L/G Doors Uncommanded Opening in Flight

TASK 32-31-00-810-853-A
L/G Doors Uncommanded Opening in Flight

1. Possible Causes

RELAY-GND SERVICE BUS CHG OVER [53GA]
[48GA]
SAFETY VALVE-L/G SYS ISOLATION [49GA]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-31-00-720-005	Functional Test of the MLG Safety Valve Solenoid
ASM 323105
ASM 323107
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

3. Fault Confirmation
Subtask 32-31-00-700-051-A

A. Test
(1) If the landing gear doors have opened in flight when not commanded:

Do the functional test of the MLG safety valve solenoid AMM 32-31-00-720-005.

4. Fault Isolation
Subtask 32-31-00-810-111-A

A. Procedure
(1) If the safety valve failed the test in Para. 3. A., replace the components that follow:
(a) RELAY-GND SERVICE BUS CHG OVER [53GA] ASM 323105.
(b) [48GA] ASM 323107.
(c) SAFETY VALVE-L/G SYS ISOLATION [49GA] AMM 32-31-17-000-001 and AMM 32-31-17-400-001.
(2) After the subsequent flight, make sure that the fault does not continue.

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