DOC AIRBUS | AMM A320FInstallation of the NLG Door Ground Opening Bypass Valve
TASK 32-31-15-400-001-A
Installation of the NLG Door Ground Opening Bypass Valve
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 32-31-15-860-051-A
Subtask 32-31-15-110-050-A
Subtask 32-31-15-410-050-A
[Rev.10 from 2021]
2026.04.01 00:44:29 UTC
Installation of the NLG Door Ground Opening Bypass Valve
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf 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 | PLUG - BLANKING |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 0.35 and 0.3 m.daN (30.97 and 26.55 lbf.in )  | |
| No specific | Torque wrench: range to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in ) | |
| No specific | Torque wrench: range to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ) | |
| No specific | Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ) | |
| No specific | Torque wrench: range to between 1.75 and 1.63 m.daN (12.91 and 12.02 lbf.ft ) | |
| 98A32301013000 | 1 | RIGGING PIN |
| 98D32203502000 | 1 | SAFETY PIN - NLG DOOR |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03GBB1) | Synthetic Oil base Grease-General Purpose Clay Thickened - |
| (Material No.03GBC1) | Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - |
| No specific | lockwire corrosion resistant steel dia. 0.8 mm (0.03 in) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 124 | NOSE GEAR WELL |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 27 | COTTER PIN | AIPC 32-31-01-09-010 |
| 5 | COTTER PIN | AIPC 32-31-01-10-010 |
| 18 | COTTER PIN | AIPC 32-31-01-10-030 |
| 13 | PACKING | AIPC 32-31-01-10-110 |
| 3 | PACKING | AIPC 32-31-01-10-110 |
| 8 | PACKING | AIPC 32-31-01-10-110 |
| 27 | COTTER PIN | AIPC 32-31-81-09-010 |
| 5 | COTTER PIN | AIPC 32-31-81-10-010 |
| 18 | COTTER PIN | AIPC 32-31-81-10-050 |
| 13 | PACKING | AIPC 32-31-81-10-110 |
| 3 | PACKING | AIPC 32-31-81-10-110 |
| 8 | PACKING | AIPC 32-31-81-10-110 |
| 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 29-10-00-863-001-A | Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart |
| TASK 29-10-00-864-001-A | Depressurize the Green Hydraulic System |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| TASK 29-14-00-614-002-A | Pressurization of the Hydraulic Reservoirs through the Ground Connector |
| TASK 29-14-00-614-002-A-01 | Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU) |
| TASK 29-23-00-863-001-A | Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump |
| TASK 29-23-00-864-001-A | Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU |
| 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 32-31-00-710-002-A | Operational Test of the Landing Gear Doors (With False Targets) |
| TASK 32-31-00-710-002-A-01 | Operational Test of the Landing Gear Doors (Without False Targets) |
NLG Door Ground Opening Bypass ValveSubtask 32-31-15-860-051-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 CONTAINER 5 L (1.32 USGAL) is in position below the NLG door ground opening bypass valve (2533GM).
(7) Make sure that the doors of the nose landing gear are open (Ref. AMM TASK 32-22-00-010-001).
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 CONTAINER 5 L (1.32 USGAL) is in position below the NLG door ground opening bypass valve (2533GM).
(7) Make sure that the doors of the nose landing gear are open (Ref. AMM TASK 32-22-00-010-001).
Subtask 32-31-15-110-050-A
A. Preparation for Installation
(1) Clean the mating surfaces and the junction components with ACETONE (Material No. 11-583). Dry them with dry, filtered compressed air.
(2) Apply a thin layer of Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) to the nuts and bolts, specially the bolt (21).
Subtask 32-31-15-420-051-A (1) Clean the mating surfaces and the junction components with ACETONE (Material No. 11-583). Dry them with dry, filtered compressed air.
(2) Apply a thin layer of Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) to the nuts and bolts, specially the bolt (21).
B. Installation of the NLG Door Ground Opening Bypass Valve
(2) Install the bolts (14), the washers (6) and the nuts (4).
(3) TORQUE the nuts (4) to between 0.35 and 0.3 m.daN (30.97 and 26.55 lbf.in ) and safety them with the new AIPC 32-31-01-10-010 COTTER PIN (5) or AIPC 32-31-81-10-010 COTTER PIN (5).
(4) Install the reducers (2) and (12) with the new AIPC 32-31-01-10-110 PACKING (3) or AIPC 32-31-81-10-110 PACKING (3) and the new AIPC 32-31-01-10-110 PACKING (13) or AIPC 32-31-81-10-110 PACKING (13).
(5) TORQUE the reducers (2) and (12) to between 1.75 and 1.63 m.daN (12.91 and 12.02 lbf.ft ).
(6) Install the restrictor (9) with the new AIPC 32-31-01-10-110 PACKING (8) or AIPC 32-31-81-10-110 PACKING (8).
(7) TORQUE the restrictor (9) to between 1.75 and 1.63 m.daN (12.91 and 12.02 lbf.ft ).
(8) Remove the PLUG - BLANKING and connect the hydraulic lines (1), (10) and (11).
(9) TORQUE the hydraulic lines (1), (10) and (11) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ).
(10) Install the lever (23), the screw (24), the washer (20) and the nut (19). TORQUE the nut (19) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ) and safety it with the new AIPC 32-31-01-10-030 COTTER PIN (18) or AIPC 32-31-81-10-050 COTTER PIN (18).
Subtask 32-31-15-420-052-A WARNING:
MAKE SURE THAT THE NLG DOWNLOCK SAFETY PIN AND THE TWO DOOR SAFETY PINS ARE INSTALLED.
(1) Put the selector valve (7) in position. (2) Install the bolts (14), the washers (6) and the nuts (4).
(3) TORQUE the nuts (4) to between 0.35 and 0.3 m.daN (30.97 and 26.55 lbf.in )
and safety them with the new AIPC 32-31-01-10-010 COTTER PIN (5) or AIPC 32-31-81-10-010 COTTER PIN (5). (4) Install the reducers (2) and (12) with the new AIPC 32-31-01-10-110 PACKING (3) or AIPC 32-31-81-10-110 PACKING (3) and the new AIPC 32-31-01-10-110 PACKING (13) or AIPC 32-31-81-10-110 PACKING (13).
(5) TORQUE the reducers (2) and (12) to between 1.75 and 1.63 m.daN (12.91 and 12.02 lbf.ft )
. (6) Install the restrictor (9) with the new AIPC 32-31-01-10-110 PACKING (8) or AIPC 32-31-81-10-110 PACKING (8).
(7) TORQUE the restrictor (9) to between 1.75 and 1.63 m.daN (12.91 and 12.02 lbf.ft )
. (8) Remove the PLUG - BLANKING and connect the hydraulic lines (1), (10) and (11).
(9) TORQUE the hydraulic lines (1), (10) and (11) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
. (10) Install the lever (23), the screw (24), the washer (20) and the nut (19). TORQUE the nut (19) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in )
and safety it with the new AIPC 32-31-01-10-030 COTTER PIN (18) or AIPC 32-31-81-10-050 COTTER PIN (18). C. Connection of the Rod
(2) Make sure that the reservoir of the Green hydraulic system is depressurized
(Ref. AMM TASK 29-14-00-614-001).
(3) Do a check of the position of the bypass valve.
(a) If the valve is in the by-pass position:
1 Put the rod (17) in position and install the bolt (22).
2 Install the washer (25) and nut (26).
3 TORQUE the nut (26) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ).
4 Safety the nut (26) with the new AIPC 32-31-01-09-010 COTTER PIN (27) or AIPC 32-31-81-09-010 COTTER PIN (27).
5 Remove the 98D32203502000 SAFETY PIN - NLG DOOR.
6 Make sure that the work area is clean and clear of tool(s) and other items, then go to a safe area.
7 Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
8 Pressurize the reservoirs of the hydraulic systems.
(Ref. AMM TASK 29-14-00-614-002).
9 Close the NLG doors with the ground door-opening handle (Ref. AMM TASK 32-22-00-410-001).
10 Open the NLG doors with the ground door-opening handle (Ref. AMM TASK 32-22-00-010-001).
11 Depressurize the Green hydraulic system
(Ref. AMM TASK 29-00-00-864-001).
12 Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).
13 Install the 98D32203502000 SAFETY PIN - NLG DOOR.
14 Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
15 Pressurize the reservoirs of the hydraulic systems.
(Ref. AMM TASK 29-14-00-614-002).
16 Put the ground door-opening handle in the closed position and put the safety pin in position.
17 Depressurize the Green hydraulic system
(Ref. AMM TASK 29-00-00-864-001).
18 Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).
19 Install the RIGGING PIN (21) on the selector valve (7).
21 Loosen the nuts (15) and release the washers (16).
22 Adjust the length of the rod (17).
23 TORQUE the nuts (15) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in ).
24 Safety the nuts (15) with lockwire corrosion resistant steel dia. 0.8 mm (0.03 in).
25 Remove the 98A32301013000 RIGGING PIN (21).
26 Go to Para D. Preparation for the test.
(b) If the valve is in the normal position:
1 Install the 98D32203502000 SAFETY PIN - NLG DOOR.
2 Put the ground door-opening control handle in the closed position and put the safety pin in position.
3 Install the 98A32301013000 RIGGING PIN (21) on the selector valve (7).
5 Loosen the nuts (15) and release the washers (16).
6 Install the bolt (22). To do this, adjust the length of the rod (17).
7 TORQUE the nuts (15) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in ).
8 Safety the nuts (15) with lockwire corrosion resistant steel dia. 0.8 mm (0.03 in).
9 Put the rod (17) in position and install the bolt (22).
10 Install the washer (25) and nut (26).
11 TORQUE the nut (26) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ).
12 Safety the nut (26) with the new AIPC 32-31-01-09-010 COTTER PIN (27) or AIPC 32-31-81-09-010 COTTER PIN (27).
13 Remove the 98A32301013000 RIGGING PIN (21).
14 Go to Para D. Preparation for the test.
Subtask 32-31-15-941-052-A WARNING:
MAKE SURE THAT THE NLG DOWNLOCK SAFETY PIN AND THE TWO DOOR SAFETY PINS ARE INSTALLED.
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.
(1) Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration (Ref. AMM TASK 29-23-00-864-001) or (Ref. AMM TASK 29-10-00-864-001). (2) Make sure that the reservoir of the Green hydraulic system is depressurized
(Ref. AMM TASK 29-14-00-614-001).
(3) Do a check of the position of the bypass valve.
(a) If the valve is in the by-pass position:
1 Put the rod (17) in position and install the bolt (22).
2 Install the washer (25) and nut (26).
3 TORQUE the nut (26) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in )
. 4 Safety the nut (26) with the new AIPC 32-31-01-09-010 COTTER PIN (27) or AIPC 32-31-81-09-010 COTTER PIN (27).
5 Remove the 98D32203502000 SAFETY PIN - NLG DOOR.
6 Make sure that the work area is clean and clear of tool(s) and other items, then go to a safe area.
7 Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
8 Pressurize the reservoirs of the hydraulic systems.
(Ref. AMM TASK 29-14-00-614-002).
9 Close the NLG doors with the ground door-opening handle (Ref. AMM TASK 32-22-00-410-001).
10 Open the NLG doors with the ground door-opening handle (Ref. AMM TASK 32-22-00-010-001).
11 Depressurize the Green hydraulic system
(Ref. AMM TASK 29-00-00-864-001).
12 Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).
13 Install the 98D32203502000 SAFETY PIN - NLG DOOR.
14 Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
15 Pressurize the reservoirs of the hydraulic systems.
(Ref. AMM TASK 29-14-00-614-002).
16 Put the ground door-opening handle in the closed position and put the safety pin in position.
17 Depressurize the Green hydraulic system
(Ref. AMM TASK 29-00-00-864-001).
18 Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001).
19 Install the RIGGING PIN (21) on the selector valve (7).
NOTE: You can only move the selector valve (7) from the DOORS OPEN position to the DOORS CLOSED position if the Green hydraulic system is pressurized (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
20 Cut and remove the lockwire from the rod (17). 21 Loosen the nuts (15) and release the washers (16).
22 Adjust the length of the rod (17).
23 TORQUE the nuts (15) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in )
. 24 Safety the nuts (15) with lockwire corrosion resistant steel dia. 0.8 mm (0.03 in).
25 Remove the 98A32301013000 RIGGING PIN (21).
26 Go to Para D. Preparation for the test.
(b) If the valve is in the normal position:
1 Install the 98D32203502000 SAFETY PIN - NLG DOOR.
2 Put the ground door-opening control handle in the closed position and put the safety pin in position.
3 Install the 98A32301013000 RIGGING PIN (21) on the selector valve (7).
NOTE: You can only move the selector valve (7) from the DOORS OPEN position to the DOORS CLOSED position if the Green hydraulic system is pressurized (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001)
4 Cut and remove the lockwire from the rod (17). 5 Loosen the nuts (15) and release the washers (16).
6 Install the bolt (22). To do this, adjust the length of the rod (17).
7 TORQUE the nuts (15) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in )
. 8 Safety the nuts (15) with lockwire corrosion resistant steel dia. 0.8 mm (0.03 in).
9 Put the rod (17) in position and install the bolt (22).
10 Install the washer (25) and nut (26).
11 TORQUE the nut (26) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in )
. 12 Safety the nut (26) with the new AIPC 32-31-01-09-010 COTTER PIN (27) or AIPC 32-31-81-09-010 COTTER PIN (27).
13 Remove the 98A32301013000 RIGGING PIN (21).
14 Go to Para D. Preparation for the test.
D. Preparation for the Test
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety pin from the door ground-opening handle.
(3) Put the door ground-opening handle in the OPEN position.
(4) Install the safety pin on the handle.
(5) Remove the container below the NLG door ground opening bypass valve (2533GM).
(6) Remove the 98D32203502000 SAFETY PIN - NLG DOOR.
(7) Make sure that the travel ranges of the NLG doors are clear.
(8) Remove the access platform(s).
Subtask 32-31-15-710-050-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety pin from the door ground-opening handle.
(3) Put the door ground-opening handle in the OPEN position.
(4) Install the safety pin on the handle.
(5) Remove the container below the NLG door ground opening bypass valve (2533GM).
(6) Remove the 98D32203502000 SAFETY PIN - NLG DOOR.
(7) Make sure that the travel ranges of the NLG doors are clear.
(8) Remove the access platform(s).
E. Operational Test
(1) Do an operational test of the applicable NLG door (Ref. AMM TASK 32-31-00-710-002).
Subtask 32-31-15-720-050-A (1) Do an operational test of the applicable NLG door (Ref. AMM TASK 32-31-00-710-002).
NOTE: The operational test is only for the NLG doors opening bypass-valve that you installed or on which you did maintenance. The operational test on all the doors is optional.
F. Functional Test
(1) Do 5 full DOOR CLOSE/DOOR OPEN cycles (Ref. AMM TASK 32-22-00-410-001) (Ref. AMM TASK 32-22-00-010-001).
(2) Make sure that there are no anomalies during these operations.
(3) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(4) Put the access platform in position below the NLG door ground opening bypass valve (2533GM).
(5) Make sure that there are no leaks from the disconnected line ends.
(6) 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 5 full DOOR CLOSE/DOOR OPEN cycles (Ref. AMM TASK 32-22-00-410-001) (Ref. AMM TASK 32-22-00-010-001).
(2) Make sure that there are no anomalies during these operations.
(3) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(4) Put the access platform in position below the NLG door ground opening bypass valve (2533GM).
(5) Make sure that there are no leaks from the disconnected line ends.
(6) 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 32-31-15-410-050-A
A. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).