W DOC AIRBUS | TSM A320F

Vibrations Felt on the NLG during Take-Off and Lift-Off Phases

TASK 32-20-00-810-802-A
Vibrations Felt on the NLG during Take-Off and Lift-Off Phases

1. Possible Causes
  • NLG wheels
  • NLG wheel-axle sleeve
  • NLG torque-link assembly
  • NLG door
  • NLG wheel-bearing
  • NLG wheel and tire assembly
  • nose-gear hinge bearings
  • NLG shock absorber assembly
  • MLG wheels
  • brake unit
  • MLG wheel-axle sleeves
  • MLG torque-link damper-assemblies
  • MLG fixed-fairing
  • MLG wheel-bearing
  • MLG torque-link
  • MLG side-stay
2. Job Set-up Information
 A. Consumable Materials
REFERENCE
DESIGNATION
(Material No.03GBB1)
Synthetic Oil base Grease-General Purpose Clay Thickened -
(Material No.03GBC1)
Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. -
(Material No.03HBD9)
Synthetic Ester base Grease-General Purpose Low Temp -
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 07-11-00-581-001
Lifting for Aircraft Maintenance Operations
AMM 07-11-00-581-003
Lifting of the Aircraft at the Forward Jacking Point, MLG Wheels on the Ground
AMM 07-12-00-582-001
Jacking of the Nose Landing Gear
AMM 07-12-00-582-002
Jacking of the Main Landing Gear
AMM 12-12-32-610-001
Check NLG Shock Absorber Fluid Level and Charge Pressure ("Two-Point Check" - Aircraft on Jacks to start)
AMM 12-12-32-611-004
Check of MLG Shock Absorber Fluid Level
AMM 12-14-32-614-003
Check of MLG Shock Absorber Charge Pressure
AMM 12-22-32-640-001
Lubrication of Main Landing Gear and Doors
AMM 12-22-32-640-002
Lubrication of Nose Landing Gear and Doors
AMM 32-11-00-220-004
Inspection of the MLG Side Stay Attachment Lug(s) after the Aircraft has gone off the Runway
AMM 32-11-11-200-001
Check of MLG Torque Link Damper Fluid Level
AMM 32-11-16-400-001
Installation of the MLG Side-Stay Assembly
AMM 32-11-18-000-001
Removal of the MLG Side-Stay
AMM 32-11-27-200-001
Check of MLG Torque Links for Excessive Play
AMM 32-11-27-210-001
Detailed Inspection of the Torque-Link Damper-Assemblies
AMM 32-12-14-400-001
Installation of the MLG Fixed Fairing Assembly (That was Removed For Access Only)
AMM 32-21-00-200-004
Inspection/Check of the Clearance of the Nose-Gear Hinge Bearings
AMM 32-21-00-200-803
Special Detailed Inspection of the Torque-Link Center Hinge-Pin
AMM 32-21-00-200-804
Check of Plays at Upper and Lower Torque-Link Hinges
AMM 32-21-13-000-001
Removal of the NLG Shock Absorber Assy
AMM 32-21-13-400-001
Installation of the NLG Shock Absorber Assy
AMM 32-22-00-220-002
Check of the Aft Nose-Gears Door Gap
AMM 32-22-00-820-001
Adjustment of the NLG doors
AMM 32-41-00-210-002
Inspection/Check of the Wheels and Tires
AMM 32-41-00-210-003
Inspection/Check of the Tire Pressure
AMM 32-41-00-910-001
Tire Mixability Precautions
AMM 32-41-11-000-006
Removal of the MLG Wheel
AMM 32-41-11-400-006
Installation of the MLG Wheel
AMM 32-41-12-000-001
Removal of the NLG Wheel
AMM 32-41-12-000-002
Removal of the Axle Sleeve
AMM 32-41-12-400-001
Installation of the NLG Wheel
AMM 32-41-12-400-002
Installation of the Axle Sleeve
AMM 32-42-27-000-001
Removal of the Brake
AMM 32-42-27-400-001
Installation of the Brake
AMM 32-42-71-000-001
Removal of the MLG Axle Adaptor-Sleeves
AMM 32-42-71-400-001
Installation of the MLG Axle Adaptor-Sleeves
F Nose Wheel Vibration Reporting Sheet
3. Fault Confirmation
Subtask 32-20-00-700-052-A
A. Not applicable.
4. Fault Isolation
Subtask 32-20-00-810-052-A
A. Preliminary Checks Applicable to the MLG and NLG Areas
   (1) Do a check of the NLG tire references AMM 32-41-00-910-001.
NOTE: This procedure gives the approved tire mixability conditions for the aircraft. All the other conditions are not permitted. The information is given in SB A320-32-1007.
   (2) Do a check of the tire pressure on the NLG and MLG. Make sure that the measured pressure is in the limits of the normal operating range for the two tires on a same axle AMM 32-41-00-210-003.
   (3) Do a check of the tire wear and condition on the NLG and MLG AMM 32-41-00-210-002.
NOTE: Too much difference in wear between the tires installed on the same axle can cause vibrations.
   (4) Do a check for tire slippage on the rim. Make sure that the red mark on the tire is aligned with the inflation valve or with the wheel heavy-point, if indicated.
   (5) Do a check of the wheel rims for damage.
Subtask 32-20-00-810-056-A
B. Identification of the Cause of the Vibrations
NOTE: The vibrations can come from the NLG or the MLG area. If the vibrations do not stop immediately when you set the landing gear lever to the UP position but gradually decrease, the vibrations possibly come from the NLG area. If the vibrations stop immediately when you set the landing gear lever to the UP position, the vibrations possibly come from the MLG area.
   (1) If the cause of the vibrations is in the NLG area:
     (a) Do the steps that follow only in line maintenance:
       1 On the NLG wheel-axle nuts, remove the locking bolts and make sure that the NLG wheel-axle torque is correct AMM 32-41-12-400-001.
       2 Jack the NLG to lift the NLG wheels off the ground AMM 07-12-00-582-001.
       3 Do a check of the tire installation on the wheel rim (out-of-round).
         a Usually, the tires have a "rim line" that is near the beads on all of the tire circumference. After the tire inflation and when the tire is stable, refer to this rim line to make sure that the tire is correctly installed on the rim.
         b Make sure that the distance between the wheel rim and this line is the same all around the wheel assembly.
       4 Remove the NLG wheels AMM 32-41-12-000-001:
  • Do a check of the condition of the NLG wheel-axle sleeves.
         a If you find deep scratches, replace the axle sleeves AMM 32-41-12-000-002 and AMM 32-41-12-400-002.
         b If the NLG wheel-axle sleeve is correct, send the wheel to the overhaul facility.
       5 Install a new pair of NLG wheels AMM 32-41-12-400-001.
         a If the check of the NLG torque-link assembly is correct:
  • Do a check of the gap at the aft NLG door AMM 32-22-00-220-002.

    *If the check of the gap at the aft NLG door is correct:
    *-Do a visual check of the NLG leg door-assembly attachment to make sure that there is not too much play.
    *-Do a check of the NLG door adjustment AMM 32-22-00-820-001.

       6 If the fault continues, send the aircraft to the hangar for a full procedure.
     (b) Do the steps that follow only in the hangar:
NOTE: If the Line Maintenance staff did no troubleshooting, we recommend that you do "Line Maintenance" and the "Hangar" steps.
       1 Jack the aircraft at the forward jacking point, MLG wheels on the ground AMM 07-11-00-581-003.
  • Do a check of the NLG shock-absorber fluid-level and charge pressure ("Two-Point Check" - Aircraft on jacks to start) AMM 12-12-32-610-001 and replenish or pressurize, as necessary.
       2 Do a check of the tire installation on the wheel rim (out-of-round).
         a Usually, the tires have a "rim line" that is near the beads on all of the tire circumference. After the tire inflation and when the tire is stable, refer to this rim line to make sure that the tire is correctly installed on the rim.
         b Make sure that the distance between the wheel rim and this line is the same all around the wheel assembly.
       3 On the NLG wheel-axle nuts, remove the locking bolts and make sure that the NLG wheel-axle torque is correct AMM 32-41-12-400-001.
       4 Remove the NLG wheels AMM 32-41-12-000-001:
  • Do a check of the condition of the NLG wheel-axle sleeves.
         a If you find deep scratches, replace the axle sleeves AMM 32-41-12-000-002 and AMM 32-41-12-400-002.
         b If the NLG wheel-axle sleeve is correct:
  • Send the wheel to the overhaul facility.
  • Refer to the applicable CMM to do a check of the NLG wheel-bearing condition.

    *If the check of the NLG wheel-bearing condition is correct:
    *-Do a check of the quantity and quality of the NLG wheel-bearing grease in the overhaul facility.

         c Do a check of the NLG wheel and tire assembly balance (refer to ISI 32.41.00002 "NLG Wheel and Tire Assembly Balancing").
       5 Install a new pair of NLG wheels AMM 32-41-12-400-001.
         a If the check of the NLG torque-link assembly is correct:
  • Do an inspection of the clearance of the nose-gear hinge bearings AMM 32-21-00-200-004.

    *If the clearance of the nose-gear hinge bearings is correct:
    *-Do a visual check of the NLG-leg door-assembly attachment to make sure that there is not too much play.
    *- Do a check of the gap at the aft NLG door AMM 32-22-00-220-002.

    **If the check of the gap at the aft NLG door is correct:
    **-Do a check of the NLG door adjustment AMM 32-22-00-820-001.

       6 If the fault continues, do a check of the internal parts of the NLG for damage (or wear) and replace as necessary:
         a NLG shock absorber assembly AMM 32-21-13-000-001 and AMM 32-21-13-400-001.
  • NLG shock-strut backplate
  • NLG lower bearing.
         b Apply Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) , Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) , or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) on all the joints of the NLG AMM 12-22-32-640-002.
   (2) If the cause of the vibrations is in the MLG area:
     (a) Do the steps that follow only in line maintenance:
       1 Jack the MLG to lift the MLG wheels off the ground AMM 07-12-00-582-002.
       2 Do a check of the tire installation on the wheel rim (out-of-round).
         a Usually, the tires have a "rim line" that is near the beads on all of the tire circumference. After the tire inflation and when the tire is stable, refer to this rim line to make sure that the tire is correctly installed on the rim.
         b Make sure that the distance between the wheel rim and this line is the same all around the wheel assembly.
       3 On the MLG wheel-axle nuts, remove the locking bolts and make sure that the MLG wheel-axle torque is correct AMM 32-41-11-400-006.
  • Make sure that the four MLG wheels turn freely.
         a If one wheel does not turn freely:
         b If the wheels turn freely:
  • Do a check of the condition of the MLG wheel-axle sleeves

    *If you find deep scratches, replace the axle sleeves AMM 32-42-71-000-001 and AMM 32-42-71-400-001.

    *If the check of the MLG wheel-axle sleeves is correct:
    *-Do a visual inspection of the MLG torque-link damper-assemblies AMM 32-11-27-210-001.

       4 Make sure that the MLG fixed-fairing assemblies are correctly installed AMM 32-12-14-400-001.
       5 If the fault continues, send the aircraft to the hangar for a full procedure.
     (b) Do the steps that follow only in the hangar:
NOTE: If the Line Maintenance staff did no troubleshooting, we recommend that you do "Line Maintenance" and the "Hangar" steps.
       1 Jack the aircraft for maintenance operations AMM 07-11-00-581-001.
       2 Do a check of the MLG shock-absorber charge-pressure AMM 12-14-32-614-003 and fluid level AMM 12-12-32-611-004.
       3 On the MLG wheel-axle nuts, remove the locking bolts and make sure that the MLG wheel-axle torque is correct AMM 32-41-11-400-006.
  • Make sure that the four MLG wheels turn freely.
         a If one wheel does not turn freely:
         b If the wheels turn freely, remove the MLG wheels AMM 32-41-11-000-006.
  • Do a check of the condition of the MLG wheel-axle sleeves.

    *If you find deep scratches, replace the axle sleeves AMM 32-42-71-000-001 and AMM 32-42-71-400-001.

    *If the MLG wheel-axle sleeves is correct:
    *-Send the wheels to the overhaul facility.
    *-Refer to the applicable CMM to do a check of the MLG wheel-bearing condition.

    **If the check of the MLG wheel-bearings condition is correct:
    **-Do a check of the quantity and quality of the MLG wheel-bearing grease in the overhaul facility.

       4 Install the MLG wheels AMM 32-41-11-400-006.
         a If the MLG torque-link inspection is correct:
  • Do a detailed inspection of the MLG torque-link damper-assemblies AMM 32-11-27-210-001.
  • Do a check of the fluid level in the MLG torque-link damper AMM 32-11-11-200-001.

    *If the fluid level in the MLG torque-link damper is correct:
    *-Do a check of the MLG fixed-fairing assemblies installation AMM 32-12-14-400-001.

    **If the MLG fixed-fairing assemblies are correctly installed:
    **-Disconnect the side-stay from the lower attachment lug(s) of the MLG side-stay and remove the lower cardan joint AMM 32-11-18-000-001.
    **-Do an inspection of the lower attachment lug(s) of the MLG side-stay AMM 32-11-00-220-004.

    ***If the inspection of the lower attachment lug(s) of the MLG side-stay is correct:
    ***-Do a check of the torque values of the upper cardan joints AMM 32-11-16-400-001.

    ****If the torque values of the upper cardan joints are correct:
    ****-Do a visual inspection of the MLG/airframe interface attachments.
    ****-Apply Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) , Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) on all the joints on the MLG AMM 12-22-32-640-001.
Subtask 32-20-00-810-057-A
C. Identification of the Vibrations and Product Improvement
F Nose Wheel Vibration Reporting Sheet
   (1) Fill in the Nose Wheel Reporting Sheets for Flight Crew and Maintenance Crew.
   (2) Send the data to AIRBUS.
Subtask 32-20-00-700-053-A
D. After the subsequent flight, make sure that the fault does not continue.
[Rev.8 from Aug 2018] 2026.04.04 04:31:19 UTC
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