(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 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.
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(d) The resistance value must be more than 400Megohms.
(6) If the proximity sensor 30GA or 31GA 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 323103S01) (Ref. ASM 323104S01)
(8) If there is a circuit/interface fault do the repair.
(9) Do the L/G BITE test as in Para.3.A.
(10) If no fault is found at Para.4.G, 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
________
A. Put the aircraft back to its initial configuration.
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TASK 32-31-00-810-822
RLG Downlock Proximity Sensor Fault (14GA, 16GA)
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-R L/G DNLK, SYS 1 (14GA)
- PROX SNSR-R L/G DNLK, SYS 2 (16GA)
- 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 -------------------------------------------------------------------------------
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 32-31-73-200-001 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 R L/G proximity-sensor fault:
- if the fault message R L/G DNLK PROX SNSR 14GA (16GA) is shown, do the fault isolation procedure in Para. 4.A.(2). 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(21)
