W DOC AIRBUS | TSM A320F

L/G or L/G Door Uplock TGT POS Fault (sensors 8GA thru 13GA and 26GA thru 31GA)

TASK 32-31-00-810-837-A
L/G or L/G Door Uplock TGT POS Fault (sensors 8GA thru 13GA and 26GA thru 31GA)

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.
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.
1. Possible Causes
  • L/G or L/G door slow to operate
  • UPLOCK ASSY-MLG, L [2509GM]
  • UPLOCK ASSY-MLG, R [2510GM]
  • UPLOCK ASSY-NLG [2530GM]
  • UPLOCK ASSY-MLG DOOR, L [2521GM]
  • UPLOCK ASSY-MLG DOOR, R [2520GM]
  • UPLOCK ASSY-NLG DOOR [2534GM]
  • LGCIU-1 [5GA1]
  • LGCIU-2 [5GA2]
  • Aircraft wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 32-31-00-810-859-A
NLG Doors Do Not Close Fully or Slow to Operate
TSM TASK 32-31-00-810-860-A
MLG Door (LH) Does Not Close Fully or Slow to Operate
TSM TASK 32-31-00-810-861-A
MLG Door (RH) Does Not Close Fully or Slow to Operate
TSM TASK 32-31-00-810-865-A
NLG Does Not Uplock
TSM TASK 32-31-00-810-866-A
MLG (LH) Does Not Uplock
TSM TASK 32-31-00-810-867-A
MLG (RH) Does Not Uplock
AMM 32-31-00-710-002
Operational Test of the Landing Gear Doors (With False Targets)
AMM 32-31-00-720-002
Functional Test of the Normal Extension and Retraction of the Landing Gear
ASM 323103
AMM 32-31-14-000-001
Removal of the NLG Door Uplock Assy
AMM 32-31-14-400-001
Installation of the NLG Door Uplock Assy
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 32-31-33-000-001
Removal of the MLG Door Uplock 2520GM
AMM 32-31-33-400-002
Installation of the MLG Door Uplock 2520GM
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 32-31-71-000-001
Removal of the LGCIU
AMM 32-31-71-400-001
Installation of the LGCIU
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
AMM 32-31-73-820-008
Inductance Check of the Proximity Sensors/Switches
AMM 32-31-73-820-009
Resistance Check of the Proximity Sensors
ASM 324304
3. Fault Confirmation
Subtask 32-31-00-740-077-A
A. Message Analysis
NOTE: Target position faults can only be confirmed by continuous monitoring (BITE) during the L/G operation.
   (1) If an UPLK PROX SNSR
or a
L/G DOOR CLOSED PROX SNSR TGT POS
message is shown on the Post Flight Report (PFR), on a set of sensors at the same time (+/- 1 minute), then the fault is L/G or L/G door slow to operate. In this condition, do the trouble shooting as follows:
   (2) If an UPLK PROX SNSR TGT POS or a L/G DOOR CLOSED PROX SNSR TGT POS message is shown on the PFR on one sensor only:
  • Record which LGCIU reported the fault and do the fault isolation procedure in Para. 4.A.
4. Fault Isolation
Subtask 32-31-00-810-088-A
A. Procedure
NOTE: Uplock proximity sensors are a part of the uplock assembly and can not be adjusted.
   (1) Do a check of the resistance of the applicable proximity sensor AMM 32-31-73-820-009:
  • if the resistance values are correct, do the next step
  • if one or more of the resistance values is not correct do step (3).
   (2) Do a check of the inductance of the applicable proximity sensor AMM 32-31-73-820-008:
  • if the inductance is correct, do step (6)
  • if the inductance is not correct, do next step.
   (3) Replace the applicable proximity sensor:
   (4) Do a check of the inductance of the new replacement sensor AMM 32-31-73-820-008 :
  • if the inductance is correct, no more maintenance work is necessary
  • if the inductance is not correct, do next step.
NOTE: If the inductance of the proximity sensor continues to be incorrect after replacement. The fault is with the sensor/target gap which cannot be adjusted. Thus the complete uplock must be replaced.
   (5) Replace the applicable uplock assembly as follows:
     (a) If the fault continues do the next step.
   (6) Do the applicable functional or operational test that follows:
  • for the proximity sensors 8GA, 9GA, 10GA, 11GA, 12GA or 13GA, do the Functional Test of the Normal Extension and Retraction of the Landing Gear AMM 32-31-00-720-002
  • for the proximity sensors 26GA, 27GA , 28GA, 29GA, 30GA or 31GA, do the Operational Test of the Landing Gear Doors AMM 32-31-00-710-002.
     (a) If the fault continues, do the next step.
   (7) Replace the applicable LGCIU-1 [5GA1] or LGCIU-2 [5GA2] which identified the fault, AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
   (8) Do a check of and repair as necessary the Aircraft wiring between the:
  • electrical connectors on the applicable proximity sensor and related LGCIU ARINC tray
    ASM 323103 or ASM 324304.
5. Close-up
Subtask 32-31-00-942-064-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:31:22 UTC
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