(2) If the fault message R L/G DNLK PROX SNSR 14GA (16GA) TGT POS is shown on the Post Flight Report (PFR), do the fault isolation procedure in Para. 4.A.(1).
NOTE : The fault R L/G DNLK PROX SNSR 14GA (16GA) TGT POS cannot be
____ identified by the BITE test. The BITE test can only confirm an open-circuit or short-circuit in the proximity-sensor, or its related wiring. Target position faults can only be confirmed by continuous BITE during L/G operation. To confirm a target position fault, it is necessary to do the proximity-sensor/target inspection and the inductance check, given in the fault isolation procedure.
4. Fault Isolation_______________
A. Procedure.
(1) If the PFR shows a proximity-sensor target-position fault, do the steps that follow:
(a) Do the inspection of the applicable proximity-sensor PROX SNSR-R L/G DNLK, SYS 1 (14GA) or PROX SNSR-R L/G DNLK, SYS 2 (16GA), (Ref. AMM TASK 32-31-73-200-001):
(b) Use an inductance meter to do a check of the inductance of the applicable proximity-sensor (Ref. AMM TASK 32-31-73-820-008).
- if the fault continues, do the next step.
「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 250
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(2) If the BITE test shows a proximity-sensor fault, do the steps that follow:
(a) At the applicable proximity sensor, release the electrical connector.
NOTE : If the ELDEC proximity-sensor test unit is available, go
____ to page block 301 and do the procedure in Para. 6.
(b) Use a Multimeter and do a check of the resistance between the pins A and B of the applicable proximity-sensor, (Ref. ASM 32-31/03) or (Ref. ASM 32-31/04). The resistance must be approximately 13 ohms.
(c) Connect the pins A and B together.
(d) Connect one test lead of the 50Vdc Isolation Tester to the pins AB and the other test lead to the case.
(e) Supply a test signal for 5 seconds and read the resistance value shown. The resistance value must be more than 400 Megohms.
(f) From the resistance checks in steps (b) and (e):
- if the two resistance values are correct, do step (4)
- if one or more of the resistance values is not correct, do the next step.
(3) Replace the applicable proximity-sensor PROX SNSR-R L/G DNLK, SYS 1 (14GA) or PROX SNSR-R L/G DNLK, SYS 2 (16GA), (Ref. AMM TASK 32-31-73-000-001) and (Ref. AMM TASK 32-31-73-400-001):
- if the fault continues, do the next step.
(4) Do a check and repair as necessary the aircraft wiring between the applicable proximity-sensor electrical connector and the related LGCIU ARINC tray (Ref. ASM 32-31/03) or (Ref. ASM 32-31/04).
(5) Do the test in Para. 3.A.(1).
- if the fault continues, do the next step.
(6) Replace the applicable LGCIU-1 (5GA1) or LGCIU-2 (5GA2), (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001), which identified the fault.
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 251
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TASK 32-31-00-810-823
LLG Downlock Proximity Sensor Fault (15GA, 17GA)
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
_______________
- PROX SNSR-L L/G DNLK, SYS 1 (15GA)
- PROX SNSR-L L/G DNLK, SYS 2 (17GA)
- LGCIU-1 (5GA1)
- LGCIU-2 (5GA2)
- aircraft wiring
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific inductance meter
No specific Multimeter
No specific 50Vdc Isolation Tester
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 1(22)
