GMA 340 AUDIO PANEL installation Manual
Contents
1. TEL RINGER IN Telephone Audio TEL RINGER RETURN PILOT MIC RETURN PILOT MIC IN e PILOT MIC KEY PASS HEADSET RETURN PASS HEADSET R lt D up to 4 jacks PASS HEADSET L wired parallel EXT WHITE LAMP A EXT Indicator EXT BLUE LAMP O EXT AMBER LAMP M FLT CTRL System MIDDLE MKR SENS GND LUG y MKR ANT Q gt Marker Beacon Antenna MKR ANT RETURN MASQ INH See note 14 NC GMA 340 Installation Manual 190 00149 01 10 11 12 NOTES PERTAINING TO J1 AND J2 UNLESS OTHERWISE INDICATED ALL SHIELDS MUST BE TERMINATED AT THE GMA 340 END ONLY ALL WIRE SIZE SHOULD BE AWG 24 OR LARGER TEFLON INSULATED EXCEPT FOR THE FOLLOWING J2 PINS 8 9 10 11 AWG 22 TEFLON INSULATED J2 PINS 43 44 AWG 22 TEFLON INSULATED SOME COMMUNICATION TRANSCEIVERS REQUIRE THEIR SPEAKER OUTPUT TO BE LOADED FOR PROPER OPERATION THE GMA 340 PROVIDES INTERNAL DUMMY LOADS FOR THIS PURPOSE CONNECT ONLY IF REQUIRED REFER TO TRANSCEIVER DOCUMENTATION CONNECT LIGHTING BUS AS SHOWN IN THE FOLLOWING TABLE VOLTAGE HIGH SIDE OF BUS LOW SIDE OF BUS 28V LIGHTING J2 PIN 7 J2 PINS 5 AND 6 14V LIGHTING J2 PINS 6 AND 7 J2 PIN 5 ALL HEADSET MICROPHONE AND MUSIC PHONE PLUGS MUST BE ELECTRICALLY ISOLATED FROM GROUND2. The marker beacon audio level 15 aligned at the factory to produce its rated audio output However the output level 15 adjustable through an access hole in top cover of the unit see figure 2 3 The GMA 340 s marker beacon receiver controls are located on the left side of the front panel 1 through 4 The SENS button 4 selects either high or low sensitivity as indicated by the HI or LO LED being Ht Low sensitivity is used on ILS approaches while high sensitivity allows operation over airway markers or to get an earlier indication of nearing the outer marker during an approach The marker audio is selected initially by pressing the MKR mute button 2 If no marker beacon signal 15 received then pressing again will deselect the marker audio This operation is similar to selecting any other audio source on the GMA 340 However if the second button press occurs while a marker beacon signal 15 received then the marker audio is muted but not deselected The button s LED will remain lit to indicate that the source 15 still selected The GMA 340 s SmartMute function then monitors the marker signal and automatically unmutes the audio when the current marker signal 1s no longer being received In all cases the marker beacon LED s operate independently of any audio selection and cannot be turned off The GMA 340 can drive external marker lamps if required Maximum source current is 125 mA 8 Vdc max Page 3 6 GMA 34
3. 20 2 Fallsaie Operation 2 0 gt Transceiver Operational Checgkku DCUM MIR 2 64 Intercom system IC 5 205 Aeta Receivers un au te S 2 536 SINTUSIOSS 2E O tA GMA 340 Installation Manual 190 00149 01 SECTION 3 OPERATION PARAGRAPH PAGE M I MUI MEM SDN M MM NEMINEM ME 3 oJ Front Panel e to e E ao LEM 3 2412 and Falate 3 2 3 2 3 2 SRS SPI COM mm 3 3 3 3 Radios amp Navigation ia it tote o 3 3 DLS Speaket OUMU uu u k i tin aa dere 3 3 PA ell 111 61 M 3 4 S110 Auxillary Entertainment Mputs oso o A 3 4 Sub duse iioc ehe 3 4 12 Moo OO D 3 5 VIAL MOD us u MI 3 6 APPENDIX A CERTIFICATION DOCUMENTS CON TINGE DA TR ORT TINIE S i uuu u uta v am 1 2 ENVIRONMENTAL QUALIFICATION FORM
4. A 4 APPENDIX B INSTALLATION DRAWINGS GENERA 1 APPENDIX STC PERMISSION ONE GIU Did det 1 Page ii GMA 340 Installation Manual Rev K 190 00149 01 LIST OFILLUSTRATIONS FIGURE PAGE 2 l E 2 3 2 2 AUDIO SEHBED TERMINA TIO Xu 2 5 2 9 ACCESS HOE LOCATION 2 9 2 41 SAO FRONT u u k ua aa 3 1 O TOOUTEINEDEAWINC uuu da B 3 B2 CONNBECIORZIRACK KIT DRAWING us I REDI B 5 B3 GMA 340 RECOMMENDED PANEL CUTOUT DIMENSIONS B 7 B JLINIEBRCONNEGI WIRING DIAGRAM B 9 Bd 12 INTERCONNECT WIRING DIAGRAM B 11 B6 JLINTERCONNECT WIRING DIAGRAM uu uuu uu asane i aa ai B 13 BY JZINIERCONNEGEWIRENCEDDAGHIA MI p u coa u secun ouo B 15 LIST OF TABLES Table PAGE QV Jl and 42 uuu u Uni n 2 4 2 2 Recommended uu w 2 5 GMA 340 Installation Manual Page iii 190 00149 01 Rev K GMA 340 HARDWARE MOD LEVEL HISTORY The following table identifies hardware modification Mod Levels for the GMA 340 audio panel Mod Levels are listed with the associated service bulletin number service bulletin date
5. 06 24 02 Add 20 dB Music Volume Control and mod history 18443 Page A GMA 340 Installation Manual Rev K 190 00149 01 TABLE OF CONTENTS SECTION 1 GENERAL INFORMATION PARAGRAPH LL INIRODOUC HON ique aun e molas eMe vata tud due ord L2 GENEISAL DESCRIPLION etn ie aue WY SPECIFICA MON uuu E 1 5 JINSTALEATION ACCESSORIES ss Le S3XNDDTIIONAD EQUIPMEN P PREQUIRED rit br esee neon Io uuu a u ae is eie Eus SECTION 2 INSTALLATION 2 1 INTRODUCTION Pm tes te M 2 2 UNPACKING AND INSPECTING EQUIPMENT 2 27 ANTENNA AINSTALLA TION i died vede giunta 2 951 Eocatigit onsideranlons 42 35 OMIM NEM MEME dE 2 9 2 JAmteniaIstallatioEl y s ti oet adeo Pe 2 33 Anena Cable Install 2 3 4 Installation Approval Considerations for Pressurized 24 ENS LADEN u u pH NE E P E 2 3 CONNEC HONS S ORO INE DIEN 2 5 MOC t On u 2 5 2 Audio Shield 2 56 POSPINSIADISATIONCIHECKOL
6. GMA 340 AUDIO PANEL GMA 340 GMA 340H GMA 340 DUAL ADF GARMIN i i GMA 340 MKR coMi COM2 COM3 NAV1 NAV2 DME ADF lusu MUTE so Hi 4 SOME CABIN AUDIO ICS ISOLATION voc Screw x COPILOT GMA 340 COM1 COM2 COM3 1 2 ADF1 2 TEST MUTE S rr COM2 SPKR ICS ISOLATION vo MIC CREW ess COPILOT GMA 340 and GMA 340 Dual ADF Shown GARMIN International Inc 1200 E 151 Street Olathe KS 66062 USA 190 00149 01 Revision K May 2002 Copyright 2002 GARMIN Ltd 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
7. MASQ INH See note 14 NC GMA 340 Installation Manual 190 00149 01 Marker Beacon Antenna e H PTT 4 jacks in parallel 10 11 12 NOTES PERTAINING TO J1 AND J2 UNLESS OTHERWISE INDICATED ALL SHIELDS MUST BE TERMINATED AT THE GMA 340 END ONLY ALL WIRE SIZE SHOULD BE AWG 24 OR LARGER TEFLON INSULATED EXCEPT FOR THE FOLLOWING J2 PINS 8 9 10 11 AWG 22 TEFLON INSULATED J2 PINS 48 44 AWG 22 TEFLON INSULATED SOME COMMUNICATION TRANSCEIVERS REQUIRE THEIR SPEAKER OUTPUT TO BE LOADED FOR PROPER OPERATION THE GMA 340 PROVIDES INTERNAL DUMMY LOADS FOR THIS PURPOSE CONNECT ONLY IF REQUIRED REFER TO TRANSCEIVER DOCUMENTATION CONNECT LIGHTING BUS AS SHOWN IN THE FOLLOWING TABLE VOLTAGE HIGH SIDE OF BUS LOW SIDE OF BUS 28V LIGHTING J2 PIN 7 J2 PINS 5 AND 6 14V LIGHTING J2 PINS 6 AND 7 J2 PIN 5 ALL HEADSET MICROPHONE AND MUSIC PHONE PLUGS MUST BE ELECTRICALLY ISOLATED FROM GROUND THIS MAY REQUIRE THE USE OF INSULATING WASHERS WHEN MOUNTING THE PHONE PLUGS ADDITIONALLY THE SPEAKER RETURN MUST BE ISOLATED FROM GROUND PA MUTE IS AN OUTPUT FROM THE GMA 340 THAT IS PULLED LOW WHEN ACTIVE IT IS USED TO TRIGGER THE MUTE FUNCTION ON AN EXTERNAL PA SYSTEM NORMALLY ANY ICS INTERCOM ACTIVITY WILL CAUSE THE MUSIC SOURCE TO BE MUTED IF THIS IS NOT DESIRED THEN J2 PIN 13 MUST BE CONNECTED TO J2 PIN 14 EITHER PERMANENTLY OR VIA A SWITCH J2 PIN 17 8 OHM SELECT IS ONLY FOR USE IN IN
8. or MKR 2 see MKR beacon operation selects that audio source A second button press deselects the audio source In addition the GMA 340 provides inputs for an unswitched aircraft radio TEL RINGER and an unmuted unswitched aircraft radio ALT WRN 3 1 8 Speaker Output Pressing the SPKR button 12 selects Aircraft radios over the cabin speaker The speaker output is muted when a COM microphone is keyed Speaker level is adjustable through an access hole in the top of the unit see figure 2 3 GMA 340 Installation Manual Page 3 3 190 00149 01 Rev K 3 1 9 PA Function The PA mode is activated by pressing the PA button 11 Then when either the pilot s or copilot s microphone is keyed the corresponding mic audio 1s heard over the cabin speaker If the SPKR button 12 15 also active then any selected speaker audio is muted while the microphone is keyed The SPKR button does not have to be previously active in order to use the PA function Pilot and copilot PA microphone speaker levels are adjustable through an access hole in the top of the unit see figure 2 3 3 1 10 Auxiliary Entertainment Inputs The GMA 340 and 340H provide two stereo entertainment inputs MUSIC 1 and MUSIC 2 The 340 Dual ADF has only MUSIC 1 MUSIC 1 is soft muted during all aircraft radio activity and normally during ICS activity MUSIC 2 is a non muted input These inputs are compatible with popular portable entertainment devices such as cass
9. 79 p N No 81 Y OVE 19 n6id E E Y i Qerq p g c g 9924 X 93 GMA 340 nstallation Manual 190 00149 01 Figure B2 011 00405 00 CONNECTOR RACK KIT PART NUMBER 1 115 00262 00 2 125 00040 00 5 211 60234 08 4 211 63234 12 5 330 00185 44 6 330 00220 25 7 125 00046 00 8 210 00036 07 9 115 00261 00 HOWN 336 00021 00 CONNECTOR RACK KIT DRAWING DESCRIPTION INSTALL RACK CONNECTOR PLATE SCREW Z 0x 250 PHP SS P SCREW 500 FLHP SS P CONN HI DENS D SUB MIL CRP BACKSHELL D SUB METAL NUTPLATE D SUB 25 NUT HEX 6 32 SS CAPTIVE NUT COVER CONT PIN MIL CRIMP SIZE 22D Page B 5 Page B 6 blank Rev die 6 50 60 0 STACK CUTOUT RACK INSTALLED 6 30 160 0 i FROM FRONT OF AIRCRAFT PANEL 4 OPTION 2 RADIO CUTOU RACK INSTALLED FROM FRONT OF AIRCRAFT PANEL a uw ON 2 i NOTES RADIO CUTOUT RACK INSTALLED 1 20 5 1 DIMENSI
10. COM 2 KEY j lt b gt DEL D D X D lt D IX p lt gt 1 lt gt 340 DUAL ADF COM 1 SPKR LOAD COM 1 SPKR LOAD RETURN See note 3 COM 1 IN 9 COM 1 Transceiver COM 1 RETURN COM 1 MIC COM 2 SPKR LOAD COM 2 SPKR LOAD RETURN See note 3 COM 2 IN DE COM 2 Transceiver COM 2 RETURN COM 2 MIC COM 3 SPKR LOAD COM 3 SPKR LOAD 988 1016 3 DC COM 3 IN COM 3 COM 3 RETURN Transceiver COM 3 MIC COM 3 KEY NAV 1 IN NAV 1 Radio NAV 1 RETURN NAV 2 IN NAV 2 Radio NAV 2 RETURN ADF 1 IN ADF 1 Radio ADF 1 RETURN ADF 2 IN ADF 2 RETURN ADF 2 Radio ALT WRN IN Altitude Warning Audio ALT WRN RETURN TEL RINGER IN TEL RINGER RETURN Telephone Audio PILOT MIC RETURN PILOT MIC IN PILOT MIC KEY M PASS HEADSET RETURN PASS HEADSET R PASS HEADSET L up to g wired EXT WHITE LAMP A EXT BLUE LAMP O EXT Indicator EXT AMBER LAMP M MIDDLE MKR SENS GND LUG FLT CTRL System MKR ANT Q MKR ANT RETURN
11. Pilot Intercom System ICS Volume Pilot ICS Voice Activated VOX Intercom Squelch Level Copilot and Passenger ICS Volume Control Pull out for Passenger Volume Copilot and Passenger VOX Intercom Squelch Level ne aper Crew Isolation Intercom Mode Button 10 Pilot Isolation Intercom Mode Button ll Passenger Address PA Function Button 12 Speaker Function Button DME in Dual ADF GMA 340 Installation Manual Page 3 1 190 00149 01 Rev K 13 Transceiver Audio Selector Buttons COM 1 COM 2 COM 3 14 Transmitter Audio Mic Selection Buttons 15 Split COM Button SPKR in Dual ADF 16 Aircraft Radio Audio Selection Buttons NA V1 NAV2 DME ADF 17 Annunciator Test Button 18 Locking Screw Access 19 Photocell Automatic Annunciator Dimming 3 12 On Off and Failsafe Operation The GMA 340 15 powered off when the left small knob figure 3 1 item 5 15 rotated fully CCW into detent To turn the unit on rotate the knob clockwise past the click The knob then functions as the pilot s ICS volume control A failsafe circuit connects the pilot s headset and microphone directly to COM 1 in case the power 15 interrupted or the unit is turned off Refer to the note in paragraph 2 6 2 3 1 3 Lighting The intensity of the button annunciators and marker beacon LED s are controlled automatically by a built in photocell 19 on the front panel Nomenclature backlighting 15 controlled by the aircraft dimmer bus
12. THIS MAY REQUIRE THE USE OF INSULATING WASHERS WHEN MOUNTING THE PHONE PLUGS ADDITIONALLY THE SPEAKER RETURN MUST BE ISOLATED FROM GROUND PA MUTE IS AN OUTPUT FROM THE GMA 340 THAT IS PULLED LOW WHEN ACTIVE IT IS USED TO TRIGGER THE MUTE FUNCTION ON AN EXTERNAL PA SYSTEM NORMALLY ANY ICS INTERCOM ACTIVITY WILL CAUSE THE MUSIC 1 SOURCE TO BE MUTED IF THIS IS NOT DESIRED THEN J2 PIN 13 MUST BE CONNECTED TO J2 PIN 14 EITHER PERMANENTLY OR VIA A SWITCH J2 PIN 17 8 OHM SELECT IS ONLY FOR USE IN INSTALLATIONS WHERE AN 8 OHM CABIN SPEAKER IS INSTALLED THE FUNCTION ALLOWS THE SAME POWER TO BE DELIVERED TO AN 8 OHM SPEAKER AS WOULD NORMALLY BE DELIVERED TO A 4 OHM SPEAKER IF AN 8 OHM SPEAKER IS USED AND THE SPEAKER VOLUME IS ACCEPTABLE THEN THIS PIN SHOULD BE LEFT OPEN IF AN 8 OHM CABIN SPEAKER IS USED BUT MORE SPEAKER VOLUME IS DESIRED THEN J2 PIN 17 MUST BE TIED TO GROUND AND THE SPEAKER VOLUME SHOULD BE READJUSTED DO NOT GROUND J2 PIN 17 INA 4 OHM CABIN SPEAKER INSTALLATION J2 PIN 19 TONE ENABLE CAN BE LEFT OPEN OR TIED TO GROUND IF TIED TO GROUND THEN SHORT AUDIBLE TONE WILL BE HEARD IN THE PILOT AND COPILOT HEADSETS EACH TIME A BUTTON IS PRESSED IF LEFT OPEN NO IS HEARD USE COAX MEETING THE APPLICABLE AVIATION REGULATION FOR THE MARKER BEACON ANTENNA CABLE WHEN ROUTING THE MARKER BEACON ANTENNA CABLE AVOID SHARP CORNERS AND ROUTE AWAY FROM HIGH CURRENT WIRING AND ANY TRANSMITTER ANTENNA CABLES PINS
13. 31 AND 32 OF J1 ARE UNSWITCHED UNMUTED INPUTS PINS 43 AND 44 OF J1 ARE UNSWITCHED INPUTS J2 PINS 10 AND 11 SHOULD BE CONNECTED DIRECTLY TO THE AIRFRAME USING MINIMUM WIRE LENGTH Figure B4 J1 INTERCONNECT WIRING DIAGRAM Page B 9 Page B 10 blank Rev 2g DE D lt Db lt D gt lt 340 340H PILOT HEADSET RETURN PILOT HEADSET R PILOT HEADSET L COPILOT HEADSET RETURN COPILOT HEADSET R COPILOT HEADSET L COPILOT MIC RETURN COPILOT MIC IN COPILOT MIC KEY PASS 1 MIC RETURN PASS 1 MIC PASS 2 MIC RETURN C D PASS 2 MIC PASS 3 MIC RETURN PASS 3 MIC PASS 4 MIC RETURN PASS 4 MIC MUSIC 1 RETURN MUSIC 1 R MUSIC 1 L MUSIC 2 RETURN MUSIC 2 R MUSIC 2 L EYE e T EJ 10 LE SPKR OUT G DK _ D L D 10 11 15 22 29 30 SPKR RETURN 2 ICS MUTE INHIBIT See note 7 ICS MUTE INHIBIT RETURN C D ub K Cabin Speaker Mute Trigger to EXT PA See note 6 GMA 340 Installation Manual 190 00149 01 SWAP SWAP RETURN PAMUTE 8 OHM SELECT See note 8 TONE ENABLE See note 9 RESERVED do not use AIRCRAFT PW
14. Continued Airworthiness date e Assistance Flight Standards Inspectors have the resources to respond to questions regarding the ICA Implementation and Record Keeping For major alterations performed in accordance with FAA field approval policy the owner operator operating under Part 91 1s responsible for ensuring that the ICA 1s made part of the applicable section 91 409 inspection program for their aircraft This is accomplished when a maintenance entry is made in the aircraft s maintenance record in accordance with section 43 9 This entry records the major alteration and identifies the original ICA location e g Block 8 of FAA Form 337 dated along with a statement that the ICA 15 now part of the aircraft s inspection maintenance requirements GMA 340 Installation Manual Page A 3 190 00149 01 Rev K A 2 ENVIRONMENTAL QUALIFICATION FORM NOMENCLATURE GMA 340 Audio Panel TYPE MODEL PART NO 010 00152 which includes all 011 00401 340H 15 01 Dual ADF 15 20 TSO C50c TSO C35d Class A JTSO C50c JTSO 2C35d MANUFACTURER S SPECIFICATION AND OR OTHER APPLICABLE SPECIFICATION 004 00054 00 MANUFACTURER GARMIN International ADDRESS 1200 E 151st St Olathe Kansas 66062 CONDITIONS SECTION DESCRIPTION OF CONDUCTED TESTS Temperature and Altitude 4 0 Equipment tested to Category AIDI except as noted Low Tempe
15. ONLY BE MUTED WHEN THE PILOT TRANSMITS 16 2 STAGE MOMENTARY SWITCH FIRST DETENT KEYED INTERCOM SECOND DETENT MICROPHONE AUDIO AND PTT ACTIVE PROVIDES KEYED INTERCOM IN HIGH NOISE ENVIRONMENTS 2 FIRST DETENT ICS MIC i e MICROPHONE SECOND DETENT FULL ACTIVATION TX MICROPHONE LO MIC KEY MIC RETURN 17 CONNECT TO GROUND FOR TIMES TEN 20 dB GAIN OR INSTALL SWITCH TO SELECT BETWEEN UNITY GAIN 0 dB AND TIMES TEN GAIN 20 dB FOR MUSIC1 THIS FUNCTION APPLIES ONLY TO UNITS WITH MOD 5 INCORPORATED Figure B7 J2 INTERCONNECT WIRING DIAGRAM Page B 15 Page B 16 blank Rev K APPENDIX C SIC PERMISSION C 1 GENERAL Consistent with N8110 69 or Order 8110 4 Aviation Authority approved installers are hereby granted permission to use SA00710WI data to modify aircraft GMA 340 Installation Manual Page C 1 190 00149 01 Rev K States of America Bepartment of Transportation eheral Abiation Administration Supplemental Type Certificate au RADOT10WT Vass 2 Garmin International 1200 E 514 St Olathe KS 66062 m ad Aarmen ha the of 3 of litte Civil Air Dino Number AIS Mont 3 Installation of GARMIN GMA 340 Audio Panel in accordance with GARMIN Corporation Master Drawing List Drawing 005 00083 00 Revision A da
16. See installation wiring diagrams in Appendix B for guidance on connecting the dimmer bus to the GMA 340 3 1 4 Transceivers Audio level is controlled by the selected com radio volume control selection of either COM 1 COM 2 or COM 3 13 for both MIC and audio source 1s accomplished by pressing either COM 1 MIC COM 2 MIC or COM 3 MIC 14 The active com audio is always heard on the headphones Each audio source can be selected independently by pressing COM 1 COM 2 or COM 3 13 When selected in this way they remain active as audio sources independently of which transceiver has been selected as the active microphone source When a microphone 15 keyed the active transceiver s MIC button LED blinks approximately once per second to indicate the transmitter 1s active When no aircraft radio activity 15 detected by the GMA 340 the amount of ambient background noise from the radios 15 further reduced by the MASQ circuit This processing 15 also applied to the Nav radios described in 3 1 7 If this feature is not desired then J1 pin 16 MASQ INH should be tied to ground Page 3 2 GMA 340 Installation Manual Rev K 190 00149 01 3 1 5 Split Com Not Applicable to Dual ADF Pressing the COM 1 2 button 15 activates the split com function While this mode 15 active COM 2 15 dedicated solely to the copilot as a MIC audio source while COM 1 15 dedicated to pilot as a MIC audio source The pilot can still listen to CO
17. and the purpose of the modification The table is current at the time of publication of this manual see date on front cover and 15 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 PURPOSE OF MODIFICATION LEVEL BULLETIN BULLETIN NUMBER DATE 2 2 01 Configurable option to mute other com audios when transmitting 2 6 13 01 Provides times ten 20 dB for entertainment music system 3 5 17 02 Provides correct marker beacon output loading for interface with a Sandel SN3308 EHSI 0209 5 2 02 Provides failsafe operation when monophonic headsets are used in a stereo installation I 5 0210 5 2 02 Provides switchable On OFF times ten gain 20 dB for entertainment music system 0212 Filter capacitors added to prevent power supply noise from interfering with a GDL 49 Not released at time of publication Page iv GMA 340 Installation Manual Rev K 190 00149 01 SECTION 1 GENERAL INFORMATION 11 INTRODUCTION This manual provides the installation and operating instructions for the GARMIN GMA 340 GMA 340H and GMA 340 Dual ADF Audio Panel Reference to GMA 340 throughout this manual refers to all versions of the unit Information pertaining to the maintenance of the unit can be f
18. checkout of the GMA 340 Audio Panel Installation of the GMA 340 will differ according to equipment location and other factors Cabling will be fabricated by the installing agency to fit these various requirements Appendix B contains interconnect wiring diagrams mounting dimensions and information pertaining to installation Each installation shall be accomplished to meet the requirements of FAA AC 43 13 2 2 2 UNPACKING AND INSPECTING EQUIPMENT Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred during shipment If the unit is damaged notify the carrier and file a claim To justify a claim save the original shipping container and all packing materials Do not return the unit to GARMIN until the carrier has authorized the claim Retain the original shipping containers for storage If the original containers are not available a separate cardboard container should be prepared that 15 large enough to accommodate sufficient packing material to prevent movement 2 3 ANTENNA INSTALLATION 2 3 1 Location Considerations The marker beacon antenna should be mounted on a flat surface on the underside of the aircraft Mount the antenna so that there is a minimum of structure between it and the ground radio stations Locate as far away as possible from transmitter antennas Best results with split COM mode will be obtained when the COM 1 and COM 2 antennas are mounted on opposite sides of the
19. exercising the installed transceivers microphone microphone key and audio over the headphones and speaker 2 Verify that communications are loud and clear and PTT operation is correct 2 6 4 Intercom System ICS Check NOTE If a monaural headset is used in one position no damage will occur if plugging into a stereo jack In the case of passenger positions any stereo listener will lose one channel when another passenger plugs In a mono headset Set the intercom to the ALL mode Crew 9 and Pilot 10 LED s off 2 Plug in headsets at each ICS position NOTE For helicopter operation using a two stage Intercom PTT switch prior to using the keyed intercom mode the VOX level should be set by adjusting the VOX knob while the first detent is actuated and held 3 Adjust squelch 8 and volume 7 for each position and verify that the ICS 15 working properly Check Pilot and Copilot ICS positions for isolation and proper operation of volume and squelch controls 5 6 7 and 8 5 Press the PA button 11 Verify that microphone audio 15 heard over the speaker GMA 340 Installation Manual Page 2 7 190 00149 01 Rev K 2 6 5 Aircraft Receivers Check 1 Select the audio source corresponding to each installed avionics unit and check for audio over the headsets 2 Check for Pilot Copilot audio isolation when pressing the COM 1 2 button 15 Not applicable to Dual ADF 3 Press the SPKR button 12 and verify that any s
20. hear only left channel from the GMA 340 in both ears If a monaural headset 15 used at one of the passenger positions any other passenger listening on a stereo headset will hear audio in their left ear only unless their headset has a stereo mono switch and 1415 set for mono In units without Mod 4 incorporated if the pilot uses a monaural headset in a stereo jack no audio will be heard during failsafe operation When using a monaural headset the pilot s jack must be equipped with a stereo mono switch and it must be set to the mono position for proper failsafe operation If Mod 4 1s incorporated and the pilot uses a stereo headset in a stereo jack audio will be heard in the left channel only during failsafe operation GMA 340 Installation Manual 190 00149 01 Page 3 5 Rev K 3 1 13 Marker Beacon Receiver The marker beacon 15 part of an ILS system and in certain instances used to identify an airway In addition to the normal marker beacon functions the GMA 340 provides an audio muting function The LED s illuminate and an associated keyed tone 15 heard when MKR audio 15 selected when the aircraft passes over a 75 MHz marker beacon transmitter The lights and audio keying for ILS approach operation are summarized below Audio Audio Keying LED Actuated Frequency 400 Hz EH 1300 Hz o o HH Amber Middle 3000 Hz oooooooooo0 White Airway Inner
21. strictly prohibited 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 this and other GARMIN products GARMIN International Inc 1200 E 151 Street Olathe KS 66062 USA Telephone 913 397 8200 Dealer Line 1 800 800 1420 Web Site Address www garmin com INFORMATION SUBJECT TO EXPORT CONTROL LAWS This document may contain information which is 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 US 1 000 000 under Section 2410 of the Export Administration Act of 1979 Include this notice with any reproduced portion of this document RECORD OF REVISIONS Revision Revision Description ECO Date 912798 Preliminary Release B 03 05 98 Add Music Trip Level Adjustment 8512 7 9 01599 Add 052899 Updated Document n2 F 05 26 00 Redraw 144 ud Mode Connections Helicopter PTT Switch H 105 18 01 Added Dual ADF Version 15847 12 18 01 Add mono stereo failsafe note 17123
22. transmits and receives on COMI e COM swap function e indication SmartMute marker audio muting e Speaker output for radios or PA function e Power off fail safe to connect Pilot mic and Headset to COM 1 if unit is turned off 1 3 SPECIFICATIONS SPECIFICATION CHARACTERISTIC TSO Compliance TSO C50c C35d JTSO C50c and JTSO 2C35d using DO 160C DO 170 and DO 143 Temperature Range 20 C to 55 C Weight Unit Only 1 2 Ibs 0 6 kg Installed with rack and connectors 1 7 165 0 8 kg Physical Dimensions Bezel Height 1 30 inches 33 mm Bezel Width 6 29 inches 160 mm Rack Height Dimple to Dimple 1 33 inches 34 mm Rack Width 6 30 inches 160 mm Depth Behind Panel with Connectors measured from face of aircraft panel to rear of connector backshells 7 12 inches 181 mm Power Requirements Supply Voltage 11 0 to 33 0 VDC Operating Current 2 2 A normal operation 13 8 V speaker on Altitude 50 000 Feet Audio Panel Transceiver inputs 3 Receiver inputs 5 6 m Dual ADF version Unswitched inputs 2 Input impedance 50002 8000 DME input in Dual ADF Input isolation 60 dB minimum Special functions Fail safe operation MASQ processing Page 1 2 Rev K GMA 340 Installation Manual 190 00149 01 SPECIFICATION CHARACTERISTIC Intercom Positions 6 pilot copilot 4 passengers Volume controls 3 pilot copilot pa
23. 0 Installation Manual Rev K 190 00149 01 APPENDIX A CERTIFICATION DOCUMENTS A 1 CONTINUED AIRWORTHINESS This section provides assistance to the installing agency in preparing Instructions for Continued Airworthiness ICA in response to Bulletin Number HBAW 98 18 Checklist for Instructions for Continued Airworthiness for Major Alterations Approved Under the Field Approval Process effective 10 7 98 Aviation Authority approved installers are hereby granted permission to reference appropriate service instructions and excerpts from this Installation Manual to accomplish the Instructions for Continued Airworthiness This permission does not construe suitability of the documents It is the applicant s responsibility to determine the suitability of the documents for the ICA Following is suggested ICA for a GARMIN GMA 340 Audio Panel installation Some of the checklist items do not apply in which case they should be marked N A Not Applicable In this sample square braces are used to indicate instances where explicit words should be substituted INSTRUCTIONS FOR CONTINUED AIRWORTHINESS GARMIN GMA 340 AUDIO PANEL 1 Introduction Aircraft that has been altered Registration N number Make Model and Serial Number Content Scope Purpose and Arrangement This document identifies the Instructions for Continued Airworthiness for the modification of the above aircraft by installation of a GARMIN GMA 340 Audio Panel Applicabili
24. 1 5 12 17 19 18 340 DUALADF PILOT HEADSET RETURN PILOT HEADSET R PILOT HEADSET L COPILOT HEADSET RETURN COPILOT HEADSET R COPILOT HEADSET L COPILOT MIC RETURN COPILOT MIC IN COPILOT MIC KEY PASS 1 MIC RETURN PASS 1 MIC PASS 2 MIC RETURN PASS 2 MIC PASS 3 MIC RETURN PASS 3 MIC PASS 4 MIC RETURN PASS 4 MIC MUSIC 1 RETURN MUSIC 1 R MUSIC 1 L DME RETURN DME Radio DME IN SPKR OUT SPKR RETURN ICS MUTE INHIBIT See note 7 ICS MUTE INHIBIT RETURN SWAP e SWAP RETURN ETUR 1 Cabin Speaker MUTE 8 OHM SELECT Mute Trigger to EXT PA See note 6 See note 8 TONE ENABLE RESERVED do not use AIRCRAFT PWR AIRCRAFT PWR Cn See note 9 AIRCRAFT GND Aircraft Power Buss AIRCRAFT GND 14V LGT LO 28V LGT LO x See note 12 See note 4 14V LGT HI 28V LGT LO 14V LGT HI 28V LGT HI See note 4 See note 4 HI MUSIC GAIN SELECT NC NC NC See note 17 See note 15 COM TX MUTE GMA 340 Installation Manual 190 00149 01 NOTES PERTAINING J1 AND 42 Cont d NOTE 13A APPLIES TO GMA 340 UNITS WITHOUT MOD 4 13A IF GENERAL AVIATION MONOPHONIC HEADSETS HAVING TRUE MONOPHONIC PLUGS ARE USED IN AN INSTALLATION HAVING STEREO HEADPHONE JACK
25. 40 is FAA TSO approved to C50c and C35d and JTSO approved to C50c and 2C35d Also standard is the marker beacon receiver with dual sensitivity and audio muting with automatic re arming 14V or 28V operation including the full rated range of headphone and speaker output power is available without the requirement for external voltage converters or dropping resistors The GMA 340 is the standard version audio panel as pictured on the cover of this manual The GMA 340H is the helicopter version in which the pilot and co pilot control knobs on the front panel are reversed The GMA 340 Dual ADF version also pictured on the cover accepts two ADF audio inputs Features Summary e User friendly intuitive front panel layout LED s indicate selected function e Six position intercom pilot copilot four passengers e Three stereo headset amplifiers one for pilot one for copilot and one for the passengers e Two stereo music source inputs one in Dual ADF version e Three selectable intercom operational modes e Selectable aural pushbutton annunciation beep for the crew GMA 340 Installation Manual Page 1 1 190 00149 01 Rev K Independent pilot copilot and passenger volume controls e Individual VOX circuits for each of six 6 mic inputs e Automatic selection of radio audio source when corresponding mic is selected MASQ Processing e Split COM transceiver function Copilot may transmit and receive on COM2 while pilot
26. M 3 NAV 1 NAV 2 DME ADF and MKR The pilot and copilot can simultaneously transmit in this mode the pilot transmitting over COM 1 and the copilot transmitting over COM 2 The SPLIT COM mode is cancelled by pressing the COM 1 2 button a second time While in the split com mode the copilot may make PA announcements while the pilot continues using COM 1 independently When the PA button 15 pressed after the split com mode 15 activated the copilot s mic is output over the cabin speaker when keyed A second press of the PA button returns the copilot to normal split com operation If the com radios in the installation utilize a transmit interlock system the split com function may require that this feature is enabled Refer to the radio s installation manual for guidance GARMIN makes no expressed or implied guarantees regarding the suitability of the split com feature in a given installation 3 1 6 Com Swap Function The GMA 340 allows the use of a remote mounted switch typically on the yoke to alternately transfer the active microphone back and forth between COM 1 and COM 2 The remote switch should be a momentary type connected between J2 pin 20 SWAP and J2 pin 21 SWAP return Pressing the remote switch will have no affect if COM 3 is the active transceiver or when split com 15 in use 3 1 7 Aircraft Radios amp Navigation Audio level 15 controlled by the selected nav radio volume control Pressing NAV 1 NAV 2 DME ADF 16
27. ONS INCH mm FROM BACK OF AIRCRAFT PANEL ONLY NEN 2 IF THE FRONT LIP OF THE MOUNTING RACK IS BEHIND SINE S HE SURFACE OF THE AIRCRAFT PANEL THE UNIT S 125 INCH 3 2 mm CONNECTORS MAY NOT FULLY Figure B8 GMA 340 RECOMMENDED PANEL CUTOUT DIMENSIONS GMA 340 Installation Manual Page B 7 Page B 8 blank 190 00149 01 Rev K J1 25 26 10 11 27 28 13 14 15 30 23 24 18 19 20 21 22 N 31 32 44 43 16 29 D 340 340H COM 1 SPKR LOAD COM 1 SPKR LOAD RETURN See note 3 COM 1 IN JQ COM 1 Transceiver COM 1 RETURN COM 1 MIC DC COM 1 KEY COM 2 SPKR LOAD See note 3 COM 2 SPKR LOAD RETURN COM 2 IN Jt COM 2 COM 2 RETURN Transceiver COM 2 MIC COM 2 KEY COM 3 SPKR LOAD COM 3 SPKR LOAD RETURN See note 3 COM 3 IN COM 3 Transceiver COM 3 RETURN COM 3 MIC COM 3 KEY NAV 1 IN NAV 1 RETURN NAV 1 Radio NAV 2 IN NAV 2 Radio NAV 2 RETURN DME IN DME Radio DME RETURN ADF IN ADF RETURN ADF Radio ALT WRN IN Altitude Warning Audio ALT WRN RETURN
28. R AIRCRAFT PWR BA AIRCRAFT GND AIRCRAFT GND V See note 12 14V LGT LO 28V LGT LO See note 4 14V LGT HI 28V LGT LO See note 4 14V LGT HI 28V LGT HI See note 4 HI MUSIC GAIN SELECT See note 17 NC NC COM TX MUTE See note 15 Aircraft Power Buss NOTES PERTAINING TO J1 AND J2 Cont d NOTE 13A APPLIES TO GMA 340 UNITS WITHOUT MOD 4 13A IF GENERAL AVIATION MONOPHONIC HEADSETS HAVING TRUE MONOPHONIC PLUGS ARE USED IN AN INSTALLATION HAVING STEREO HEADPHONE JACKS THE RING CONDUCTOR WILL BE SHORTED TO THE BARREL CONDUCTOR WHEN THE HEADSET IS PLUGGED IN THIS WILL NOT DAMAGE THE GMA 340 HOWEVER THIS WILL PREVENT PROPER FAILSAFE OPERATION ADDITIONALLY SINCE THE PASSENGER HEADSETS ARE CONNECTED IN PARALLEL ALL PASSENGERS WILL LOSE ONE CHANNEL IF A MONO HEADSET IS PLUGGED INTO A PASSENGER POSITION TO AVOID THIS STEREO MONO SWITCHES MAY BE INSTALLED AS SHOWN BELOW WHEN A MONO HEADSET IS USED THE SWITCH MUST BE SET TO THE OPEN POSITION Headset Return Headset R Headset L V Switch open for mono GMA 340 NOTE 13B APPLIES TO GMA 340 UNITS WITH MOD 4 13B IF UNIT MOD 4 IS INCORPORATED THE ABOVE CONDITIONS STILL REMAIN EXCEPT THAT MOD 4 ENSURES PROPER FAILSAFE OPERATION FOR BOTH STEREO AND MONO HEADSETS WITHOUT REQUIRING A STEREO MONO SWITCH 14 WHEN NO AIRCRAFT RADIO ACTIVITY IS DETECTED BY THE GMA 340 THE AMOUNT OF AMBIENT BACKGROUND NOISE FROM THE RADIOS IS FURTHER REDUCED BY THE MA
29. S THE RING CONDUCTOR WILL BE SHORTED TO THE BARREL CONDUCTOR WHEN THE HEADSET IS PLUGGED IN THIS WILL NOT DAMAGE THE GMA 340 HOWEVER THIS WILL PREVENT PROPER FAILSAFE OPERATION ADDITIONALLY SINCE THE PASSENGER HEADSETS ARE CONNECTED IN PARALLEL ALL PASSENGERS WILL LOSE ONE CHANNEL IF A MONO HEADSET IS PLUGGED INTO A PASSENGER POSITION TO AVOID THIS STEREO MONO SWITCHES MAY BE INSTALLED AS SHOWN BELOW WHEN A MONO HEADSET IS USED THE SWITCH MUST BE SET TO THE OPEN POSITION Headset Return Headset L GMA 340 NOTE 13B APPLIES TO GMA 340 UNITS WITH MOD 4 13B IF UNIT MOD 4 IS INCORPORATED THE ABOVE CONDITIONS STILL REMAIN EXCEPT THAT MOD 4 ENSURES PROPER FAILSAFE OPERATION FOR BOTH STEREO AND MONO HEADSETS WITHOUT REQUIRING A STEREO MONO SWITCH 14 WHEN NO AIRCRAFT RADIO ACTIVITY IS DETECTED BY THE GMA 340 THE AMOUNT OF AMBIENT BACKGROUND NOISE FROM THE RADIOS IS FURTHER REDUCED BY THE MASQ CIRCUIT IF THIS FUNCTION IS NOT DESIRED THEN J1 PIN 16 MASQ INH SHOULD BE TIED TO GROUND THIS NOTE DOES NOT APPLY TO THE FOLLOWING GMA 340 SERIAL NUMBERS 94900000 TO 94900499 AND 96250000 TO 96250399 15 THIS NOTE APPLIES ONLY TO UNITS CONFORMING TO MOD LEVEL 1 NORMAL MODE WHEN THIS PIN IS TIED TO GROUND TRANSMITTING KEYING ON ANY COM WILL CAUSE THE OTHER TWO COM AUDIOS TO BE MUTED DURING THE TRANSMIT SPLIT COM MODE WHEN THIS PIN IS TIED TO GROUND NEITHER COM 1 AUDIO NOR COM 2 AUDIO WILL BE MUTED DURING ANY TRANSMIT COM 3 AUDIO WILL
30. SQ CIRCUIT IF THIS FUNCTION IS NOT DESIRED THEN J1 PIN 16 MASQ INH SHOULD BE TIED TO GROUND THIS NOTE DOES NOT APPLY TO THE FOLLOWING GMA 340 SERIAL NUMBERS 94900000 TO 94900499 AND 96250000 TO 96250399 15 THIS NOTE APPLIES ONLY TO UNITS CONFORMING MOD LEVEL 1 NORMAL MODE WHEN THIS PIN IS TIED TO GROUND TRANSMITTING KEYING ON ANY COM WILL CAUSE THE OTHER TWO COM AUDIOS TO BE MUTED DURING THE TRANSMIT SPLIT COM MODE WHEN THIS PIN IS TIED TO GROUND NEITHER COM 1 AUDIO NOR COM 2 AUDIO WILL BE MUTED DURING ANY TRANSMIT COM 3 AUDIO WILL ONLY BE MUTED WHEN THE PILOT TRANSMITS 16 2 STAGE MOMENTARY SWITCH FIRST DETENT KEYED INTERCOM SECOND DETENT MICROPHONE AUDIO AND PTT ACTIVE PROVIDES KEYED INTERCOM IN HIGH NOISE ENVIRONMENTS _ FIRST DETENT ICS MIC e MICROPHONE T lt SECOND DETENT FULL ACTIVATION TX MIC KEY e MIC RETURN MICROPHONE LO 17 CONNECT TO GROUND FOR TIMES TEN 20 dB GAIN OR INSTALL SWITCH TO SELECT BETWEEN UNITY GAIN 0 dB AND TIMES TEN GAIN 20 dB FOR MUSIC1 AND MUSIC2 THIS FUNCTION APPLIES ONLY TO UNITS WITH MOD 5 INCORPORATED Figure B5 J2 INTERCONNECT WIRING DIAGRAM Page B 11 Page B 12 blank Rev J 25 26 10 11 12 27 28 13 14 15 30 23 24 O gt O1 18 19 20 21 22 N 31 32 44 43 35 33 34 42 41 40 36 37 38 39 16 29 2 COM 1 KEY
31. STALLATIONS WHERE AN 8 OHM CABIN SPEAKER IS INSTALLED THE FUNCTION ALLOWS THE SAME POWER TO BE DELIVERED TO AN 8 OHM SPEAKER AS WOULD NORMALLY BE DELIVERED TO A 4 OHM SPEAKER IF AN 8 OHM SPEAKER IS USED AND THE SPEAKER VOLUME IS ACCEPTABLE THEN THIS PIN SHOULD BE LEFT OPEN IF AN 8 OHM CABIN SPEAKER IS USED BUT MORE SPEAKER VOLUME IS DESIRED THEN J2 PIN 17 MUST BE TIED TO GROUND AND THE SPEAKER VOLUME SHOULD BE READJUSTED DO NOT GROUND J2 PIN 17 INA 4 OHM CABIN SPEAKER INSTALLATION J2 PIN 19 ENABLE CAN BE LEFT OPEN OR TIED TO GROUND IF TIED TO GROUND THEN SHORT AUDIBLE TONE WILL BE HEARD IN THE PILOT AND COPILOT HEADSETS EACH TIME A BUTTON IS PRESSED IF LEFT OPEN NO TONE IS HEARD USE COAX MEETING THE APPLICABLE AVIATION REGULATION FOR THE MARKER BEACON ANTENNA CABLE WHEN ROUTING THE MARKER BEACON ANTENNA CABLE AVOID SHARP CORNERS AND ROUTE AWAY FROM HIGH CURRENT WIRING AND ANY TRANSMITTER ANTENNA CABLES PINS 31 AND 32 OF J1 ARE UNSWITCHED UNMUTED INPUTS PINS 43 AND 44 OF J1 ARE UNSWITCHED INPUTS J2 PINS 10 AND 11 SHOULD BE CONNECTED DIRECTLY TO THE AIRFRAME USING MINIMUM WIRE LENGTH Figure Be J1 INTERCONNECT WIRING DIAGRAM Page B 13 Page B 14 blank Rev K 1 EA 31 16 2 4 3 ME 32 33 36 35 1 38 37 40 A 39 42 41 25 24 28 8 6 27 Se 44 43 13 14 20 2
32. aircraft top bottom 2 3 2 Antenna Installation Install the antenna according to the antenna manufacturer s instructions and FAA AC 43 13 2A 2 33 Antenna Cable Installation Use coax meeting the applicable aviation regulation for the marker beacon antenna cable When routing the cable avoid sharp corners and route away from high current wiring fluorescent lighting and any transmitter antenna cables Follow accepted industry practices when installing the BNC connector at the antenna end of the cable Use a BNC connector suitable for the type of cable used GMA 340 Installation Manual Page 2 1 190 00149 01 Rev K 2 3 4 Installation Approval Considerations for Pressurized Aircraft Antenna and cable installations on pressurized cabin aircraft require FAA approved installation design and engineering substantiation data whenever such installations incorporate alteration penetration of the cabin pressure vessel by connector holes and or mounting arrangements For needed engineering support pertaining to the design and approval of such pressurized aircraft antenna installations it is recommended that the installer proceed according to any of the following listed alternatives 1 2 Obtain approved antenna installation design data from the aircraft manufacturer Obtain an FAA approved Supplemental Type Certificate STC pertaining to and valid for the subject antenna installation Contact the FAA Aircraft Certification Office
33. e summarizes the ICS operation for the different modes supported by the GMA 340 MODE PILOT HEARS COPILOT HEARS PASSENGER HEARS MUSIC 1 MUTING TRIGGERED BY PILOT Selected Radios Copilot Passengers Copilot or passenger Passengers Copilot ICS activity duod ein MUSIC 1 MUSIC 1 CREW Selected Radios Pilot Selected Radios Passengers Aircraft radio activity LED LIT Copilot Copilot Pilot MUSIC 2 activity MUSIC 1 MUSIC 1 MUSIC 1 in Dual Pilot or Copilot ICS ADF activity ALL Selected Radios Selected Radios Selected Radios Aircraft radio activity LED s Pilot Pilot Pilot activity OFF Copilot Copilot Copilot ICS activity Passengers Passengers Passengers MUSIC 1 MUSIC 1 MUSIC 1 MUSIC 1 is normally muted during ICS activity However an installation option 1s available to disable ICS MUTE When ICS MUTE INHIBIT 12 pin 13 is connected to ICS MUTE INHIBIT RETURN 12 pin 14 muting of MUSIC 1 will not occur due to ICS activity The MUSIC 1 mute trip level is adjustable through an access hole in the top of the unit see figure 2 3 3 1 12 Mono Stereo Headset The use of stereo headsets 15 highly recommended If monaural headsets are plugged into stereo Jacks that do not have a switch installed the unit will not be damaged Use of a monaural headset in a stereo Jack shorts the right headset channel output to ground A person listening on a monaural headset will
34. ed by GARMIN and consequently are subject to change without notice 2 5 2 Audio Shield Termination The audio shield wires should be terminated at the rear of the unit to the screws between J1 and J2 as shown In figure 2 2 Rear View of backplate and rack _ 5 der 340 P2 rs CEs 340 P1 e 0 ii O 22 Audio shields daisy chained and terminated using a lug attached to either of these screws Figure 2 2 Audio Shield Termination GMA 340 Installation Manual Page 2 5 190 00149 01 Rev K 2 5 3 Noise Because the audio panel 1s a point in the aircraft where signals from many pieces of equipment are brought together care must be taken to minimize effects from coupled interference and ground loops Coupled interference can sneak into audio system interconnecting cables when they are routed near large AC electric fields AC voltage sources and pulse equipment strobes spark plugs magnetos EL displays CRTS etc Interference can also couple into audio system interconnecting cables by magnetic induction when they are routed near large AC current carrying conductors or switched DC equipment heaters solenoids fans autopilot servos etc Ground loops are created when there is more than one path i
35. elected audio 1s heard over the speaker 2 6 6 Music System Check NOTE Unit Mods 2 and 5 provide times ten gain for volume control of the entertainment music system Unit Mod 5 provides either switching this function between unity gain 0 dB and times ten gain 20 dB or hard wiring J2 pin 15 to ground for times ten gain When audio levels applied to Music 1 and Music 2 inputs are increased by 20 dB the amplification may also increase unwanted audio noise See note 17 in figures B5 and B7 and refer to Garmin Service Bulletins 0113 and 0210 1 Set the intercom to the ALL mode Crew 9 and Pilot 10 LED s off Connect a stereo audio source to MUSIC 1 Verify that stereo audio 1s heard over all headset positions 3 Select an audio source to COM 1 13 and verify that the sound is muted by active Com 1 audio break squelch if necessary 4 Connect a stereo music source to MUSIC 2 NA to Dual ADF Press the CREW button 9 to set the ICS to the crew mode Verify that stereo audio 15 heard in the passenger headsets only CAUTION Be sure to check all aircraft control movements before flight 15 attempted to insure that the wiring harness does not touch any moving part Verify proper operation of the marker beacon during a flight test under VFR conditions This completes the in aircraft post installation checkout Perform a flight test after installing the unit to ensure satisfactory performance of the audio and marker beacon receiver
36. ette tape or CD players The headphone outputs of these devices are used and plugged into MUSIC 1 or MUSIC 2 Two 3 5 mm stereo phone jacks should be installed in a convenient location for this purpose MUSIC 1 and MUSIC 2 have characteristics that are affected by the active intercom mode see paragraph 3 1 11 Refer to the notes in paragraphs 2 6 2 and 2 6 6 for mono stereo connections and music amplification 3 1 11 Intercom System ICS Pilot and Copilot functions are reversed on the 340H Intercom volume and squelch VOX are adjusted using the following front panel knobs note that knobs are reversed in the 340H version e LEFT SMALL KNOB Unit on off power control and Pilot ICS volume 5 Full CCW DETENT position 15 OFF e LEFT LARGE KNOB Pilot ICS mic VOX squelch level 6 CW rotation increases the amount of mic audio VOX level required to break squelch Full CCW is the hot mic position RIGHT SMALL KNOB IN position Copilot ICS volume OUT position Passenger ICS volume 7 RIGHT LARGE KNOB Copilot and passenger mic VOX squelch level 8 CW rotation increases the amount of mic audio VOX level required to break squelch Fully CCW 15 the hot mic position Each microphone input six total has a dedicated VOX circuit to ensure that only the active microphone s 15 heard when squelch is broken This represents a vast improvement over single gate systems and reduces the amount of background
37. functions Verify proper operation of the marker lamps and marker audio including the marker audio mute function Check proper operation of the sensitivity selection using the SENS button 4 by flying towards the outer marker position initially using HI sensitivity When the OM audio is just barely audible in the headset switching to LO sensitivity should reduce or eliminate the audio Page 2 8 GMA 340 Installation Manual Rev K 190 00149 01 2 7 ADJUSTMENTS The following adjustments can be made through access holes in the top cover of the GMA 340 1 Marker beacon audio level Refer to Garmin Service Bulletin 0208 if connecting to a Sandel SN3308 EHSI Marker beacon sensitivity Aircraft radio speaker output level Pilot PA microphone speaker output level pu os Copilot PA microphone speaker output level 6 MUSIC 1 mute trip level Refer to figure 2 3 for the location of the access holes CAUTION Exercise care when inserting adjustment tools through the top cover Damage to the unit may occur if an adjustment tool is accidentally forced against unintended components or circuit board paths Use a 2 mm max blade width flat blade non conductive screw driver or adjustment tool CCW adjustment increases the marker audio level CW adjustment increases the levels for the speaker outputs and MUSIC 1 mute For the marker beacon sensitivity adjustments CW increases the sensitivity The LOW sensitivity can be adjusted witho
38. heses refer to front panel controls shown in figure 3 1 page 3 1 2 6 1 Lamp Test Apply power to the unit by rotating the pilot intercom knob 5 clockwise The GMA 340 test button 17 checks the internal LED annunciators and marker beacon LED s 1 Press TEST to confirm operation of the LED s Cover the photocell 19 with a finger and observe that the LED annunciators dim automatically Check the front panel backlighting and dimming function Each annunciation is illuminated Page 2 6 340 Installation Manual Rev K 190 00149 01 2 6 2 Failsafe Operation Check 1 Turn the unit off by rotating the pilot intercom knob 5 counter clockwise 2 Check the failsafe operation by exercising the COM 1 microphone microphone key and audio over the headphones NOTE For units without Mod 4 incorporated if a monaural headset is plugged into a stereo jack the ring conductor will be shorted to the barrel conductor when the headset 15 plugged in preventing proper failsafe operation No audio will be heard In this type of installation either stereo mono switch must be installed for proper operation or Mod 4 must be incorporated If Mod 4 15 incorporated the audio will be heard only in the left channel of a stereo installation See note 13 in figures B5 and B7 and refer to Garmin Service Bulletin 0209 3 Turn the unit back on to continue testing 2 6 3 Transceiver Operational Check 1 Perform a ramp test radio check by
39. his manual If the unit is removed and reinstalled a functional check of the equipment should be conducted in accordance with section 3 of this manual Diagrams Refer to Appendix B of this manual Special Inspection Requirements N A Application of Protective Treatments N A Data Relative to Structural Fasteners Antenna installation removal and replacement should be in accordance with applicable provisions of AC43 13 1A and 43 13 2 Special Tools N A This Section is for Commuter Category Aircraft Only A Electrical loads Refer to section 1 3 of this manual B Methods of balancing flight controls N A C Identification of primary and secondary structures N A D Special repair methods applicable to the airplane Antenna installation removal and replacement should be in accordance with applicable provisions of AC43 13 1B and 43 13 2 Overhaul Period No additional overhaul time limitations Airworthiness Limitation Section N A Revision To revise this ICA a letter must be submitted to the local FSDO with a copy of the revised FAA Form 337 and revised ICA The FAA inspector accepts the change by signing Block 3 and including the following statement Page A 2 GMA 340 Installation Manual Rev K 190 00149 01 17 18 The attached revised new Instructions for Continued Airworthiness date for the above aircraft or component major alteration have been accepted by the FAA superseding the Instructions for
40. in the appropriate Region and request identification of FAA Designated Engineering Representatives DERs who are authorized to prepare and approve the required antenna installation engineering data Obtain FAA Advisory Circular AC 183C and select and contact a DER from the roster of individuals identified there under Contact an aviation industry organization such as the Aircraft Electronics Association and request their assistance 2 4 GMA 340 INSTALLATION NOTE Avoid installing the unit near heat sources If this is not possible insure that additional cooling 15 provided Allow adequate space for installation of cables and connectors The installer will supply and fabricate all of the cables All wiring must be in accordance with FAA AC 43 13 2 1 Assemble the connector rack kit according to table 2 1 and figures B4 through B7 Install the rack assembly according to the dimensions given in figures Bl and B3 Mounting brackets are not supplied due to the wide range of mounting configurations available Suitable mounting brackets may be fabricated from sheet metal or angle stock To insure a sturdy mount rear support for the unit should be provided 2 Slide the unit into the rack until the jack screw makes contact with the receptacle located in the back plate 3 Insert a 3 32 Allen wrench into the jackscrew access hole on the faceplate 4 Turn the Allen wrench clockwise until the unit 1s secured in the rack Continue turning unti
41. l tight but do not over tighten 5 To remove the unit from the rack turn the Allen wrench counterclockwise until it disengages from the rack Page 2 2 GMA 340 Installation Manual Rev K 190 00149 01 2 5 REAR CONNECTIONS 2 5 1 Location The GMA 340 has two 44 pin connectors located at the rear of the unit designated and J2 and J2 pin assignments are given in table 2 1 When viewed from the back of the rack J1 and J2 look like the following 120 o o o o o o o o o o o o o 01 196 o o o o o o o o o o o o o 01 ge 2 0 000000000000 0000000 0 30 16 0000000002090 00000000000000 44 31 44 31 Figure 2 1 Rear Connectors NOTES These notes apply to the following table Denotes Active Low Ground to activate Refer to Figures B4 through B7 for GMA 340 interconnect wiring diagrams The GMA 340 provides inputs for an unswitched aircraft radio TEL RINGER and an un muted unswitched aircraft radio ALT WRN GMA 340 Installation Manual Page 2 3 190 00149 01 Rev K Connector J1 Connector J2 oo 1 ON Mkr Ant Mkr Ant Return Com 3 In Com 3 Return Com 3 Mic Com 3 Key ADF In ADF 2 In ADF Return ADF 2 Return Com 1 In Com 1 Return Com 1 Mic Com 1 Key Com 2 In Com 2 Return Com 2 Mic MASQ Inh Nav In Nav 1 Return Nav 2 In Nav 2 Return DME In ADF 1 In DME Return ADF 1 Return Com 3 Spkr Load Com 3 Spkr Load Return C
42. n which return currents can flow or when signal returns share the same path as large currents from other equipment These large currents create differences in ground potential between the various equipment operating in the aircraft These differences in potential can produce an additive effect at an audio panel signal input The audio panel may see the desired input signal plus an unwanted component injected by ground differentials a common cause of alternator related noise This is the main reason why all audio jacks should be isolated from ground Terminating audio shields just at one end eliminates another potential ground loop injection point Single point grounding cannot be overstressed for the various avionics producing and processing audio signals Single point in this context means that the various pieces of equipment share a single common ground connection back to the airframe Good aircraft electrical charging system ground bonding 15 also important The wiring diagrams and accompanying notes in this manual should be followed closely to minimize noise effects 2 6 POST INSTALLATION CHECKOUT CAUTION Check wiring connections for errors before inserting the GMA 340 into the tray Incorrect wiring could cause internal component damage Except for marker beacon operation an in aircraft checkout may be performed in the aircraft on the ramp with known good microphone headset speaker and avionics receivers Item numbers in parent
43. noise in the headphones during cockpit communications After the operator has stopped talking the intercom channel remains momentarily open to avoid closure between words or normal pauses The GMA 340 provides three intercom modes PILOT CREW and ALL The mode selection 1s accomplished using the PILOT 10 and CREW 9 buttons Pressing a button activates the corresponding ICS mode Pressing again deactivates the mode The operator can switch directly from PILOT to CREW or from CREW to PILOT by pressing the other mode button ALL mode is active when neither PILOT or CREW mode is selected These modes allow different degrees of interaction between the crew and passengers Page 3 4 GMA 340 Installation Manual Rev K 190 00149 01 PILOT mode isolates the pilot from everyone else and dedicates the aircraft radios to the pilot exclusively The copilot and passengers share communication between themselves but cannot communicate with the pilot or hear the aircraft radios CREW mode places the pilot and copilot on a common ICS communication channel The passengers are on their own intercom channel and can communicate with each other but cannot communicate with the crew or hear the aircraft radios ALL mode allows full intercom communication between everyone plugged in to the GMA 340 Aircraft radios are heard by all MUSIC 1 and MUSIC 2 stereo entertainment inputs are affected by the intercom mode selected The following tabl
44. om 1 Spkr Load Com 1 Spkr Load Return Com 2 Spkr Load Com 2 Spkr Load Return Alt Wrn Return Pilot Mic In Pilot Mic Key Pilot Mic Return Ext White Lamp A Ext Blue Lamp O Ext Amber Lamp M Middle Mkr Sens Pass Headset L Pass Headset R Pass Headset Return Tel Ringer Return Tel Ringer In Pilot Headset Return Co Pilot Headset Return Co Pilot Headset L Co Pilot Headset R 14V Lgt Lo 28V Lgt Lo 14 Lgt 28V Let Lo 14V Lgt 28V Let Aircraft Power Aircraft Power Aircraft Ground Aircraft Ground PA Mute ICS Mute Inhibit ICS Mute Inhibit Return High Music Gain Select Pilot Headset L 8 Ohm Select Reserved Tone Enable Swap Swap Return NC Music 1 L In Music 1 R In Music 1 Return Music 2 L In NC Music 2 R In DME In Music 2 Return DME Return NC Com TX Mute Pilot Headset R Co Pilot Mic In Co Pilot Mic Key Co Pilot Mic Return Pass 1 Mic Pass 1 Mic Return Pass 2 Mic Pass 2 Mic Return Pass 3 Mic Pass 3 Mic Return Pass 4 Mic Pass 4 Mic Return Spkr Return Spkr Out Table 2 1 J1 and J2 Pin Assignments Dual ADF in Parentheses Page 2 4 Rev K GMA 340 Installation Manual 190 00149 01 Wire Gauge 22 28 AWG Extraction Tool Military P N M22520 2 01 M22520 2 09 M81969 1 04 Positronic 9507 9502 3 M81969 1 04 ITT Cannon 995 0001 73 AM 601966 6 Daniels K42 Astro 615725 Table 2 2 Recommended Crimp Tools NOTE Non GARMIN part numbers shown are not maintain
45. ound in the GMA 340 Maintenance Manual P N 190 00149 02 After installation of the GMA 340 FAA Form 337 must be completed by an appropriately certificated agency to return the aircraft to service 12 GENERAL DESCRIPTION The GARMIN GMA 340 Audio Panel meets the needs of aircraft owners and operators who require reliability and versatility in the essential audio switching function LED illuminated push button simplicity and intuitive panel layout allow audio selection of both NAV and COM audio Large single button activation of the COM microphone and audio for up to three COM transceivers simplifies cockpit workload Photocell dimming circuitry automatically adjusts the brightness of the LED s to a level appropriate for ambient cockpit light A fail safe circuit connects the pilot s headset and microphone directly to COMI in the event that power is interrupted or the unit is turned off Additionally the GMA 340 includes a six position intercom ICS with electronic cabin noise de emphasis two stereo music inputs and independent pilot copilot and passenger volume controls To further simplify the cockpit workload the intercom provides three selectable modes of isolation One hundred percent solid state circuitry and extensive use of surface mount technology are employed A pilot selectable cabin speaker output can be used to listen to the selected aircraft radios or to broadcast PA announcements The PA function 15 pilot selectable The GMA 3
46. r 011 00401 GMA 340 Unit Assembly 011 00401 10 replaces 011 00401 00 011 00652 00 Connector GMA 340 011 00678 00 Rack Backplate GMA 340 115 00262 00 SMP Install Rack GMA 340 The installation kit 15 the same for the GMA 340 GMA 340H and GMA 340 Dual ADF 1 5 INSTALLATION ACCESSORIES Marker beacon antenna kit P N 010 10175 00 Note A marker beacon antenna approved to TSO 35 that has been installed to meet the requirements of this manual may be approved for use with the GMA 340 GMA 340 Installation Manual Page 1 3 190 00149 01 Rev K 16 ADDITIONAL EQUIPMENT REQUIRED e Antenna sealant use manufacturer s instructions install according to FAA AC 43 13 2A e Cables The installer will fabricate and supply all system cables Interconnect wiring diagrams are detailed in Appendix B e Hardware 6 32 100 flat head screw 6 and 446 32 self locking nut 6 ea Hardware required to mount the installation rack is not provided e Stereo headphone jacks up to 6 microphone jacks up to 6 3 5mm stereo jacks up to 2 and insulating washers for all 1 7 LIMITED WARRANTY GARMIN warrants this product to be free from defects in materials and manufacture for one year from the date of purchase 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 The customer 1s ho
47. rature 4 5 1 High Temperature 4 5 2 4 5 3 In flight Loss of Cooling 4 5 4 Cooling air not required Altitude 4 6 1 Decompression 4 6 2 Overpressure 4 6 3 Temperature variation 5 0 Equipment tested to Category C Humidity 6 0 Equipment tested to Category A Shock 7 0 Equipment tested per DO 160C Par 7 2 1 Operational Equipment tested per DO 160C Par 7 2 1 Crash Safety T3 Equipment tested per DO 160C Par 7 2 1 Vibration 8 0 Equipment tested without shock mounts to Categortes B M and N Explosion 9 0 Equipment identified as Category X no test required Waterproofness 10 0 Equipment identified as Category X no test required Fluids Susceptibility 11 0 Equipment identified as Category X no test required sand and Dust 12 0 Equipment identified as Category X no test required Fungus 13 0 Equipment identified as Category X no test required salt Spray 14 0 Equipment identified as Category X no test required Magnetic Effect 15 0 Equipment tested 1s class Z Power Input 16 0 Equipment tested to Category B Voltage Spike 17 0 Equipment tested to Category A Audio Frequency Susceptibility 18 0 Equipment tested to Category B Induced Signal Susceptibility 19 0 Equipment tested to Category A Radio Frequency Susceptibility 20 0 Equipment tested to Category T Radio Frequency Emission 21 0 Equipment tested to Category B Lightning Induced Transient 22 0 Equipment identified as Category XXXX no test susceptibility required Ligh
48. ssengers VOX level controls 2 pilot copilot passengers VOX circuits 6 one per mic input Music inputs stereo 2 1 in Dual ADF version one input mutable Music input impedance 460 ohms minimum Music input level Less than 500 mVac RMS for full output typical Vac RMS MAX 3 Vac p p Microphone signal processing 9 pole characteristic and special cabin noise band de emphasis Intercom isolation modes 3 Special functions Configurable aural push button annunciation for the crew Headphone Outputs Output amplifiers 3 stereo pilot copilot passengers Fidelity Power into 1500 Distortion 50 mW 0 597 100 mW lt 5 Frequency response music 100 Hz to 15 kHz nominal Aircraft radio 100 Hz to 6 kHz nominal ICS mic Special cabin noise band de emphasis Speaker Outputs Outputs selectable 1 pilot selectable Output power 10 Watts into 4 or 80 any normal supply voltage Frequency response 350 Hz to 6 kHz nominal special functions PA Mode pilot selectable including split operation Marker Beacon Receiver Frequency Crystal controlled at 75 MHz Sensitivity LO 1000 uV hard HI 200 uV hard Selectivity 6 dB 2 10 kHz min 40 dB 200 kHz max Input impedance 500 External lamp drive 125 mA max each output Other outputs Middle MKR sense Special functions SmartMute marker audio muting 14 EQUIPMENT GMA 340 Audio Panel Ship Level Assembly P N 010 00152 includes the following depending on part numbe
49. ted May 13 1998 ar later FAA approved revision Sanitation anar Compatibility of this design change with previously approved modifications must be determined by the installer if the holder agrees to permit another person to use this certificate to alter the product the holder shall give the other person written evidence of that permission oof February 23 1998 PR Peale of isine gt October 02 1998 e By of he Llosa raton lue Schott Signature C Dale Bleakney GARMIN Program Manager Wichita Aircrafi Certification Office Title Any alteration of this certificate punishable by a Fine of not excesding 1 000 or imprisonmenk mot exceeding 3 years or both Form 110 2 10 66 PAGE 1 of 2 PAGES This certificate may be transferred fa accordance wilh FAR 21 47 Page C 2 GMA 340 Installation Manual Rev K 190 00149 01
50. tning Direct Effects Test 23 0 Equipment identified as Category X no test required Icing 24 0 Equipment identified as Category X no test required Other Tests Remarks Using 2V m Page 4 GMA 340 Installation Manual Rev K 190 00149 01 APPENDIX B INSTALLATION DRAWINGS B 1 GENERAL This section contains the following installation drawings e BI GMA 340 Outline Drawing B2 Connector Rack Kit Drawing B3 340 Recommended Panel Cutout Dimensions e Interconnect Wiring Diagram e 2 Interconnect Wiring Diagram Interconnect Wiring Diagram 2 Interconnect Wiring Diagram GMA 340 Installation Manual Page B 1 190 00149 01 Rev K This page intentionally left blank Page B 2 GMA 340 Installation Manual Rev K 190 00149 01 10 67100 061 enuey 07 Q pee py O 9 oO 25 lt o di 2 2 L _ O rO SE qm E mp pup 78 ETE oc No Z o m 2 s Nao O m gt i Ec il Ji xd l hum amp lt 27 CS x 0 0 fy 011
51. ty Applies to aircraft altered by installation of the GARMIN GMA 340 Audio Panel Definitions Abbreviations None N A Precautions None N A Units of Measurement None N A Referenced Publications GARMIN GMA 340 Audio Panel Installation Manual P N 190 00149 01 GARMIN GMA 340 Audio Panel Maintenance Manual P N 190 00149 02 GARMIN GMA 340 Audio Panel Pilot s Guide P N 190 00149 00 GARMIN GMA 340 STC SA00710WI Distribution This document should be a permanent aircraft record 2 Description of the Alteration Installation of the GARMIN GMA 340 Audio Panel with interface to external transceivers and include other equipment systems as appropriate Refer to section 2 and interconnect wiring diagrams figures B3 through B6 of this manual for interconnect information Antenna installation removal and replacement should be in accordance with applicable provisions of AC43 13 1B and 43 13 2 3 Control Operation Information Refer to the GMA 340 Audio Panel Pilot s Guide GMA 340 Installation Manual Page 1 190 00149 01 Rev K 10 11 12 13 14 15 16 Servicing Information N A Maintenance Instructions Maintenance of the GMA 340 Audio Panel is on condition only Periodic maintenance is not required Refer to the GMA 340 Audio Panel Maintenance Manual Troubleshooting Information Refer to the GMA 340 Audio Panel Maintenance Manual Removal and Replacement Information Refer to section 2 4 of t
52. ut affecting the HIGH sensitivity setting However adjusting the HIGH sensitivity setting will affect the LOW sensitivity setting also If the HIGH sensitivity setting 15 adjusted then the LOW sensitivity setting should be checked and adjusted afterwards if needed If your GMA 340 top cover does not have the marker beacon sensitivity adjustment access holes as indicated in figure 2 3 and you need to adjust the sensitivity contact Garmin for instructions GMA 340 Installation Manual Page 2 9 190 00149 01 Rev K O _ MKRLO Sense MKR HI Sense O O V N C radio SPKR level Pilot PA MIC SPKR level Copilot PA MIC SPKR level Marker audio level Ow Music1 mute trip level Figure 2 3 Access Hole Location Top View Page 2 10 Rev K GMA 340 Installation Manual 190 00149 01 SECTION 3 OPERATION 3 1 OPERATION GARMIN mem GMA 340 M COM2 COM3 NAV1 2 DME TEST so us e mmm PILOT 9 89 LO COM1 2 COM3 COM voL MIC MIC MIC jo CABINAUDIO ICSISOLATION vo SENS PILOT 5 14 15 12 1 10 9 7 8 Figure 3 1 GMA 340 Front Panel 3 1 1 Front Panel Controls Marker Beacon Lights Marker Beacon Receiver Audio Select Mute Button l 2 3 Marker Beacon Receiver Sensitivity Indicator LED s 4 Marker Beacon Receiver Sensitivity Selection Button Unit On Off
53. wever responsible for any transportation costs This warranty does not cover failures due to abuse misuse accident or unauthorized alteration or repairs THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR 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 SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THIS 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 To obtain warranty service contact your local GARMIN Authorized Service Center For assistance In locating a Service Center near you call GARMIN Customer Service at one of the numbers shown below GARMIN International Inc GARMIN Europe Ltd 1200 East 151 Street Unit 4 The Quadrangle Abbey Park Industrial Estate Olathe Kansas 66062 U S A Romsey 5051 9AQ U K Phone 913 397 8200 Phone 44 1794 519944 FAX 913 397 0836 FAX 44 1794 519222 Page 1 4 GMA 340 Installation Manual Rev K 190 00149 01 SECTION 2 INSTALLATION 2 1 INTRODUCTION This section provides the necessary information for the installation and
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