L/G Doors Selector Valve System Fault

TASK 32-31-00-810-807-A
L/G Doors Selector Valve System Fault

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]
[41GA]
aircraft 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

B. Referenced Information

REFERENCE	DESIGNATION
AMM 32-31-00-710-002	Operational Test of the Landing Gear Doors (With False Targets)
ASM 323105
ASM 323106
AMM 32-31-34-000-001	Removal of the Landing-Gear (L/G) Door Selector Valve
AMM 32-31-34-400-001	Installation of the Landing-Gear (L/G) Door Selector Valve
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU

3. Fault Confirmation
Subtask 32-31-00-865-062-A

A. 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

Subtask 32-31-00-810-057-A

B. Test
(1) If the ECAM WARNING 'LGCIU2 FAULT' is shown after the L/G Free Fall extension has been operated in flight:

No more maintenance steps are necessary.

NOTE: The ECAM WARNING can be shown with the failure message
'L/G DOORS SEL VALVE 41GA'.

(2) Do an operational test of the L/G doors with the two LGCIUs:
(a) Do a reset of LGCIU-2:

NOTE: This will make sure LGCIU-1 controls the L/G system.

1 Open the circuit breaker 2GA.
2 Wait for a minimum of 15 seconds.
3 Close the circuit breaker CB 2GA.

NOTE: If the L/G doors are open and do not close (the L/G doors are not in the correct configuration for the operational test) go to step 4.A.(4).

(b) Do an operational test of the L/G doors AMM 32-31-00-710-002.
(c) Do a reset of LGCIU-1:

NOTE: This will make sure LGCIU-2 controls the L/G system.

1 Open the circuit breakers that follow:

1GA
52GA.

2 Wait for a minimum of 15 seconds.
3 Close the circuit breakers that follow:

1GA
52GA.

(d) Do an operational test of the L/G doors AMM 32-31-00-710-002.
(3) From the results of the two tests done in step (2):
(a) If the two operational tests are OK:

No more maintenance steps are necessary.

(b) If one of the operational tests is not OK:

Make a record of the system in which the fault occurred and do the procedure in Para. 4.A.(1).

Do the procedure in Para. 4.A.(4).

4. Fault Isolation
Subtask 32-31-00-810-058-A

A. Procedure
(1) Interchange the LGCIU-1 [5GA1] with LGCIU-2 [5GA2] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(2) Do the operational tests in Para. 3.B. and make a record of the result:

If the fault stays in the same system, do step (4)
If the fault moves to the opposite system, do the next step.

(3) Replace the LGCIU in the unserviceable system. Make sure that the servicable LGCIU is installed in its initial position.
(a) Do the tests in Para. 3.B.:

If the fault continues, do the next step.

(4) Do a check for a leak from the hydraulic system, adjacent to the flexible hoses attached to the door actuator:

If there is no leak, do the next step.

(5) Use a MULTIMETER - STANDARD to do a check of the SEL-VALVE-L/G DOORS (41GA) solenoid, in the unserviceable system ASM 323105 ASM 323106:

NOTE: Connector A is in System 1 and connector B is in System 2.

(a) Do a check of the resistance between pins C and E. Do the check again for pins B and F. The resistance must be between 53 ohms and 78 ohms.
(b) Connect together pins C and E, and connect together pins B and F.
(c) Connect one test lead of the TESTER - INSULATION RESISTANCE to the pins C and E and the other test lead to pin D. Do the test again for pins B and F. The resistance value must be more than 400 Megohms.
(6) From the results of the two tests in step (5):

If the two tests are OK, do step (8)
If a solenoid fails one of the two tests, do the next step.

(7) Replace the [41GA] , AMM 32-31-34-000-001 and AMM 32-31-34-400-001:

If the fault continues, do the next step.

(8) Do a check and repair the aircraft wiring between the LGCIU in the unserviceable system and the solenoid of the SEL-VALVE-L/G DOORS (41GA) ASM 323105 ASM 323106.
(9) Do the operational tests in Para. 3.B. for the unserviceable system only.

If the fault continues and the SEL-VALVE-L/G DOORS (41GA) has not been replaced, do step (7) only.

[Rev.8 from Aug 2018] 2026.04.04 04:40:15 UTC