11GA(10GA), 27GA(26GA), 29GA(28GA), 15GA(14GA), 17GA(16GA), 21GA(20GA), 23GA(22GA), 33GA(32GA), 35GA(34GA)
AMM 32-31-73-200-001 Inspection of the MLG Proximity Sensor and Target Clearances
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 32-31-73-820-008 Inductance Check of the Proximity Sensors/Switches
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REFERENCE DESIGNATION -------------------------------------------------------------------------------
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
3. Fault Confirmation__________________
A. Message Analysis
(1) Do a BITE test on the LGCIU 1 or LGCIU 2 (Ref. AMM TASK 32-69-00-740-001), which identified the L L/G proximity-sensor fault:
- if the fault message L L/G DNLK PROX SNSR 15GA (17GA) is shown, do the fault isolation procedure in Para. 4.A.(2).
(2) If the fault message L L/G DNLK PROX SNSR 15GA (17GA) TGT POS is shown on the Post Flight Report (PFR), do the fault isolation procedure in Para. 4.A.(1).
NOTE : The fault L L/G DNLK PROX SNSR 15GA (17GA) TGT POS can not 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 PRF shows a proximity-sensor target-position fault, do the steps that follow:
(a) Do the inspection of the applicable proximity-sensor PROX SNSR-L L/G DNLK, SYS 1 (15GA) or PROX SNSR-L L/G DNLK, SYS 2 (17GA), (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.
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CES
(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 PROX SNSR, (Ref. ASM 32-31/03) or (Ref. ASM 32-31/04). The resistance must be approximately 13 ohms.
(c) Connect the pins A and 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 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-L L/G DNLK, SYS 1 (15GA) or PROX SNSR-L L/G DNLK, SYS 2 (17GA), (Ref. AMM TASK 32-31-73-000-001) and (Ref. AMM TASK 32-31-73-400-001).
(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).
5. Close-up
________
A. Put the aircraft back to its initial configuration.
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本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 1(23)
