DOC AIRBUS | TSM A320FNLG Does Not Downlock
TASK 32-31-00-810-862-A
NLG Does Not Downlock
A. Referenced Information
3. Fault Confirmation
Subtask 32-31-00-860-094-A
Subtask 32-31-00-810-120-A
[Rev.8 from Aug 2018]
2026.04.04 04:31:24 UTC
NLG Does Not Downlock
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:
1. Possible Causes- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
- NLG proximity sensor and target clearances
- NLG downlock springs and attachments
- NLG hinge bearing
- ACTG CYL-NLG [2527GM]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 32-21-00-200-004 | Inspection/Check of the Clearance of the Nose-Gear Hinge Bearings |
| AMM 32-21-00-200-005 | Detailed Inspection/Check of the NLG |
| AMM 32-30-00-200-002 | Visual Check of NLG and MLG Downlock Springs and Attachments |
| AMM 32-31-00-200-001 | Detailed Inspection of Gear Uplock and Door Uplock Units and Rollers |
| AMM 32-31-00-720-003 | Functional Test of the Normal Extension and Retraction of the Nose Landing Gear |
| AMM 32-31-22-000-001 | Removal of the NLG Actuating Cylinder |
| AMM 32-31-22-400-001 | Installation of the NLG Actuating Cylinder |
| AMM 32-31-73-200-002 | Inspection of the NLG Proximity Sensor and Target Clearances |
| AMM 32-33-00-720-001 | Functional Check of Free-Fall Extension |
Subtask 32-31-00-860-094-A
A. Procedure
(1) If it was necessary to do a gravity extension of the landing gear (because of the NLG downlock fault), do the Aircraft Configuration procedure AMM 32-33-00-720-001.
(2) Do a check of the post flight report:
4. Fault Isolation(1) If it was necessary to do a gravity extension of the landing gear (because of the NLG downlock fault), do the Aircraft Configuration procedure AMM 32-33-00-720-001.
(2) Do a check of the post flight report:
- If there is a L/G SYS DISAGREE ECAM message and related NLG downlock target-position CFDS message
or - If there is a NLG DOES NOT DOWNLOCK CFDS message shown.
Subtask 32-31-00-810-120-A
A. Procedure
(2) Do the inspection of the NLG proximity sensor and target clearances AMM 32-31-73-200-002
(3) Do the visual check of the NLG downlock springs and attachments AMM 32-30-00-200-002.
(4) Do the inspection/check of the clearance of the NLG hinge bearing AMM 32-21-00-200-004.
(5) Do the detailed inspection of the NLG gear uplock and door uplock units and rollers AMM 32-31-00-200-001.
(6) If necessary, correct fault(s) that you find.
(7) Do the functional test of the normal extension and retraction of the nose landing gear AMM 32-31-00-720-003.
(8) If the fault continues, the NLG is slow to operate or the fault continues after the subsequent flight, replace the ACTG CYL-NLG [2527GM] AMM 32-31-22-000-001 and AMM 32-31-22-400-001.
NOTE: The procedure that follows gives the information necessary to identify mechanical faults related to the NLG.
(1) Do the detailed inspection/check of the nose landing gear AMM 32-21-00-200-005. (2) Do the inspection of the NLG proximity sensor and target clearances AMM 32-31-73-200-002
(3) Do the visual check of the NLG downlock springs and attachments AMM 32-30-00-200-002.
(4) Do the inspection/check of the clearance of the NLG hinge bearing AMM 32-21-00-200-004.
(5) Do the detailed inspection of the NLG gear uplock and door uplock units and rollers AMM 32-31-00-200-001.
(6) If necessary, correct fault(s) that you find.
(7) Do the functional test of the normal extension and retraction of the nose landing gear AMM 32-31-00-720-003.
(8) If the fault continues, the NLG is slow to operate or the fault continues after the subsequent flight, replace the ACTG CYL-NLG [2527GM] AMM 32-31-22-000-001 and AMM 32-31-22-400-001.