(2) Do the fault isolation.
4. Fault Isolation
_______________
A. Procedure.
(1) Open the L L/G Door for access to the proximity sensor (Ref. AMM TASK 32-12-00-010-001)
NOTE : If the MLG uplock (2509GM) is incorrectly greased, it can
____ cause incorrect operation (Ref. TFU 323144001).
(2) Do a visual inspection of the MLG uplock (2509GM) and look for signs of overgreasing (Ref. AMM TASK 12-22-32-640-001).
(3) Refer to (Ref. AMM TASK 32-12-00-010-001) Figure 401/TASK 32-31-73-991-001, and find the applicable proximity sensor 09GA and/or 11GA.
(4) Release the electrical connector for the BITE shown failed proximity sensor.
NOTE : If the ELDEC proximity sensor test unit is available. Go to
____ page block 301 and do the procedure in table 5.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞32-31-00∞∞∞∞∞∞∞∞∞∞Page 262
May 01/05R
CES
(5) Use a Multimeter and do a check of the resistance between the pins A and B of the PROX SNSR, (Ref. ASM 323103S01004) (Ref. ASM 323204S01) the resistance must be approximately 13ohms.
(6) On the PROX SNSR do a check of the circuit isolation.
(a) Connect the pins A and B together.
(b) Connect one test lead of the 50Vdc Isolation Tester to the pins AB and the other test lead to the case.
(c) Supply a test signal for 5 seconds and read the resistance value shown.
(d) The resistance value must be more than 400Megohms.
(7) If the proximity sensor 09GA or 11GA fails one of the two tests at Para.4.A.(5) or (6) replace the unserviceable proximity sensor (Ref. AMM TASK 32-31-73-000-001) (Ref. AMM TASK 32-31-73-400-001).
(8) If the tests at Para.4.A.(5) and (6) are satisfactory then do a check of the aircraft wiring between the applicable proximity sensor electrical connector and the LGCIU- 1 (2) ARINC tray (Ref. ASM 323103S01) (Ref. ASM 323104S01)
(9) If there is a circuit/interface fault do the repair.
(10) Do the L/G BITE test as in Para.3.A.(1).
(11) If no fault is found at Para.4.A.(8), replace the LGCIU-1 (5GA1) LGCIU-2 (5GA2) (Ref. AMM TASK 32-31-71-000-001) (Ref. AMM TASK 32-31-71-400-001).
(12) Do the GROUND SCANNING and make sure that the ground log is clear.
5. Close-up
________
A. Put the aircraft back to its initial configuration.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞32-31-00∞∞∞∞∞∞∞∞∞∞Page 263
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CES TASK 32-31-00-810-827
NLG Uplock Proximity Sensor Fault (12GA, 13GA)
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
GEAR.
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______
START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
1. Possible Causes
_______________
- LGCIU-1 (5GA1)
- LGCIU-2 (5GA2)
- 12GA
- 13GA
- aircraft wiring
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific Multimeter
No specific 50Vdc Isolation Tester
B. Referenced Information 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 1(27)
