DOC AIRBUS | AMM A320FRemoval of the Nose Wheel Steering Servo-Valve
TASK 32-51-51-000-002-A
Removal of the Nose Wheel Steering Servo-Valve
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 32-51-51-860-051-A ** ON A/C NOT FOR ALL
Subtask 32-51-51-020-053-B
[Rev.10 from 2021]
2026.04.01 00:51:54 UTC
Removal 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.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | CAP - BLANKING |
| No specific | AR | CONTAINER 5 L (1.32 USGAL) |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | 1 | SPATULA - NON METALLIC |
| No specific | AR | WARNING NOTICE(S) |
| 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 |
Nose Wheel Steering Servo-ValveSubtask 32-51-51-860-051-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) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001)
Subtask 32-51-51-941-052-A ** ON A/C NOT FOR ALL (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) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001)
B. Safety Precautions
(1) In the cockpit, on the panel 400VU put WARNING NOTICE(S) in position to tell persons not to operate the landing gear control lever.
(2) On the steering handwheels (CAPT and F/O) and on the brake pedals, put WARNING NOTICE(S) in position to tell persons not to operate them.
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:
(5) Put a CONTAINER 5 L (1.32 USGAL) below the servo-control to drain the hydraulic fluid.
Subtask 32-51-51-860-051-B ** ON A/C NOT FOR ALL (1) In the cockpit, on the panel 400VU put WARNING NOTICE(S) in position to tell persons not to operate the landing gear control lever.
(2) On the steering handwheels (CAPT and F/O) and on the brake pedals, put WARNING NOTICE(S) in position to tell persons not to operate them.
(3) Put the WARNING NOTICE(S) 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).
(5) Put a CONTAINER 5 L (1.32 USGAL) below the servo-control to drain the hydraulic fluid.
C. 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) Depressurize the reservoir of the Yellow hydraulic system.
(Ref. AMM TASK 29-14-00-614-001)
Subtask 32-51-51-941-052-B ** ON A/C NOT FOR ALL (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) Depressurize the reservoir of the Yellow hydraulic system.
(Ref. AMM TASK 29-14-00-614-001)
D. Safety Precautions
(1) In the cockpit, on the panel 400VU put WARNING NOTICE(S) in position to tell persons not to operate the landing gear control lever.
(2) On the steering handwheels (CAPT and F/O) and on the brake pedals, put WARNING NOTICE(S) in position to tell persons not to operate them.
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:
(5) Put a CONTAINER 5 L (1.32 USGAL) below the servo-control to drain the hydraulic fluid.
Subtask 32-51-51-865-053-A (1) In the cockpit, on the panel 400VU put WARNING NOTICE(S) in position to tell persons not to operate the landing gear control lever.
(2) On the steering handwheels (CAPT and F/O) and on the brake pedals, put WARNING NOTICE(S) in position to tell persons not to operate them.
(3) Put the WARNING NOTICE(S) 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).
(5) Put a CONTAINER 5 L (1.32 USGAL) below the servo-control to drain the hydraulic fluid.
E. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| 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 32-51-51-020-053-B
A. Removal of the Servo-Valve
(1) Use a SPATULA - NON METALLIC to remove the sealant from:
(3) Connect a hose to the valve (4).
(4) Slowly loosen the nut (3) to open the valve (4) and drain the hydraulic fluid.
(5) When no more fluid flows out, remove the hose and tighten the nut (3) to close the valve (4).
(6) Lift the sleeve (9)
(7) Disconnect the electrical connector (8).
(8) Put the CAP - BLANKING on the disconnected electrical connector (8).
(10) Remove the screws (1).
(11) Remove the servo-valve (2).
(12) Remove and discard the packings (6) and (12).
(13) Clean and dry the electrical connectors of the servo-valve (2).
(1) Use a SPATULA - NON METALLIC to remove the sealant from:
- The heads of the screws (1)
- The joint-line between the servo-valve (2) and the Nose Wheel Steering (NW/S) servo-control (6GC) (11).
(3) Connect a hose to the valve (4).
(4) Slowly loosen the nut (3) to open the valve (4) and drain the hydraulic fluid.
(5) When no more fluid flows out, remove the hose and tighten the nut (3) to close the valve (4).
(6) Lift the sleeve (9)
(7) Disconnect the electrical connector (8).
(8) Put the CAP - BLANKING on the disconnected electrical connector (8).
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.
(9) Cut, remove and discard the lockwire from the screws (1). (10) Remove the screws (1).
(11) Remove the servo-valve (2).
(12) Remove and discard the packings (6) and (12).
(13) Clean and dry the electrical connectors of the servo-valve (2).
NOTE: When you remove the servo-valve (2) from the NW/S servo control (6GC) (11):
(14) Put the CAP - BLANKING on the electrical connectors (7). - The hydraulic fluid in the body of the NW/S servo control (6GC) (11) will flow out and can get on the electrical connectors of the servo-valve (2).