Grinding Noise from the NLG during Taxiing or Towing (Trouble Shooting procedure with the lifting of the A/C at forward point)

TASK 32-20-00-810-801-A
Grinding Noise from the NLG during Taxiing or Towing (Trouble Shooting procedure with the lifting of the A/C at forward point)

1. Possible Causes

nose wheel steering cylinder
shock absorber
LEG ASSY-NLG [2526GM]

2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02BBB9)	Mineral Hydraulic Fluid-Damper - -

B. Referenced Information

REFERENCE	DESIGNATION
AMM 07-11-00-581-003	Lifting of the Aircraft at the Forward Jacking Point, MLG Wheels on the Ground
AMM 07-11-00-586-001	Lowering of the Aircraft at Forward Jacking Point, MLG Wheels on the Ground
AMM 12-22-32-640-002	Lubrication of Nose Landing Gear and Doors
AMM 32-21-00-200-003	Check of NLG Torque Links for Excessive Play
AMM 32-21-00-200-004	Inspection/Check of the Clearance of the Nose-Gear Hinge Bearings
AMM 32-21-11-000-002
AMM 32-21-11-400-002
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 32-51-42-000-001	Removal of the Nose-Wheel Steering Cylinder
AMM 32-51-42-400-001	Installation of the Nose-Wheel Steering Cylinder
Location of the Fluid Injection Method (Absorber Assy - NLG Shock)

3. Fault Confirmation
Subtask 32-20-00-700-050-A

A. Not applicable.

4. Fault Isolation
Subtask 32-20-00-810-050-A

A. If there is a grinding noise from the NLG during taxiing or towing

NOTE: The noises do not endanger safety.If the aircraft ground time or lack of equipment does not permit lubrication of the inner part of the nose gear shock strut, carry out the lubrication at the next convenient opportunity.

do the lifting of the aircraft at forward jacking point, MLG wheels on the ground AMM 07-11-00-581-003.

NOTE: Lift the aircraft until the NLG wheel tires are 100 mm (4 in.) off the ground.

put a hydraulic jack under the NLG shock absorber
add half a liter of hydraulic fluid Mineral Hydraulic Fluid-Damper - - (Material No.02BBB9) through the upper orifice at the rear of the leg on the internal wall of the barrel with a syringe so that the fluid runs down to the Airflon coated ring
Location of the Fluid Injection Method (Absorber Assy - NLG Shock)
move the NLG shock absorber upwards by 70 mm min. (2.8 in.) with the jack to disengage the cams. Do this operation two times
manually operate the nose wheels
(rotation of the shock absorber plus or minus 45 degrees)
hold the leg in this position for one hour
do the lowering of the aircraft at forward jacking point, MLG wheels on the ground AMM 07-11-00-586-001.

(1) If the fault continues:

do the lubrication of the NLG AMM 12-22-32-640-002.

(2) If the fault continues:

do the inspection/check of the torque link assembly of the nose landing gear AMM 32-21-00-200-003.

(3) If the fault continues:

do the inspection/check of the clearance of the nose gear hinge bearings AMM 32-21-00-200-004.

(4) If the fault continues:

replace the nose wheel steering cylinder AMM 32-51-42-000-001 and AMM 32-51-42-400-001.

(5) If the fault continues:

replace the shock absorber AMM 32-21-13-000-001 and AMM 32-21-13-400-001.

(6) If the fault continues:

replace the LEG ASSY-NLG [2526GM] AMM 32-21-11-000-002 and AMM 32-21-11-400-002.

[Rev.8 from Aug 2018] 2026.04.04 04:31:18 UTC