Noise from the Nose Wheel Steering

TASK 32-51-00-810-847-A
Noise from the Nose Wheel Steering

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM 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)
TSM TASK 32-20-00-810-801-A-01	Grinding Noise from the NLG during Taxiing or Towing (Trouble Shooting procedure Weight on Wheels)
AMM 32-42-34-000-001	Removal of the Braking/Steering Control Unit (BSCU)
AMM 32-42-34-400-001	Installation of the Braking/Steering Control Unit (BSCU)
AMM 32-51-51-000-001	Removal of the Nose-Wheel Steering Servo-Control
AMM 32-51-51-000-002	Removal of the Nose Wheel Steering Servo-Valve
AMM 32-51-51-400-001	Installation of the Nose-Wheel Steering Servo-Control
AMM 32-51-51-400-002	Installation of the Nose Wheel Steering Servo-Valve

3. Fault Confirmation
Subtask 32-51-00-720-061-A

A. Not Applicable

4. Fault Isolation
Subtask 32-51-00-810-115-A

A. If there is noise and vibrations from the nose wheel steering:

Do a check of integrity of the screws that attach the SERVO CTL-N/W STEERING [6GC] to the NLG leg, and the screws that attach the nose-wheel servo-valve to the nose-wheel steering servo-control SERVO CTL-N/W STEERING [6GC] .
If the screws are damaged, replace the screws AMM 32-51-51-000-001 and AMM 32-51-51-400-001.

(1) If the fault continues:

Replace the nose-wheel steering servo-valve AMM 32-51-51-000-002 and AMM 32-51-51-400-002.

NOTE: It is recommended to install the last servo valve P/N A68982-004 (SN > 1340) to decrease noise and vibrations.

(2) If the fault continues and if the BSCU [10GG] P/N E21327XXX or E21327XXX Amdt A or Amdt B is installed:

Remove the BSCU [10GG] and install the BSCU (10GG) P/N E21327XXX Amdt C or subsequent AMM 32-42-34-000-001 and AMM 32-42-34-400-001.

NOTE: It is recommended to install a BSCU [10GG] P/N E21327XXX Amdt C or subsequent to decrease noise and vibrations.

(3) If the fault continues:

Replace the SERVO CTL-N/W STEERING [6GC] AMM 32-51-51-000-001 and AMM 32-51-51-400-001.

(4) If the fault continues:

[Rev.8 from Aug 2018] 2026.04.04 04:31:51 UTC