TASK 32-31-00-810-824
NLG Downlock Proximity Sensor Fault (18GA, 19GA)
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-NLG DNLK, SYS 1 (18GA)
- PROX SNSR-NLG DNLK, SYS 2 (19GA)
- 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 50 VDC 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 32-31-73-000-005 Removal of the NLG Proximity-Sensors 12GA, 13GA,
18GA, 19GA, 24GA, 25GA, 30GA, 31GA, 37GA (36GA), 39GA (38GA) AMM 32-31-73-200-002 Inspection of the NLG Proximity Sensor and Target Clearances
AMM 32-31-73-400-005 Installation of the NLG Proximity-Sensors 12GA, 13GA, 18GA, 19GA, 24GA, 25GA, 30GA, 31GA, 37GA (36GA), 39GA (38GA)
AMM 32-31-73-820-008 Inductance Check of the Proximity Sensors/Switches
「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 255
May 01/05R CES
-------------------------------------------------------------------------------
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. Test
(1) Do a BITE test of the applicable LGCIU 1 or LGCIU 2, which identified the NLG proximity-sensor fault (Ref. AMM TASK 32-69-00-740-001).
- if the failure message N L/G DNLK PROX SNSR 18GA (19GA) is shown, do the fault isolation procedure in Para. 4.A.(2).
(2) If the fault message N L/G DNLK PROX SNSR 18GA (19GA) TGT POS is shown on the Post Flight Report (PFR), do the fault isolation procedure in Para 4.A.(1).
NOTE : The fault N L/G DNLK PROX SNSR 18GA (19GA) 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 follow:
(a) Do the inspection of the applicable proximity-sensor PROX SNSR-NLG DNLK, SYS 1 (18GA) or PROX SNSR-NLG DNLK, SYS 2 (19GA), (Ref. AMM TASK 32-31-73-200-002):
(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 256
May 01/05R
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 applicable proximity sensor (Ref. ASM 32-31/03) or (Ref. ASM 32-31/04):
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本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 1(24)
