Installation of the Nose Wheel Steering Servo-Valve

TASK 32-51-51-400-002-A
Installation of the Nose Wheel Steering Servo-Valve

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 5 and 4 m.N (44.25 and 35.40 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06ABA1)	Polysulfide Sealant-Fuel Tank Brushable -
(Material No.06LDG2)	Non Hardening Jointing Putty-High Temp. Area - Structure
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14QFC1)	Wire-Locking Dia: 0.8 mm CRES -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	HEAT SHRINK SLEEVE	AIPC 32-21-43-03-140
9	HEAT SHRINK SLEEVE	AIPC 32-21-43-42-010
10	IDENTIFICATION BAND	AIPC 32-21-43-42-040
6	PACKINGS	AIPC 32-51-51-05-040
12	PACKING	AIPC 32-51-51-05-051

D. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 32-51-00-720-003-A	Functional Test of the Nose Wheel Steering with the Handwheel
TASK 32-51-00-720-004-A	Functional Test of the Nose Wheel Steering with the Pedals
Nose Wheel Steering Servo-Valve

3. Job Set-up
Subtask 32-51-51-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001)
(2) Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) In the cockpit, on the panel 400VU, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate the landing gear control lever.
(4) On the steering handwheels (CAPT and F/O) and on the brake pedals, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate them.
(5) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Green hydraulic system:

on the panel 40VU in the cockpit,
on the ground service panel of the Green hydraulic system, access door (197CB).

(6) Make sure that the SAFETY BARRIER(S) are in position.
(7) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the servo-control.

Subtask 32-51-51-860-055-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001)
(2) Make sure that the reservoir of the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) In the cockpit, on the panel 400VU, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate the landing gear control lever.
(4) On the steering handwheels (CAPT and F/O) and on the brake pedals, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate them.
(5) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Yellow hydraulic system:

on the panel 40VU in the cockpit,
on the ground service panel of the Yellow hydraulic system, access door (196BB).

(6) Make sure that the SAFETY BARRIER(S) are in position.
(7) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the servo-control.

Subtask 32-51-51-865-054-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

4. Procedure
Subtask 32-51-51-110-051-A

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Clean the attachment hardware with Non Aqueous Cleaner-General - - (Material No.08BAA9) and dry with filtered compressed air.
(3) Apply a light coat of Non Hardening Jointing Putty-High Temp. Area - Structure (Material No.06LDG2) to the threads of all the screws.

Subtask 32-51-51-420-053-B

B. Installation of the Servo-Valve
(1) Remove blanking caps from the electrical connectors (7).
(2) Make sure that the electrical connectors (7) are in correct condition.
(a) On the Nose Wheel Steering (NW/S) (6GC) (11), make sure that the electrical connectors are clean and dry.
(3) Install the new AIPC 32-51-51-05-040 PACKINGS (6) and the new AIPC 32-51-51-05-051 PACKING (12) on the servo-valve (2).
(4) Put the servo-valve (2) in position with the screws (1).
(5) Push the servo-valve (2) to connect the electrical connectors (7).
(6) TORQUE the screws (1) to between 5 and 4 m.N (44.25 and 35.40 lbf.in )

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(7) Safety the screws (1) with 14QFC1Wire-Locking Dia: 0.8 mm CRES -.
(8) Make sure that the heat shrink sleeve (9) is not damaged.
(a) If the heat shrink sleeve (9) is damaged, do the steps that follow:
1 Remove and discard the heat shrink sleeve (9) and the identification band (10).
2 Install the new AIPC 32-21-43-42-010 HEAT SHRINK SLEEVE (9) or AIPC 32-21-43-03-140 HEAT SHRINK SLEEVE (9).
3 Connect the electrical connector (8) to the NW/S servo control (6GC) (11).
4 Apply heat to shrink the top part of the heat shrink sleeve (9). Make sure that you do not cause damage to the cover of the 6GCA connector.
5 Install the new AIPC 32-21-43-42-040 IDENTIFICATION BAND (10).
(b) If the heat shrink sleeve (9) is not damaged:
1 Connect the electrical connector (8) to the NW/S servo control (6GC).
2 Fold the end of the heat shrink sleeve (9) back on the connector (8) to fully protect it.
(9) Apply Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) on:

The heads of the screws (1).
The joint-line between the servo-valve (2) and the NW/S servo control (6GC) (11).

Subtask 32-51-51-865-055-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

Subtask 32-51-51-720-051-A

D. Functional Test
(1) Do the functional test of the nose wheel steering. (Ref. AMM TASK 32-51-00-720-003) or (Ref. AMM TASK 32-51-00-720-004).

5. Close-up
Subtask 32-51-51-860-056-A

A. Put the aircraft back to its initial configuration.
(1) Remove the container.
(2) Remove the safety barriers.
(3) Remove the WARNING NOTICE(S).
(4) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 00:51:55 UTC