Failure of the Steering Selector Valve 7GC (Closed Position)

TASK 32-51-00-810-838-A
Failure of the Steering Selector Valve 7GC (Closed Position)

1. Possible Causes

SAFETY VALVE [2900GM]
SEL VALVE/MANIFOLD ASSY [7GC]
SERVO CTL-N/W STEERING [6GC]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-46-00-740-002	BITE Test of the BSCU - Ground Scanning
AMM 32-51-00-720-004	Functional Test of the Nose Wheel Steering with the Pedals
AMM 32-51-21-000-001	Removal of the Safety Valve
AMM 32-51-21-400-001	Installation of the Safety Valve
AMM 32-51-23-000-001	Removal of the Selector Valve and Manifold-Assembly
AMM 32-51-23-400-001	Installation of the Selector Valve and Manifold-Assembly
AMM 32-51-51-000-001	Removal of the Nose-Wheel Steering Servo-Control
AMM 32-51-51-400-001	Installation of the Nose-Wheel Steering Servo-Control

3. Fault Confirmation
Subtask 32-51-00-720-057-A ** ON A/C NOT FOR ALL

A. Tests
(1) Do the functional test of the nose wheels steering with the pedals AMM 32-51-00-720-004.
(2) Do the GROUND SCANNING of the BSCU AMM 32-46-00-740-002.

4. Fault Isolation
Subtask 32-51-00-810-101-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message STRG SEL VALVE(7GC)/STRG ELECTRO - HYD MODULE (6GC):

replace the SAFETY VALVE [2900GM] AMM 32-51-21-000-001 and AMM 32-51-21-400-001.

(1) If the fault continues:

replace the SEL VALVE/MANIFOLD ASSY [7GC] AMM 32-51-23-000-001 and AMM 32-51-23-400-001.

(2) 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.

Subtask 32-51-00-720-058-A ** ON A/C NOT FOR ALL

B. Do the test given in Para.3.A.

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