Cargo Door (Aft) Handle Proximity Sensor Fault (34WV)

TASK 32-31-00-810-831-A
Cargo Door (Aft) Handle Proximity Sensor Fault (34WV)

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. MOVEMENT OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

1. Possible Causes

LGCIU-1 [5GA1]
PROX SW-HANDLE, AFT CARGO COMPT DOOR [34WV]
wiring

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	MULTIMETER - STANDARD
No specific	AR	TESTER - INSULATION RESISTANCE
38-368-02	1	UNIT-TEST,SENSOR
38-368-03	1	UNIT-TEST,SENSOR

B. Referenced Information

REFERENCE	DESIGNATION
ASM 315405
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU
AMM 32-69-00-740-001	BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative
AMM 52-71-12-000-001	Removal of the Proximity Switches
AMM 52-71-12-400-001	Installation of the Proximity Switches
TSM TASK 32-31-00-03	NORMAL EXTENSION AND RETRACTION - TASK SUPPORTING DATA

3. Fault Confirmation
Subtask 32-31-00-740-072-A

A. Test
(1) Do a BITE test of the LGCIU-1 AMM 32-69-00-740-001.
(2) If the failure message AFT CARGO DOOR HANDLE PROX SNSR 34WV is shown, do the fault isolation procedure in Para. 4.A.

4. Fault Isolation
Subtask 32-31-00-810-082-A

A. Procedure
(1) Interchange the LGCIU 1 with LGCIU 2 AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(a) If there is no fault:
1 Put the LGCIUs back to their initial positions.
2 Replace the LGCIU-1 [5GA1] .
(b) If the fault continues, do step (2).

NOTE: The aft cargo door handle proximity switch is connected only to the LGCIU 1 position.

(2) Get access to the PROX SW-HANDLE, AFT CARGO COMPT DOOR [34WV] AMM 52-71-12-000-001.
(a) If the 38-368-02 UNIT-TEST,SENSOR or the 38-368-03 UNIT-TEST,SENSOR is available, do the troubleshooting procedure of the proximity sensor 32-31-00-03 TSM TASK 32-31-00-03.
(b) If the 38-368-02 UNIT-TEST,SENSOR or the 38-368-03 UNIT-TEST,SENSOR is not available, continue the test.
(c) Release the electrical-connector from the PROX SW-HANDLE, AFT CARGO COMPT DOOR [34WV] .
(d) Use the MULTIMETER - STANDARD and do a check of the resistance between pins A and B of the proximity sensor ASM 315405. Make sure that the resistance is:

Between 11 and 13 ohms for a ferrite proximity sensor (PN 8-484-01)
Between 15 and 17 ohms for an all metal proximity sensor (PN 8-933-01).

(e) Use a TESTER - INSULATION RESISTANCE to do a circuit isolation check between pins AB and the case of the isolation tester, which must be at ground potential:
(f) Make sure that the resistance is more than 400 Megohms.
(g) Connect the connector disconnected in step (c).
(3) If one of the checks in step (2) is unsatisfactory, replace the PROX SW-HANDLE, AFT CARGO COMPT DOOR [34WV] AMM 52-71-12-000-001 and AMM 52-71-12-400-001.
(4) Do the test in Para. 3.A:

If the fault continues do step (5).

(5) If the checks in step (2) are satisfactory, then:
(a) Do a check of the wiring between the proximity sensor electrical-connector and the LGCIU 1 ARINC tray ASM 315405.
(6) Do the test in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:31:22 UTC