L/G Failure of one of the uplock proximity sensors 8GA thru 13GA

TASK 32-31-00-810-846-A
L/G Failure of one of the uplock proximity sensors 8GA thru 13GA

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: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.

1. Possible Causes

PROX SNSR-R L/G UPLK, SYS 1 [8GA]
PROX SNSR-L L/G UPLK, SYS 1 [9GA]
PROX SNSR-NLG UPLK, SYS 1 [12GA]
PROX SNSR-R L/G UPLK, SYS 2 [10GA]
PROX SNSR-L L/G UPLK, SYS 2 [11GA]
PROX SNSR-NLG UPLK, SYS 2 [13GA]
UPLOCK ASSY-MLG, L [2509GM]
UPLOCK ASSY-MLG, R [2510GM]
UPLOCK ASSY-NLG [2530GM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 29-10-00-863-001	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-001	Depressurize the Green Hydraulic System
AMM 32-00-00-860-001	Flight Configuration Precautions with Electrical Power
AMM 32-12-00-010-001	Open the Main Gear Doors for Access
AMM 32-22-00-010-001	Nose Gear Doors - Ground Doors Opening
AMM 32-31-21-000-001	Removal of the NLG Uplock Assy
AMM 32-31-21-400-001	Installation of the NLG Uplock Assy
AMM 32-31-44-000-001	Removal of the MLG Uplock Assembly
AMM 32-31-44-400-001	Installation of the MLG Uplock Assembly
AMM 32-31-73-000-001	Removal of the MLG Proximity-Sensors
AMM 32-31-73-000-005	Removal of the NLG Proximity-Sensors
AMM 32-31-73-400-001	Installation of the MLG Proximity-Sensors
AMM 32-31-73-400-005	Installation of the NLG Proximity-Sensors

3. Fault Confirmation
Subtask 32-31-00-710-065-A

A. For the fault confirmation do the fault isolation.

4. Fault Isolation
Subtask 32-31-00-810-104-A

A. Procedure
(1) Open the NLG doors AMM 32-22-00-010-001 and the MLG doors AMM 32-12-00-010-001.
(a) Do the flight configuration precautions AMM 32-00-00-860-001, and make sure that all the aircraft systems are in the ground configuration.
(b) Make sure that LGCIU 1 and 2 are installed and are serviceable.
(c) Depressurize the green hydraulic system AMM 29-10-00-864-001.

Subtask 32-31-00-865-058-A

B. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32

Subtask 32-31-00-810-105-A

C. Do the procedure that follows:
(1) For proximity sensors PROX SNSR-R L/G UPLK, SYS 1 [8GA] , PROX SNSR-L L/G UPLK, SYS 1 [9GA] and PROX SNSR-NLG UPLK, SYS 1 [12GA] .
(a) Open safety and tag the circuit breaker 2GA (and 59GA if installed).

NOTE: This makes sure that the LGCIU 1 shows the condition of the uplocks.

(b) On the ECAM wheel page, only the three left hand side green triangles are shown.
(c) Use an applicable tool to move the MLG uplocks 2509GM and 2510GM and the NLG uplock 2530GM to the closed and locked position.

WARNING: DO NOT PUT YOUR FINGERS IN THE UPLOCK MECHANISM. THIS IS DANGEROUS.

(d) On the ECAM wheel page, an amber UP LOCK message shows above each of the three green triangles.

if the amber UP LOCK message is not shown, replace the applicable proximity sensor as follows:
for the NLG uplock proximity sensor 12GA AMM 32-31-73-000-005 and AMM 32-31-73-400-005
for the MLG uplocks proximity sensors 8GA and 9GA AMM 32-31-73-000-001 and AMM 32-31-73-400-001.

(2) For proximity sensors PROX SNSR-R L/G UPLK, SYS 2 [10GA] , PROX SNSR-L L/G UPLK, SYS 2 [11GA] and PROX SNSR-NLG UPLK, SYS 2 [13GA] .
(a) Remove the safety clip and the tag and close the circuit breaker 2GA. Keep the battery circuit breaker 59GA open (if installed).
(b) Open safety and tag the circuit breakers 1GA, 52GA (and 58GA if installed).

NOTE: This makes sure that the LGCIU 2 shows the condition of the uplocks.

(c) On the ECAM wheel page, the three right hand side green triangles are shown.
(d) On the ECAM wheel page, an amber UP LOCK message shows above each of the three green triangles.

If the amber UP LOCK message is not shown, replace the applicable proximity sensor as follows:
for the NLG uplock proximity sensor 13GA AMM 32-31-73-000-005 and AMM 32-31-73-400-005.
for the MLG uplocks proximity sensors 10GA and 11GA AMM 32-31-73-000-001 and AMM 32-31-73-400-001

NOTE: To do a check of a L/G proximity sensor before removal (Ref. page block 301).

(3) After a proximity sensor has been replaced, to test the proximity sensor, do the applicable part of the fault isolation again (Ref. Para 4.).
(a) Pressurize the green hydraulic system to open and unlock the L/G uplocks AMM 29-10-00-863-001.
(b) Depressurize the green hydraulic system AMM 29-10-00-864-001.
(4) If the fault continues, the uplock proximity sensor to target clearance is at fault. Replace the applicable uplock:

For MLG UPLOCK ASSY-MLG, L [2509GM] or UPLOCK ASSY-MLG, R [2510GM] , AMM 32-31-44-000-001 and AMM 32-31-44-400-001
For NLG UPLOCK ASSY-NLG [2530GM] , AMM 32-31-21-000-001 and AMM 32-31-21-400-001.

(5) After an uplock has been replaced, to test the uplock, do the applicable part of the fault isolation again (Ref. Para 4.).

[Rev.8 from Aug 2018] 2026.04.04 04:31:23 UTC