SB-GA8-2005-24 - Mahindra Aerospace
Contents
1. on O 4 PLACES a o HEE _ o 45 E Z S o 4 O 400 Pt O ae Ea UP A O O D Da 91 450 O m S000 am Figure 1 Figure 2 1 8 Install new alternator stay GA8 242028 21 item 4 to engine using same hardware as used for the previous stay SB GA8 2005 24 Date of Issue 18 November 2005 Page 3 of 5 1 9 Remove the existing alternator pulley from the alternator Install new alternator fan pulley item 3 and secure using the same hardware as used to secure the previous pulley Torque the nut to 800 1000 in Ibs 90 113 Nm Ensure that the slots on the nut align with the holes in the shaft and secure the nut using a new split pin item 5 NOTE The nut should be tightened initially to the lower value Torque can then be increased up to the maximum limit in order to install the split pin A thick or thin washer may be added under the nut as required in order to remain within torque tolerances 1 10 Remove existing fibreglass shroud from alternator and install new fibreglass shroud GA8 242027 11 item 6 1 11 Install modified alternator back onto the engine using the same hardware as used for the previous alternator 1 12 Tension the alternator belt in accordance with Lycoming Service Instruction No 1129B as per Section 24 00 55 of the GA8 Service Manual Lockwire the bolt securing the alternator stay to the alternator body in accordance with FAA publication AC 43 13 1B ref2. Fax 61 03 5172 1201
3. e dl Gippsland SB GA8 2005 24 Aeronautics Issue 1 MANDATORY PO Box 881 Morwell Victoria 3840 Australia Ph 61 0 3 5172 1200 Fax 61 0 3 5172 1201 www gippsaero com Service Bulletin Subject Alternator Cooling System Upgrade Applicability All GA8 serial numbers up to S N GA8 05 076 except serial numbers GA8 03 030 GA8 04 058 GA8 04 066 and GA8 05 074 Amendments Nil Initial issue Background Some operators of aircraft that utilise a high proportion of electrical equipment have reported high alternator temperatures during start up and ground operations This service bulletin introduces a combined alternator pulley fan and ducting to improve alternator cooling Compliance Mandatory to be complied with at the next periodic inspection after 31 January 2006 Weight and Balance Negligible effect on weight and balance Approval The technical aspects of this Service Bulletin have been approved under a CASA Authorisation SB GA8 2005 24 Date of Issue 18 November 2005 Page 1 of 5 Parts tem PartNumber vesoripton oy Scat 6 Air Duct 18 i Parts Availability Parts can be obtained directly from Gippsland Aeronautics Tel 61 03 5172 1200 Fax 61 03 5172 1201 Email spares gippsaero com Labour 2 hours should be allocated for completing the work detailed in this service bulletin Warranty Gippsland Aeronautics factory participation is limited to new aircraft in warra
4. er to Figure 3 Figure 3 SB GA8 2005 24 Date of Issue 18 November 2005 Page 4 of 5 1 13 Connect air duct GA8 212024 21 item 8 from the intake plenum to the alternator shroud and secure using hose clamps item 7 at each end Secure the air duct to the induction trunk using cable ties item 9 Refer to figure 4 Figure 4 1 14 Reconnect the alternator to the electrical system 1 15 Reset the 100A main and 10A field alternator circuit breakers 1 16 Conduct functional check of the electrical system to ensure that the alternator is operating correctly In particular ensure that there is a good earth grounding between the alternator stay and the alternator body the alternator stay and the engine and the alternator body and the engine 1 17 Refit cowls Documentation Update aircraft log book to reflect incorporation of this Service Bulletin Compliance Notice Complete the Document Compliance Notice and return to Gippsland Aeronautics by fax or mail SB GA8 2005 24 Date of Issue 18 November 2005 Page 5 of 5 DOCUMENT COMPLIANCE NOTICE es Gi ppsland Document Service Bulletin SB GA8 2005 24 SA A Aeronautics Aircraft Serial Number GA8 service Bulletin SB GA8 2005 24 Issue 01 has been incorporated in the above aircraft Date Signed Print Name Please post or fax this compliance notice to Gippsland Aeronautics Attn Technical Services P O Box 881 Morwell Victoria 3840 Australia
5. nty at the time of compliance For details relating to claims contact Gippsland Aeronautics Instructions 1 Installation 1 1 If installed disarm the alternator excitation capacitor in accordance with section 24 00 30 of the GA8 Service Manual 1 2 Ensure that the master switches are OFF except that bus 2 master switch must be on if required by section 24 00 30 of the GA8 Service Manual Isolate the alternator from the electrical system by pulling the 100A main and 10A field alternator circuit breakers in the floor circuit breaker panel in front of the pilots seat Ta Remove upper and lower cowls to gain access to the alternator and intake plenum SB GA8 2005 24 Date of Issue 18 November 2005 Page 2 of 5 1 4 Disconnect the alternator from the electrical system and remove from the engine with cooling duct 1 5 Block or remove the cooling blast tube from the front engine baffle If the tube is removed the gap in the cowl must be blocked by a new piece of baffle rubber If the tube is blocked consideration must be given to water being trapped in the tube 1 6 Modify the oil cooler RH side baffle to add 1 45 diameter hole and rivet pattern as per figure 1 1 7 Apply a suitable quantity of neutral cure silicon sealant to the faying surface of the filter mesh GA8 716021 101 item 2 and install spigot GA8 713022 59 item 1 and filter mesh to baffle using TLED 435 rivets item 10 Refer to figure 2 02 586 o 90 125
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