W DOC AIRBUS | TSM A320F

L/G Selector Valve Fault

TASK 32-31-00-810-806-A
L/G Selector Valve 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
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 31-32-00-860-009
Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
AMM 32-31-00-710-012
Operational Check of Landing Gear Selector Valve with Aircraft on Ground
AMM 32-31-00-720-002
Functional Test of the Normal Extension and Retraction of the Landing Gear
ASM 323105
ASM 323106
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 32-31-71-000-001
Removal of the LGCIU
AMM 32-31-71-400-001
Installation of the LGCIU
3. Fault Confirmation
Subtask 32-31-00-810-055-A
A. Test
   (1) If the message L/G SEL VALVE 40GA is shown, on the Post Flight Report (PFR) and there was no malfunction of the L/G:
  • do the Fault Isolation procedure given in Para. 4.A. (1).
   (2) If the message L/G SEL VALVE 40GA is shown, on the Post Flight Report (PFR) and there was a malfunction of the L/G:
  • do the Fault Isolation procedure given in Para. 4.A. (2).
4. Fault Isolation
Subtask 32-31-00-810-056-A
A. Procedure
   (1) Do the Operational Check of Landing Gear Selector Valve 40GA with Aircraft on Ground, AMM 32-31-00-710-012.
     (a) If the test is OK, no more maintenance action is necessary.
     (b) If the test is not OK, replace the [40GA] AMM 32-31-12-000-001 and AMM 32-31-12-400-001.
   (2) Interchange the LGCIU 1 with the LGCIU 2 AMM 32-31-71-000-001, AMM 32-31-71-400-001.
   (3) Do the functional test of the normal extension and retraction of the landing gear, two times AMM 32-31-00-720-002.
NOTE: The LGCIU in control changes over from LGCIU 1 (2) to LGCIU 2 (1), when the L/G selector lever is moved from the DOWN selection.
   (4) Get access to the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009 and do the GROUND SCANNING of LGCIU 1 and LGCIU 2, for the L/G SEL VALVE 40GA fault message:
  • if the fault stays in the initial system, go to Para. (8).
  • if the fault moves to the opposite system, do the next step.
   (5) Replace the LGCIU-1 [5GA1] or LGCIU-2 [5GA2] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001, which shows the fault.
   (6) Make sure that the serviceable LGCIU is installed in its initial postion.
   (7) Do the test given in Para. (3):
  • if the fault continues, do the next step.
   (8) Do a check and repair the aircraft wiring between the LGCIU 1 (2) and the selector valve (40GA) ASM 323105 ASM 323106.
   (9) Do the test given in Para. (3):
  • if the fault continues, do the next step.
   (10) Replace the [40GA] , AMM 32-31-12-000-001 and AMM 32-31-12-400-001.
5. Close-up
Subtask 32-31-00-942-052-A
A. Remove the ground support and maintenance equipment, the special and standard tools and all other items.
Subtask 32-31-00-860-063-A
B. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:31:19 UTC
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