(5) 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 45Vdc Isolation Tester to the pins AB and the other test lead to the case.
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(c) Supply a test signal for 5 seconds and read the resistance value shown.
(d) The resistance value must be more than 100Megohms.
(6) If the 36GA or 37GA or 38GA or 39GA fails one of the two (2) test at Para. 4.A. (4) or (5), replace the unserviceable proximity sensor (Ref. AMM TASK 32-31-73-000-005) (Ref. AMM TASK 32-31-73-400-005).
(7) If the tests at Para.4.A.(4) and (5) 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 32-31/03) (Ref. ASM 32-31/04).
(8) If there is a circuit/interface fault do the repair.
(9) Do the L/G BITE test as in Para. 3.A.(1).
(10) If no fault is found at Para. 4.A.(7), replace the LGCIU-1 (5GA1) LGCIU-2 (5GA2) (Ref. AMM TASK 32-31-71-000-001) (Ref. AMM TASK 32-31-71-400-001).
(11) Do the GROUND SCANNING and make sure that the ground log is clear.
5. Close-up
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A. Put the aircraft back to its initial configuration.
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TASK 32-31-00-810-819
RLG Door Closed Proximity Sensor Fault (26GA, 28GA)
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
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GEAR.
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
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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
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- LGCIU-1 (5GA1)
- LGCIU-2 (5GA2)
- PROX SNSR-R L/G DOOR CLOSED, SYS 1 (26GA)
- PROX SNSR-R L/G DOOR CLOSED, SYS 2 (28GA)
- aircraft wiring/connectors
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
AMM 32-31-73-000-001 Removal of the Proximity-Sensors 9GA(8GA),
11GA(10GA), 27GA(26GA), 29GA(28GA), 15GA(14GA), 17GA(16GA), 21GA(20GA), 23GA(22GA), 33GA(32GA), 35GA(34GA)
AMM 32-31-73-400-001 Installation of the Proximity-Sensors 9GA(8GA), 11GA(10GA), 27GA(26GA), 29GA(28GA), 15GA(14GA), 17GA(16GA), 21GA(20GA), 23GA(22GA), 33GA(32GA)...
AMM 32-69-00-740-001 BITE Check Landing Gear Control Interface Unit (LGCIU) using MCDU to Ensure that Continuous BITE is Operative
ASM 32-31/03
ASM 32-31/04
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3. Fault Confirmation
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A. Test
(1) Do a BITE test with the LGCIU that gave the door closed proximity sensor message (Ref. AMM TASK 32-69-00-740-001):
- if the maintenance message R L/G DOOR CLOSED PROX SNSR 26GA (or 28GA) is shown, do the fault isolation procedure in Para. 4.A.
- if a maintenance message is shown, which is not related to R proximity sensors 26GA or 28GA, do the trouble shooting procedure R related to the maintenance message.
- if a maintenance message is not shown, no more maintenance work is necessary.
4. Fault Isolation
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A. Procedure
(1) Interchange LGCIU1 with LGCIU2 (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
(2) Do the test in Para. 3. A. with the LGCIU 1 and LGCIU 2:
- if the fault stays in the same system as in the initial test, do step (4)
- if the fault moves to the opposite system, do the next step. 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(18)
