RLG Door Closed Proximity Sensor Fault

TASK 32-31-00-810-819-A
RLG Door Closed Proximity Sensor Fault

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.

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.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

1. Possible Causes

LGCIU-1 [5GA1]
LGCIU-2 [5GA2]
PROX SNSR-R L/G DOOR CLOSED, SYS 1 [26GA]
PROX SNSR-R L/G DOOR CLOSED, SYS 2 [28GA]
aircraft wiring/connectors

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-31-00-040-003	Check of the System 2 Proximity Sensors of the Landing Gear and the Landing Gear Doors
ASM 323103
ASM 323104
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU
AMM 32-31-73-000-001	Removal of the MLG Proximity-Sensors
AMM 32-31-73-400-001	Installation of the MLG Proximity-Sensors
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

3. Fault Confirmation
Subtask 32-31-00-740-059-A

A. Test
(1) Do a BITE test with the LGCIU that gave the door closed proximity sensor message AMM 32-69-00-740-001:

if a R L/G DOOR CLOSED PROX SNSR message is shown, do the fault isolation procedure in Para. 4.A.
if a maintenance message is shown, which is not related R L/G proximity sensors 26GA or 28GA, do the trouble shooting procedure related to the maintenance message.
if a maintenance message is not shown, no more maintenance work is necessary.

4. Fault Isolation
Subtask 32-31-00-810-070-A

A. Procedure
(1) Interchange LGCIU1 with LGCIU2 AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(2) Do the test in Para. 3. A. with the LGCIU 1 and LGCIU 2:
(a) If the fault stays in the same system as in the initial test, do step (4).
(b) If the fault moves to the other system, do the subsequent step.
(3) Replace the unserviceable LGCIU-1 [5GA1] or LGCIU-2 [5GA2] , which gave the maintenance message, AMM 32-31-71-000-001 and AMM 32-31-71-400-001:
(a) If the fault continues, do the subsequent step.
(4) Replace the applicable PROX SNSR-R L/G DOOR CLOSED, SYS 1 [26GA] or PROX SNSR-R L/G DOOR CLOSED, SYS 2 [28GA] , AMM 32-31-73-000-001 and AMM 32-31-73-400-001:
(a) If the fault continues, do the subsequent step.
(5) Do a check and repair as necessary the aircraft wiring/connectors between the applicable proximity sensor and the related LGCIU, ASM 323103 or ASM 323104.
(6) Do the test in Para. 3. A.
(7) If MMEL conditions apply to the PROX SNSR-R L/G DOOR CLOSED, SYS 2 [28GA] :
(a) Do the deactivation of the proximity sensor AMM 32-31-00-040-003.

[Rev.8 from Aug 2018] 2026.04.04 04:31:20 UTC