GTR GNC FRE
113. t is not desired to utilize a remote switch 5 2 5 3 COM MIC 2 KEY COM MIC 2 KEY discrete input when pulled low allows the audio that is present on the COM MIC 2 AUDIO IN HI P2001 6 to be transmitted over the radio 5 2 5 4 COM REMOTE TRANSFER COM REMOTE TRANSFER discrete input may be used to flip flop between the active and standby COM frequencies A momentary low on this pin will load the standby COM frequency into the active COM frequency field and place the active frequency into the standby COM frequency field COM REMOTE TRANSFER input may be used for emergency operation of the COM transmitter If the switch 1 depressed for two seconds the active COM frequency changes to 121 500 MHz Once the emergency frequency is activated through COM REMOTE TRANSFER the GTR GNC transceiver ignores inputs from the front panel controls for COM selections only The pilot may exit this independent mode restoring COM selection control to the front panel knobs and keys by again depressing the switch for two seconds 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 5 9 GARMIN 5 2 5 5 REMOTE TUNE UP COM REMOTE TUNE UP discrete input may be used to scroll through a list of preset COM frequencies A momentary low on this pin will load the next preset frequency in the list into the standby COM frequency field 9 2 5 6 COM REMOTE TUNE DOWN COM REMOTE TUNE discrete input may be used to scroll
114. tallation GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 4 4 Rev B 1 GARMIN Table 4 4 Socket Contact Part Numbers Configuration Module 78 pin Connector P1001 P1001 P1005 Garmin P N t 00 00 Military P N N A M39029 58 360 ITT Cannon 010 2042 000 For configuration module pins ensure that the crimp tool is set to crimp 28 AWG wire indenter setting of 4 2 Contacts listed are not to be used for configuration module wiring Use the contacts supplied with the configuration module when installing configuration module wires in P1001 3 Non Garmin part numbers shown are not maintained by Garmin and are subject to change without notice 4 7 Equipment Mounting 4 7 1 Rack Installation Use the dimensions shown in Figure 1 to prepare the mounting holes for the GTR GNC unit You may also use the GTR GNC unit mounting rack itself as a template for drilling the mounting holes l A Figure 1 shows outline dimensions for the avionics rack for the various GTR GNC untts Install the rack in a rectangular 6 32 x 4 60 hole or gap between units in the instrument panel The lower front lip of the rack should be flush with or extend slightly beyond the finished aircraft panel NOTE If the front lip of the mounting rack is behind the surface of the aircraft panel the GTR GNC unit connectors may not fully engage See Figure C 7 for more information Ensure that no screw
115. than 1 0 V while sinking 20 mA The maximum off state leakage current with respect to ground is less than 10 DME COMMON must be pulled low to indicate to the GTR GNC that it 15 the device channeling the DME DME COMMON is considered active if either the voltage to ground 1 less than 1 9 V or the resistance to ground 15 less than 375 These inputs are considered inactive if the voltage to ground is 11 33 VDC Pins 37 40 41 42 43 45 47 33 54 and 56 are configured for 2 of 5 parallel DME tuning name Constr Pin 10 GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 5 14 Rev B A GARMIN 5 2 10 2 2 King Serial DME Tuning When SERIAL DME DATA or SERIAL DME CLOCK is asserted high and driving 360 load the driver output voltage is not less than 8 V and when asserted low is not greater than 10 mV SERIAL DME RNAV CH REQ SER DME RNAV MODE and DME COMMON are considered active if either the voltage to ground 1s less than 1 9 V or the resistance to ground is less than 375 Q These inputs are considered inactive if the voltage to ground 1s 11 33 VDC DME COMMON must be pulled low to indicate to the GTR GNC that it is the device channeling the DME Pins 18 19 20 and 41 are configured for King Serial DME tuning x 10 SERIAL DME RNAV MODE P2002 DME COMMON P2002 SERIAL DME DME REQUEST P2002 190 01182 02 GTR 225 GNC 255 TSO Installation Manual
116. the large knob to the next flag type and turn the small knob to change it to valid or invalid You can only select From To or Hidden as active not at the same time 4 Ensure the flags on the connected indicator function as intended 6 5 3 VOR Localizer Glideslope Indicator GNC Only The Test CDI VDI page Figure 6 25 of the NAV group allows the analog indicator connected to the GNC to be checked for proper wiring and operation TEST COI VOI MAX RIGHT Figure 6 25 Test CDI VDI Page If the GNC is interfaced to an analog indicator perform the following steps 1 Select the Test Analog CDI VDI page and press ENT Rotate the larger outer knob to select between CDI and VDI 2 the CDI selection verify correct operation of the lateral deviations on the indicator by using the corresponding selections Max Left Full Left Centered Full Right Max Right 3 Onthe VDI selection verify correct operation of the vertical deviations on the indicator by using the corresponding selections Max Up Full Up Centered Full Down Max Down GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 6 14 Rev B A GARMIN 6 5 4 Lighting Bus Interface Check aN CAUTION When 14 VDC or 28 VDC lighting buses are connected to the GTR GNC connection of the aircraft lighting bus to the incorrect input pins can cause damage to the GTR GNC Always start this test with the dimming bus at the lowest setting and slowly increase the brightness
117. to a 500Q load Less than 6 dB of variation between 350 and 2500 Hz In voice Audio Response mode an IDENT tone of 1020 Hz Ident Tone is attenuated at least 20 dB down mem The distortion in the receiver audio output does not exceed 10 at Audio Distortion all levels up to 100 mW Course Deviation Sensitivity Standard Deflection 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 1 5 GARMIN 1 3 7 Glideslope Specifications Characteristics Specifications Sensitivity 87 dBm or less for 60 of standard deflection Centering Accuracy 0 0 01183 ddm 0 10 14 mV The course deviation is 0091 when using the Glideslope Centering Test Signal as the RF frequency is varied Selectivity 17 kHz from the assigned channel At frequencies displaced by 132 kHz or greater the input signal is at least 60 dB down With a standard deflection FLY DOWN condition 90 Hz dominant the output 1 78 mV 7 8 mV With a standard deflection FLY UP condition 150 Hz dominant the output is 78 mV 7 8 mV The unit flags when Standard Deflection the level of a standard glideslope deviation test signal produces 50 or less of standard deflection of the deviation indicator 150 Hz modulation is absent 90 Hz modulation is absent 90 Hz and 150 Hz modulations are both absent RF signals are absent GTR 225 GNC 255 TSO Installation Manual 190 01182 02 Page 1 6 Rev B A GARM
118. valid information is Flag IN VIEW the TO FROM output is 0 10 mV DC Connector Pin TO w 2 Ow 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page 5 11 GARMIN 5 2 8 1 4 Flag Pin 10 GLIDESLOPE FLAG P2002 GLIDESLOPE FLAG P2002 5 2 8 15 OBS VOR OBS ROTOR Cand H are a buffered 400 Hz output that is Intended to drive the OBS rotors VOR OBS STATOR D and VOR OBS STATOR F are each phase and amplitude shifted version of the VOR ROTOR C output Each pair is intended to read one of the two windings of the indicator s OBS stator x inam Connector Pin 10 PAX 9 _ VOR OSB STATOR E GND P2002 d o VOR OBS STATOR F P2002 VOR OBS STATOR G GND P2002 o 5 2 8 1 6 VOR LOC COMPOSITE With a standard VOR test signal applied VOR LOC COMPOSITE OUT is 0 5 0 1 Vrms into a 10 kQ load With a standard Localizer centering test signal applied VOR LOC COMPOSITE OUT 15 0 350 0 05 Vrms into a 10 kQ load Connector COMPOSITE OUT P2002 8 Out 5 2 8 1 7 GLIDESLOPE COMPOSITE With a standard glideslope test signal applied GLIDESLOPE COMPOSITE OUT is 0 350 0 05 Vrms into a 10 kQ load Connector Pm VO GLIDESLOPE COMPOSITE OUT P2002 5 2 8 1 8 NAV ILS ENERGIZE The driver output voltage Is not more th
119. yte last waypoint flag is set route sequence number is 1 CR ASCII carriage return character OD hex LF ASCII line feed character hex 190 01182 02 GTR 225 GNC 255 TSO Installation Manual Rev B Page B 3 A GARMIN Table B 2 describes the Type 2 aviation output sentence item designator id sequence number seq waypoint identifier wpt waypoint latitude lat waypoint longitude lon and magnetic variation at waypoint mvar fields Table B 2 Type 2 Aviation Output Sentence Format Format character 77 hex Two ASCII numeric characters representing route sequence number of waypoint 01 to 31 x a n n n n nm undefined 1 if last waypoint in route 1 if active to waypoint route sequence number of waypoint unsigned binary Destination waypoint identifier will be blank filled on right if less than 5 characters in identifier 0 north 1 south ddddddd latitude degrees unsigned binary XX undefined mmmmmm latitude minutes unsigned binary X undefined hhhhhhh hundredths of latitude minutes unsigned binary S 0 east or 1 west XXXXXXX undefined dddddddd longitude degrees unsigned binary XX undefined mmmmmm latitude minutes unsigned binary X undefined hhhhhhh hundredths of latitude minutes unsigned binary Two s complement binary in 16ths of degrees mvar 1 2 Easterly variation is positive MSB output f

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