DOC AIRBUS | AMM A320FInstallation of the NLG Door Uplock Assy
TASK 32-31-14-400-001-A
Installation of the NLG Door Uplock Assy
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Expendable Parts
D. Referenced Information
3. Job Set-up
Subtask 32-31-14-860-052-A
Subtask 32-31-14-110-050-A
Subtask 32-31-14-410-051-A
[Rev.10 from 2021]
2026.04.01 12:31:03 UTC
Installation of the NLG Door Uplock Assy
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 | ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE |
| 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 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 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft ) | |
| No specific | Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ) | |
| 98A27901002000 | 1 | PIN-RIGGING,RUDDER CONTROL |
| 98A32301000000 | 1 | RIGGING PIN |
| 98D32203502000 | 2 | SAFETY PIN - NLG DOOR |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03GBB1) | Synthetic Oil base Grease-General Purpose Clay Thickened - |
| (Material No.03HBD9) | Synthetic Ester base Grease-General Purpose Low Temp - |
| (Material No.06AAA1) | Polysulfide Sealant_General Purpose Brushable - |
| (Material No.08BBB1) | Non Aqueous Cleaner-- Petroleum Based - |
| (Material No.12ACC1) | Corrosion Preventive Compound-Heavy Duty Soft Film - |
| No specific | lockwire corrosion resistant steel 0.8 mm (0.03 in.) |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 17 | COTTER PIN | AIPC 32-31-01-05-010 |
| 26 | COTTER PIN | AIPC 32-31-01-09-010 |
| 42 | COTTER PIN | AIPC 32-31-01-09-010 |
| 35 | LOCKWASHER | AIPC 32-31-01-14-255 |
| 17 | COTTER PIN | AIPC 32-31-81-05-010 |
| 26 | COTTER PIN | AIPC 32-31-81-09-010 |
| 42 | COTTER PIN | AIPC 32-31-81-09-010 |
| 6 | COTTER PIN | AIPC 32-33-01-08-010 |
| 30 | COTTER PIN | AIPC 32-33-01-08-290 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-12-29-611-001-A | Fill the Hydraulic Fluid Reservoir with a Hand Pump |
| 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 29-23-00-863-001-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 32-00-00-860-001-A | Flight Configuration Precautions with Electrical Power |
| TASK 32-00-00-860-001-A-01 | Flight Configuration Precautions without Electrical Power |
| TASK 32-00-00-860-002-A | Ground Configuration after Flight Configuration with Electrical Power |
| TASK 32-00-00-860-002-A-01 | Ground Configuration after Flight Configuration without Electrical Power |
| 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) |
| TASK 12-22-00-00 | LUBRICATION - DESCRIPTION AND OPERATION |
NLG Door Uplock AssySubtask 32-31-14-860-052-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 uplock assy (2534GM).
(7) Make sure that the doors of the nose landing gear are open (Ref. AMM TASK 32-22-00-010-001).
(8) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position in zone 123.
(9) Make sure that you obeyed the flight configuration precautions (Ref. AMM TASK 32-00-00-860-001).
Subtask 32-31-14-865-051-A (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 uplock assy (2534GM).
(7) Make sure that the doors of the nose landing gear are open (Ref. AMM TASK 32-22-00-010-001).
(8) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position in zone 123.
(9) Make sure that you obeyed the flight configuration precautions (Ref. AMM TASK 32-00-00-860-001).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
Subtask 32-31-14-110-050-A
A. Preparation for Installation
(1) Clean the junction components with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and dry them with dry and filtered compressed air.
(2) Apply a thin layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) to the nuts and bolts.
Subtask 32-31-14-420-052-B (1) Clean the junction components with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and dry them with dry and filtered compressed air.
(2) Apply a thin layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) to the nuts and bolts.
NOTE: For lubricant grease specification and lubrication requirements, refer to (Ref. AMM D/O 12-22-00-00).
B. Installation of the NLG Door Uplock Assy
(2) Install the lever (33) on the unit (12). Install the screw (34), the washer (32) and the nut (31). Tighten the nut (31) and safety it with the new AIPC 32-33-01-08-290 COTTER PIN (30).
(3) Remove the 98D32203502000 SAFETY PIN - NLG DOOR
(4) Manually close the NLG doors to half travel to permit passage of the unit and install the unit (12) in the support (14) and install the bolts (13).
(5) Open the NLG doors again and put the 98D32203502000 SAFETY PIN - NLG DOOR in position.
(6) Install the washers (24) and the nuts (18).
(7) TORQUE the nuts (18) to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft ) and safety them with the new AIPC 32-31-01-05-010 COTTER PIN (17) or AIPC 32-31-81-05-010 COTTER PIN (17).
(8) Install the spacer (37) and the shim between the spacer and the rear flange.
(9) Install the AIPC 32-31-01-14-255 LOCKWASHER (35) and the bolt (36). Safety the bolt (36) with the lockwasher (35).
(10) Install the washer (38) and the bolt (39).
(11) Safety the bolt (39) with lockwire corrosion resistant steel 0.8 mm (0.03 in.).
(12) Install the 98A32301000000 RIGGING PIN (11) on the aft lever (33) of the unit (12).
Subtask 32-31-14-420-050-B WARNING:
MAKE SURE THAT THE NLG DOWNLOCK SAFETY PIN AND THE TWO DOOR SAFETY PINS ARE INSTALLED.
(1) Install the lever (43) on the unit (12). Install the screw (44), the washer (41) and the nut (40). Tighten the nut (40) and safety it with the new AIPC 32-31-01-09-010 COTTER PIN (42) or AIPC 32-31-81-09-010 COTTER PIN (42). (2) Install the lever (33) on the unit (12). Install the screw (34), the washer (32) and the nut (31). Tighten the nut (31) and safety it with the new AIPC 32-33-01-08-290 COTTER PIN (30).
(3) Remove the 98D32203502000 SAFETY PIN - NLG DOOR
(4) Manually close the NLG doors to half travel to permit passage of the unit and install the unit (12) in the support (14) and install the bolts (13).
(5) Open the NLG doors again and put the 98D32203502000 SAFETY PIN - NLG DOOR in position.
(6) Install the washers (24) and the nuts (18).
(7) TORQUE the nuts (18) to between 1.6 and 1.4 m.daN (11.80 and 10.32 lbf.ft )
and safety them with the new AIPC 32-31-01-05-010 COTTER PIN (17) or AIPC 32-31-81-05-010 COTTER PIN (17). (8) Install the spacer (37) and the shim between the spacer and the rear flange.
(9) Install the AIPC 32-31-01-14-255 LOCKWASHER (35) and the bolt (36). Safety the bolt (36) with the lockwasher (35).
(10) Install the washer (38) and the bolt (39).
(11) Safety the bolt (39) with lockwire corrosion resistant steel 0.8 mm (0.03 in.).
(12) Install the 98A32301000000 RIGGING PIN (11) on the aft lever (33) of the unit (12).
C. Connection of the Rod (8)
(1) Install the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) on the bellcrank (1).
(2) Put the end of the rod (8) on the lever (33). Make sure that you can install the bolt (7).
(3) If you cannot install the bolt (7) adjust the rod (8) as follows:
(a) Cut and remove the lockwire and discard it. Remove the nuts (2).
(b) Release the washers (3) and adjust the rod (9) so that you can install the bolt (7) and the rod (8).
(c) TORQUE the nuts (2) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in ).
(d) Safety the nuts (2) with lockwire corrosion resistant steel 0.8 mm (0.03 in.).
(4) Install the washer (4) and the nut (5).
(5) TORQUE the nut (5) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ) and safety it with the new AIPC 32-33-01-08-010 COTTER PIN (6).
(6) Remove the 98A32301000000 RIGGING PIN (11) and 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) from the unit (12) and the bellcrank (1).
Subtask 32-31-14-420-051-B (1) Install the 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) on the bellcrank (1).
(2) Put the end of the rod (8) on the lever (33). Make sure that you can install the bolt (7).
(3) If you cannot install the bolt (7) adjust the rod (8) as follows:
(a) Cut and remove the lockwire and discard it. Remove the nuts (2).
(b) Release the washers (3) and adjust the rod (9) so that you can install the bolt (7) and the rod (8).
(c) TORQUE the nuts (2) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in )
. (d) Safety the nuts (2) with lockwire corrosion resistant steel 0.8 mm (0.03 in.).
(4) Install the washer (4) and the nut (5).
(5) TORQUE the nut (5) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in )
and safety it with the new AIPC 32-33-01-08-010 COTTER PIN (6). (6) Remove the 98A32301000000 RIGGING PIN (11) and 98A27901002000 PIN-RIGGING,RUDDER CONTROL (10) from the unit (12) and the bellcrank (1).
D. Connection of the Hydraulic and Electrical lines
(1) Remove the blanking plugs. Connect the hydraulic lines (15) and (16).
(2) TORQUE the hydraulic lines (15) and (16) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ).
(3) Remove the blanking caps. Connect the electrical lines (22) and (23).
Subtask 32-31-14-865-053-A (1) Remove the blanking plugs. Connect the hydraulic lines (15) and (16).
(2) TORQUE the hydraulic lines (15) and (16) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
. (3) Remove the blanking caps. Connect the electrical lines (22) and (23).
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 32-31-14-869-053-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
F. After you close the LGCIU circuit breakers, put the aircraft back to the correct (ground) condition (Ref. AMM TASK 32-00-00-860-002).
Subtask 32-31-14-420-053-B G. Connection of the Rod (21)
(1) Pressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
(2) Make sure that the 98D32203502000 SAFETY PIN - NLG DOOR are installed in the rigging holes of the left and right nose gears doors
(3) Remove the safety pin of the control lever. Put the control lever in the DOOR CLOSED position. Install the safety pin of the contol lever.
(4) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(5) Install the 98A32301000000 RIGGING PIN (29) on the forward lever (43) of the unit (12).
(6) Put the end of the rod (21) in position on the lever (43). Make sure that you can install the bolt (25).
(7) If you cannot install the bolt (25), adjust the rod (21) as follows:
(a) Cut and remove the lockwire. Remove the nuts (19).
(b) Release the washers (20). Adjust the length of the rod (21) so that you can install the bolt (25).
(c) TORQUE the nuts (19) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in ).
(d) Safety the nuts (19) with lockwire corrosion resistant steel 0.8 mm (0.03 in.).
(e) Put the rod (21) in position and install the bolt (25).
(8) Install the washer (28) and the nut (27). Tighten the nut (27) and safety with the new AIPC 32-31-01-09-010 COTTER PIN (26) or AIPC 32-31-81-09-010 COTTER PIN (26).
Subtask 32-31-14-914-050-B (1) Pressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
(2) Make sure that the 98D32203502000 SAFETY PIN - NLG DOOR are installed in the rigging holes of the left and right nose gears doors
(3) Remove the safety pin of the control lever. Put the control lever in the DOOR CLOSED position. Install the safety pin of the contol lever.
(4) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(5) Install the 98A32301000000 RIGGING PIN (29) on the forward lever (43) of the unit (12).
(6) Put the end of the rod (21) in position on the lever (43). Make sure that you can install the bolt (25).
(7) If you cannot install the bolt (25), adjust the rod (21) as follows:
(a) Cut and remove the lockwire. Remove the nuts (19).
(b) Release the washers (20). Adjust the length of the rod (21) so that you can install the bolt (25).
(c) TORQUE the nuts (19) to between 0.649 and 0.531 m.daN (57.43 and 46.99 lbf.in )
. (d) Safety the nuts (19) with lockwire corrosion resistant steel 0.8 mm (0.03 in.).
(e) Put the rod (21) in position and install the bolt (25).
(8) Install the washer (28) and the nut (27). Tighten the nut (27) and safety with the new AIPC 32-31-01-09-010 COTTER PIN (26) or AIPC 32-31-81-09-010 COTTER PIN (26).
H. Apply the Sealants
(1) Apply a light coat of Corrosion Preventive Compound-Heavy Duty Soft Film - (Material No.12ACC1) in zones F.
(2) Apply a bead of Polysulfide Sealant_General Purpose Brushable - (Material No.06AAA1) around the flanges of the spacer (37) in zones G.
Subtask 32-31-14-941-054-A (1) Apply a light coat of Corrosion Preventive Compound-Heavy Duty Soft Film - (Material No.12ACC1) in zones F.
(2) Apply a bead of Polysulfide Sealant_General Purpose Brushable - (Material No.06AAA1) around the flanges of the spacer (37) in zones G.
I. Preparation for the Test
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the 98A32301000000 RIGGING PIN (29) from the unit (12).
(3) Remove the safety pin from the door ground-opening handle.
(4) Put the door ground-opening handle in the open position.
(5) Install the safety pin on the handle.
(6) Make sure that the NLG door uplock assy (2534GM) is in the open configuration.
(7) Remove the container from below the NLG door uplock assy (2534GM).
(8) Make sure that the travel range of the NLG doors is clean and clear of tools and other items.
(9) Remove the access platform(s).
(10) Put the Green hydraulic system back to the serviceable condition (Ref. AMM TASK 29-00-00-864-001).
(11) Make sure that the Green hydraulic system is pressurized with the PTU.
(12) Adjust the hydraulic power unit for minimum pressure and flow rate.
(13) Do five full DOOR CLOSE/DOOR OPEN cycles (Ref. AMM TASK 32-22-00-010-001), (Ref. AMM TASK 32-22-00-410-001) to bleed the hydraulic system.
Subtask 32-31-14-720-050-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the 98A32301000000 RIGGING PIN (29) from the unit (12).
(3) Remove the safety pin from the door ground-opening handle.
(4) Put the door ground-opening handle in the open position.
(5) Install the safety pin on the handle.
(6) Make sure that the NLG door uplock assy (2534GM) is in the open configuration.
(7) Remove the container from below the NLG door uplock assy (2534GM).
(8) Make sure that the travel range of the NLG doors is clean and clear of tools and other items.
(9) Remove the access platform(s).
(10) Put the Green hydraulic system back to the serviceable condition (Ref. AMM TASK 29-00-00-864-001).
(11) Make sure that the Green hydraulic system is pressurized with the PTU.
(12) Adjust the hydraulic power unit for minimum pressure and flow rate.
(13) Do five full DOOR CLOSE/DOOR OPEN cycles (Ref. AMM TASK 32-22-00-010-001), (Ref. AMM TASK 32-22-00-410-001) to bleed the hydraulic system.
J. Functional Test
(1) Do an operational test of the landing gear doors (Ref. AMM TASK 32-31-00-710-002).
(2) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(3) Put the access platform in position below the NLG door uplock assy (2534GM).
(4) Make sure that there is no hydraulic fluid leakage from the NLG door uplock assy (2534GM).
(5) If necessary fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).
5. Close-up(1) Do an operational test of the landing gear doors (Ref. AMM TASK 32-31-00-710-002).
(2) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(3) Put the access platform in position below the NLG door uplock assy (2534GM).
(4) Make sure that there is no hydraulic fluid leakage from the NLG door uplock assy (2534GM).
(5) If necessary fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).
Subtask 32-31-14-410-051-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(5) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(5) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).