L/G and Doors Will Not Operate After Selection

TASK 32-31-00-810-808-A
L/G and Doors Will Not Operate After Selection

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

aircraft CAS was more than 260kt when the L/G selection was set to down,
ADIRU-1 [1FP1]
ADIRU-3 [1FP3]
PRIORITY VALVE [1064GM]
SAFETY VALVE-L/G SYS ISOLATION [49GA]
RELAYS, HERMETICAL [62GA]
aircraft wiring
[41GA]
[40GA]

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

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
AMM 29-11-33-000-001	Removal of the Priority Valve of the Green Hydraulic System
AMM 29-11-33-400-001	Installation of the Priority Valve of the Green Hydraulic System
AMM 32-31-00-720-002	Functional Test of the Normal Extension and Retraction of the Landing Gear
ASM 323107
AMM 32-31-12-000-001	Removal of the Landing-Gear (L/G) Selector Valve
AMM 32-31-12-400-001	Installation of the Landing-Gear (L/G) Selector Valve
AMM 32-31-17-000-001	Removal of the Landing Gear Safety-Valve
AMM 32-31-17-400-001	Installation of the Landing Gear Safety-Valve
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 34-13-00-740-003	SYSTEM TEST of the ADR
L/G Solenoid Safety Valve 49GA location

3. Fault Confirmation
Subtask 32-31-00-865-067-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
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32

Subtask 32-31-00-860-050-B

B. Test

NOTE: If the CAS (calibrated air speed) is more than 260kt, the safety valve (49GA) will isolate the green hydraulic supply to the landing gear and doors. This will prevent the L/G extension at high speeds so that no damage can occur. If the aircraft CAS was more than 260kt when the L/G selection was set to down, and there were no related messages/warnings, the system function was correct. No more maintenance steps are necessary.

(1) If the Flap and Slat system has operated at half speed, and the L/G has not operated, do Para. 4.A.(1).
(2) If the Flap and Slat system operation is correct:
(a) Do the functional test of the L/G AMM 32-31-00-720-002 up to and to include Para. 'Aircraft Maintenance Configuration' only.
(b) Wait for a minimum of 15 minutes. This lets the electrical and hydraulic systems get to their operational temperature and become stable.
(c) Do a reset of the C/Bs that follow:
1 Open, safety and tag this(these) circuit breaker(s):

1GA
2GA
52GA
58GA
59GA.

2 Wait for a minimum of 15 seconds.
3 Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

1GA
2GA
52GA
58GA
59GA.

(d) Complete the functional test of the L/G AMM 32-31-00-720-002 from Para. 'Removal of the Safety Devices':
1 If the functional test is OK:
a Do the Fault Isolation from Para. 4.A.(4).
2 In the functional test, if the L/G did not operate:
a Do the Fault Isolation from Para. 4.A.(2).
3 If the L/G doors operate correctly but the L/G does not:
a Do the Fault Isolation from Para. 4.A.(8).
(3) If a fault of the ADIRU-1 [1FP1] and ADIRU-3 [1FP3] is shown on the PFR, do the Fault Isolation from Para 4.A.(9).

4. Fault Isolation
Subtask 32-31-00-810-059-B

A. Procedure
(1) Replace the PRIORITY VALVE [1064GM] , AMM 29-11-33-000-001 and AMM 29-11-33-400-001:

Do the test in Para 3.B.(2).

(2) At the SAFETY VALVE-L/G SYS ISOLATION [49GA] , release the electrical connector 49GA-A.

L/G Solenoid Safety Valve 49GA location

(3) Do a check for 28VDC at the free end of connector 49GA-A ASM 323107:

If 28VDC is available, do step (6)
If 28VDC is not available, connect the connector 49GA-A and do the next step.

(4) Replace the RELAYS, HERMETICAL [62GA] :
(a) Do the functional test in Para. 3.B.(2):

If the fault continues, do the next step.

(5) Do a check and repair the aircraft wiring as necessary ASM 323107:
(a) Do the functional test in Para. 3.B.(2):

If the doors and L/G did not operate, do the next step.

(6) Replace the SAFETY VALVE-L/G SYS ISOLATION [49GA] , AMM 32-31-17-000-001 and AMM 32-31-17-400-001:

If the fault continues, 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) Replace the [40GA] AMM 32-31-12-000-001 and AMM 32-31-12-400-001.
(9) Do the system test of the ADR AMM 34-13-00-740-003:

If the test gives a fault message, do the related trouble shooting procedure.

5. Close-up
Subtask 32-31-00-942-050-A

A. Procedure
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:31:19 UTC