DOC AIRBUS | AMM A320FInstallation of the MLG Door Swivel-Joint Assembly
TASK 32-31-38-400-001-A
Installation of the MLG Door Swivel-Joint Assembly
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 32-31-38-860-051-A
Subtask 32-31-38-420-050-A
Subtask 32-31-38-410-050-A
[Rev.10 from 2021]
2026.04.01 00:45:15 UTC
Installation of the MLG Door Swivel-Joint Assembly
WARNING:
MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
WARNING:
OBEY THE HYDRAULIC SAFETY PROCEDURES.
WORK ON THE HYDRAULIC SYSTEMS CAN BE DANGEROUS.
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
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02ABA1) | Phosphate Ester Hydraulic Fluid-General Power - - |
| (Material No.04SAB2) | Varnish Polyurethane-- Marking Structure |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-12-29-611-001-A | Fill the Hydraulic Fluid Reservoir with a Hand Pump |
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 29-00-00-910-002-A | Safety Procedures of the Hydraulic System |
| 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 29-23-00-860-001-A | Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 29-23-00-860-002-A | Connection of the Isolation Coupling of the Power Transfer Unit (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 32-12-00-010-001-A | Open the Main Gear Doors for Access |
| TASK 32-12-00-410-001-A | Close the Main Gear Doors after Access |
| 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 51-75-13-916-002-A | Repair to a layer of Corrosion Preventive Compound |
MLG Door Swivel-Joint Assembly 2763GM (2764GM)Subtask 32-31-38-860-051-A
A. Aircraft Maintenance Configuration
(1) Make sure that the PTU isolation coupling is disconnected (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(3) Make sure that the flight configuration precautions were obeyed (Ref. AMM TASK 32-00-00-860-001).
(4) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(5) Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
Subtask 32-31-38-865-051-A (1) Make sure that the PTU isolation coupling is disconnected (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(3) Make sure that the flight configuration precautions were obeyed (Ref. AMM TASK 32-00-00-860-001).
(4) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(5) Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 32-31-38-941-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | HYDRAULIC/G HYD/PUMP ENG1/CTL | 1701GK | H12 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/CTL | 1701GK | R35 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R34 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R33 |
C. Safety Precautions
(1) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Green hydraulic system:
Subtask 32-31-38-560-050-A (1) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Green hydraulic system:
- On panel 40VU in the cockpit
- On the ground service panel of the Green hydraulic system.
D. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Loosen the nuts (3).
(5) Remove the PLUG-BLANKING from each disconnected line end.
(6) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(7) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the swivel joints (5).
4. Procedure(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Loosen the nuts (3).
(5) Remove the PLUG-BLANKING from each disconnected line end.
(6) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(7) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the swivel joints (5).
Subtask 32-31-38-420-050-A
A. Installation of the MLG Door Swivel-Joint Assembly 2763GM (2764GM)
(1) Put the swivel joints (5) in position and install the connectors (8). Do not tighten the connectors (8) at this time.
(2) Make sure that the swivel joint (5) alignment is parallel to the aircraft axis.
(4) Install the bolt (6) and the nut (3). TORQUE the nut (3) to between 1.81 and 1.58 m.daN (13.35 and 11.65 lbf.ft )
.
(5) Make sure that the swivel joints (5) are in the correct position and tighten the connectors (8). TORQUE the connectors (8) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ).
(6) Put the flexible hoses (1) in position and connect the connectors (2) to the swivel joints (5).
(7) TORQUE the connectors (2) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ).
(8) Make a mark on all the connectors with a line of Varnish Polyurethane-- Marking Structure (Material No.04SAB2) .
Subtask 32-31-38-865-052-A (1) Put the swivel joints (5) in position and install the connectors (8). Do not tighten the connectors (8) at this time.
(2) Make sure that the swivel joint (5) alignment is parallel to the aircraft axis.
NOTE: A swivel joint that is not aligned correctly can decrease the bend radius of its related flexible hose. This can cause increased strain on the hose and possible hose damage.
(3) Put the bracket (4), equally positioned, on the swivel joints (5). (4) Install the bolt (6) and the nut (3). TORQUE the nut (3) to between 1.81 and 1.58 m.daN (13.35 and 11.65 lbf.ft )
. (5) Make sure that the swivel joints (5) are in the correct position and tighten the connectors (8). TORQUE the connectors (8) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
. (6) Put the flexible hoses (1) in position and connect the connectors (2) to the swivel joints (5).
(7) TORQUE the connectors (2) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
. (8) Make a mark on all the connectors with a line of Varnish Polyurethane-- Marking Structure (Material No.04SAB2) .
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 32-31-38-860-052-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | HYDRAULIC/G HYD/PUMP ENG1/CTL | 1701GK | H12 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/CTL | 1701GK | R35 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R34 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R33 |
C. Preparation for Test
(1) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(2) If the flight configuration precautions were obeyed, put the aircraft back to the serviceable condition (Ref. AMM TASK 32-00-00-860-002).
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the CONTAINER - HYDRAULIC FLUID RESISTANT.
(6) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(7) If necessary, fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).
Subtask 32-31-38-710-050-A (1) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(2) If the flight configuration precautions were obeyed, put the aircraft back to the serviceable condition (Ref. AMM TASK 32-00-00-860-002).
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the CONTAINER - HYDRAULIC FLUID RESISTANT.
(6) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(7) If necessary, fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).
D. Test
(1) Do the operational test of the MLG doors (Ref. AMM TASK 32-31-00-710-002).
(2) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that there is no hydraulic fluid leakage from the swivel joint assembly 2763GM (2764GM). Leaks are not permitted.
5. Close-up(1) Do the operational test of the MLG doors (Ref. AMM TASK 32-31-00-710-002).
(2) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that there is no hydraulic fluid leakage from the swivel joint assembly 2763GM (2764GM). Leaks are not permitted.
Subtask 32-31-38-410-050-A
A. Close Access
(1) Apply corrosion protection to the swivel joints and the adjacent areas (Ref. AMM TASK 51-75-13-916-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(1) Apply corrosion protection to the swivel joints and the adjacent areas (Ref. AMM TASK 51-75-13-916-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.