DOC AIRBUS | AMM A320FInspection after Significant MLG Vibration at Touch-Down
TASK 05-51-31-200-001-A
Inspection after Significant MLG Vibration at Touch-Down
1. Reason for the Job
This inspection is recommended to make sure that the bottom cardan joint and the torque link installation are in a serviceable condition if significant MLG vibration occurs at touchdown.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 05-51-31-860-050-A
Subtask 05-51-31-220-050-A
Subtask 05-51-31-586-050-A
[Rev.10 from 2021]
2026.03.31 22:51:53 UTC
Inspection after Significant MLG Vibration at Touch-Down
1. Reason for the Job
This inspection is recommended to make sure that the bottom cardan joint and the torque link installation are in a serviceable condition if significant MLG vibration occurs at touchdown.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | 1 | GAGE - SET, FEELER |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | WARNING NOTICE(S) |
| 460005834 | 1 | TUBE SPANNER |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.06AAB1) | Polysulfide Sealant-General Purpose Fillet - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 07-11-00-581-001-A | Lifting for Aircraft Maintenance Operations |
| TASK 07-11-00-586-002-A | Lowering of the Aircraft for Maintenance Operations |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 32-00-00-481-001-A | Installation of the Safety Devices on the Landing Gears |
| TASK 32-11-16-000-001-A | Removal of the MLG Side-Stay Assembly - Pre-EV MLG |
| TASK 32-11-16-000-001-A-01 | Removal of the MLG Side Stay Assembly - Post-EV MLG |
| TASK 32-11-16-400-001-A | Installation of the MLG Side-Stay Assembly - Pre-EV MLG |
| TASK 32-11-16-400-001-A-01 | Installation of the MLG Side Stay Assembly - Post-EV MLG |
| TASK 32-11-18-400-001-A | Installation of the MLG Side-Stay - Pre-EV MLG |
| TASK 32-11-18-400-001-A-01 | Installation of the MLG Side Stay - Post-EV MLG |
| TASK 32-11-27-200-001-A | Functional Check of MLG Torque Links for Excessive Play |
| TASK 32-11-27-210-001-A | Detailed Inspection of the Torque-Link Damper-Assemblies |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
| TASK 32-12-00-410-001-A | Close the Main Gear Doors after Access |
| TASK 32-31-00-720-002-A | Functional Test of the Normal Extension and Retraction of the Landing Gear |
| TASK 32-33-00-720-001-A | Functional Check of Free-Fall Extension |
Bottom Cardan Joint with One Flange - ClearancesSubtask 05-51-31-860-050-A
A. Aircraft Maintenance Configuration
(1) Make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).
(2) Make sure that the hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).
Subtask 05-51-31-481-050-A (1) Make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).
(2) Make sure that the hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).
B. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the safety devices are installed on the landing gears (Ref. AMM TASK 32-00-00-481-001).
(3) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the aircraft systems.
Subtask 05-51-31-010-050-A (1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the safety devices are installed on the landing gears (Ref. AMM TASK 32-00-00-481-001).
(3) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the aircraft systems.
C. Get Access
(1) Open and safety the main gear doors (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position near the MLG.
Subtask 05-51-31-110-050-A (1) Open and safety the main gear doors (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position near the MLG.
D. Cleaning
(1) Remove the sealant from the Stalock nut on the MLG side stay bottom cardan joints with Textile-Lint free Cotton - (Material No.14SBA1) soaked in Non Aqueous Cleaner-General - - (Material No.08BAA9) .
4. Procedure(1) Remove the sealant from the Stalock nut on the MLG side stay bottom cardan joints with Textile-Lint free Cotton - (Material No.14SBA1) soaked in Non Aqueous Cleaner-General - - (Material No.08BAA9) .
Subtask 05-51-31-220-050-A
A. Inspection of the MLG Side Stay
(Ref. AMM TASK 32-11-16-000-001) (Ref. AMM TASK 32-11-16-400-001) (Ref. AMM TASK 07-11-00-581-001).
Subtask 05-51-31-210-051-A (Ref. AMM TASK 32-11-16-000-001) (Ref. AMM TASK 32-11-16-400-001) (Ref. AMM TASK 07-11-00-581-001).
NOTE: All the necessary inspections are visual unless the text gives other instructions.
NOTE: Use a GAGE - SET, FEELER to measure the gaps. Use a 460005834 TUBE SPANNER to torque the nut.
| ITEM | INSP CODE | INSPECTION TASKS | PHASE 1 | PHASE 2 | PHASE 3 | INSP SIGN | REF. FIG. |
|---|---|---|---|---|---|---|---|
| 1. | | Inspection of the MLG Side Stay Bottom Cardan Joint | | | | | |
| A. | | Do a visual inspection of the flanges of the bottom cardan joint bushes as far as possible for cracks, distorsion. Do not remove the cardan joint pins. It is very important to examine the lower flange of the lower cardan joint bushes at the outboard position nearest the leg. | X | | | | |
| 2. | | Inspection of the Gaps of the MLG Side Stay | | | | | |
| A. | | Use feeler gauges to measure the maximum gaps at the side stay cardan joint installations: - dimension C - dimension D Make a record of the values. The total clearance E = (Cmax + Dmax) must be between: - 0.043 mm (0.0017 in.) and - 0.50 mm (0.0197 in.). NOTE: The gaps may vary around the pin/bush circumference. This is acceptable provided the sum of the maximum gaps is not more than 0.5 mm (0.0196 in.). If the clearance is outside the limits: | X | | | | |
| | | (1) Measure the load on the bottom Stalock nut as follows: | | X | | | |
| | | (a) Lift the aircraft (Ref. AMM TASK 07-11-00-581-001). | | | | | |
| | | (b) Remove the circlips as follows: - use an applicable tool to release the tail of the circlip from the key slot of the locking washer, - hold the tail of the circlip, - carefully pull the circlip (clockwise) until it is released from the chamfered slot in the nut. (c) Remove the locking washer from the nut. (d) Mark the position of the nut with a pencil line. (e) Loosen the nut and install the nut at the initial position and tighten with the 460005834 TUBE SPANNER. (f) Make sure that the torque value is 18 m.daN (132.74 lbf. ft). | | | | | |
| | | (2) Remove the bottom cardan joint and check of the following dimensions: (Ref. AMM TASK 32-11-16-000-001) - dimension A between 137.917 mm (5.429 in.) and 137.957 mm (5.431 in.), - dimension B between 138 mm (5.433 in.) and 138.06 mm (5.435 in.). | | X | | | |
| | | (a) If the dimension A is out of tolerance: 1_ Replace the bottom cardan flange bushes. Refer to the related CMM. | | | X | | |
| | | (b) If the dimension B is out of tolerance: 1_ Replace the bottom cardan pin. Refer to the related CMM. | | | X | | |
| | | (3) Install the bottom cardan joint (Ref. AMM TASK 32-11-16-400-001). | | X | | | |
| | | (4) Make sure that the MLG Side-Stay gap is in the tolerance: - Do step 2.A. again. | | X | | | |
| | | (5) Close the main landing gear doors (Ref. AMM TASK 32-12-00-410-001). | | X | | | |
| | | (6) Remove the access platform(s). | | X | | | |
| | | (7) Do a functional test of the extension and retraction of the main landing gear (Ref. AMM TASK 32-31-00-720-002). | | X | | | |
| | | (8) Do a functional test of the free-fall extension system (Ref. AMM TASK 32-33-00-720-001). | | X | | | |
B. Inspection of the MLG Torque Links (Ref. AMM TASK 32-11-27-200-001)
Subtask 05-51-31-210-052-A ** ON A/C NOT FOR ALL NOTE: All the necessary inspections are visual unless specified differently in the text.
| ITEM | INSP CODE | INSPECTION TASKS | PHASE 1 | PHASE 2 | PHASE 3 | INSP SIGN | REF. FIG. |
|---|---|---|---|---|---|---|---|
| 1. | | Inspection of the MLG Torque Links | | | | | |
| A. | | (a) Do a Visual Inspection of the MLG torque links for cracks, distortion. | X | | | | |
| | | (b) Do a check of the torque link gaps (Ref. AMM TASK 32-11-27-200-001). | X | | | | |
| | | (c) Do a Magnetic Particle NDT check for cracks at the apex lug of the MLG torque links NOTE: The CMM gives a Magnetic Particle NDT check | X | | | | |
C. Inspection of the MLG Torque Link Damper (Ref. AMM TASK 32-11-27-210-001)
Subtask 05-51-31-210-052-B ** ON A/C NOT FOR ALL NOTE: All the necessary inspections are visual unless specified differently in the test.
| ITEM | INSP CODE | INSPECTION TASKS | PHASE 1 | PHASE 2 | PHASE 3 | INSP SIGN | REF. FIG. |
|---|---|---|---|---|---|---|---|
| 1. | | Inspection of the MLG Torque Link Damper | | | | | |
| A. | | Do a detailed inspection of the torque link damper (Ref. AMM TASK 32-11-27-210-001). | X | | | | |
C. Not Applicable
5. Close-upSubtask 05-51-31-586-050-A
A. Lowering of the Aircraft
(1) If the aircraft is jacked, lower the aircraft onto its wheels (Ref. AMM TASK 07-11-00-586-002).
Subtask 05-51-31-914-051-A (1) If the aircraft is jacked, lower the aircraft onto its wheels (Ref. AMM TASK 07-11-00-586-002).
B. Protection
(1) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the end of the cardan joint.
Subtask 05-51-31-942-050-A (1) Apply Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the end of the cardan joint.
C. Put the aircraft back to its initial configuration.
(1) Remove the WARNING NOTICE(S).
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Make sure that the work area is clean and clear of tools and other items.
(1) Remove the WARNING NOTICE(S).
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Make sure that the work area is clean and clear of tools and other items.