DOC AIRBUS | AMM A320FInstallation of the NLG Extension Restrictor Valve
TASK 32-31-56-400-001-A
Installation of the NLG Extension Restrictor Valve
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 32-31-56-860-051-A
Subtask 32-31-56-420-050-A
Subtask 32-31-56-410-050-A
[Rev.10 from 2021]
2026.04.01 00:45:45 UTC
Installation of the NLG Extension Restrictor 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
B. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 124 | NOSE GEAR WELL |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-12-29-611-001-A | Fill the Hydraulic Fluid Reservoir with a Hand Pump |
| TASK 12-12-29-611-002-A | Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart |
| 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 32-22-00-010-001-A | Nose Gear Doors - Ground Doors Opening |
| TASK 32-22-00-410-001-A | Nose Gear Doors - Ground Doors Closing |
| TASK 32-31-00-720-003-A | Functional Test of the Normal Extension and Retraction of the Nose Landing Gear |
NLG Extension Restrictor ValveSubtask 32-31-56-860-051-A
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) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Green hydraulic system:
(6) Make sure that the doors of the nose landing gear are open (Ref. AMM TASK 32-22-00-010-001).
(7) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position in zone 123.
(8) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the restrictor valve (2691GM) to collect the hydraulic fluid leakage.
4. Procedure(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) 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 doors of the nose landing gear are open (Ref. AMM TASK 32-22-00-010-001).
(7) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position in zone 123.
(8) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the restrictor valve (2691GM) to collect the hydraulic fluid leakage.
Subtask 32-31-56-420-050-A
A. Installation of the NLG Extension Restrictor Valve
(1) Remove the blanking plug and connect the valve (2) to the union (1).
(2) TORQUE the valve (2) (inlet connection) to between 2.96 and 2.69 m.daN (21.83 and 19.84 lbf.ft )
.
(3) Remove the blanking plug and connect the union (3) to the valve (2).
(4) TORQUE the union (3) (outlet connection) to between 6.16 and 5.59 m.daN (45.43 and 41.22 lbf.ft ).
Subtask 32-31-56-942-050-A (1) Remove the blanking plug and connect the valve (2) to the union (1).
(2) TORQUE the valve (2) (inlet connection) to between 2.96 and 2.69 m.daN (21.83 and 19.84 lbf.ft )
. (3) Remove the blanking plug and connect the union (3) to the valve (2).
(4) TORQUE the union (3) (outlet connection) to between 6.16 and 5.59 m.daN (45.43 and 41.22 lbf.ft )
. B. Preparation for the Test
(1) Remove the container.
(2) Remove the access platform(s).
(3) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
Subtask 32-31-56-720-050-A (1) Remove the container.
(2) Remove the access platform(s).
(3) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
C. Functional Test
(1) Do a functional test of the retraction/extension of the nose landing gear. (Ref. AMM TASK 32-31-00-720-003)
(2) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(3) Make sure that there is no hydraulic fluid leakage from the restrictor valve (2691GM).
(4) If necessary fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
5. Close-up(1) Do a functional test of the retraction/extension of the nose landing gear. (Ref. AMM TASK 32-31-00-720-003)
(2) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(3) Make sure that there is no hydraulic fluid leakage from the restrictor valve (2691GM).
(4) If necessary fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
Subtask 32-31-56-410-050-A
A. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).
(1) Remove the WARNING NOTICE(S).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).