DOC AIRBUS | AMM A320FRemoval of the MLG Lockstay Actuating-Cylinder
TASK 32-11-21-000-001-A
Removal of the MLG Lockstay Actuating-Cylinder
To remove the MLG lockstay actuating cylinder with the aircraft lifted on jacks.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 32-11-21-941-050-A
Subtask 32-11-21-020-051-A
[Rev.10 from 2021]
2026.04.01 00:40:41 UTC
Removal of the MLG Lockstay Actuating-Cylinder
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
1. Reason for the Job- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
To remove the MLG lockstay actuating cylinder with the aircraft lifted on jacks.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | 1 | CONTAINER 1 L (1/4 USGAL) |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| 460006437 | 1 | TOOL-HOLDING |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 07-11-00-581-001-A | Lifting for Aircraft Maintenance Operations |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| 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 29-23-00-860-001-A | Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 32-00-00-481-001-A | Installation of the Safety Devices on the Landing Gears |
| 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 32-11-19-000-003-A | Disconnection of one end of the MLG Lock Springs from a MLG Side-Stay |
MLG Lockstay Actuating-CylinderSubtask 32-11-21-941-050-A
A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:
Subtask 32-11-21-582-050-A (1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:
- Make sure that the landing-gear control-lever 6GA is in the DOWN position
- Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.
B. Lift the Aircraft
(1) Lift the aircraft on jacks (Ref. AMM TASK 07-11-00-581-001).
(2) Make sure that the safety device is installed on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).
Subtask 32-11-21-860-050-A (1) Lift the aircraft on jacks (Ref. AMM TASK 07-11-00-581-001).
(2) Make sure that the safety device is installed on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).
C. Aircraft Maintenance Configuration
(1) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the Yellow and Green hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001).
(3) Depressurize the Green Hydraulic-system reservoir (Ref. AMM TASK 29-14-00-614-001).
Subtask 32-11-21-869-053-A (1) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the Yellow and Green hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001).
(3) Depressurize the Green Hydraulic-system reservoir (Ref. AMM TASK 29-14-00-614-001).
D. Flight Configuration Precautions
(1) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to operate the LGCIU circuit breakers.
(2) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.
Subtask 32-11-21-865-050-A (1) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to operate the LGCIU circuit breakers.
(2) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.
E. Open, safety and tag this(these) circuit breaker(s):
Subtask 32-11-21-010-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R33 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R32 |
| ** 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 | LGCIU/BAT SPLY/SYS2 | 59GA | R32 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R31 |
F. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) below the applicable MLG lockstay actuating cylinder, at zone 731 or 741.
(2) Put a CONTAINER 1 L (1/4 USGAL) below the applicable actuating cylinder.
4. Procedure(1) Put an ACCESS PLATFORM 2M (6 FT) below the applicable MLG lockstay actuating cylinder, at zone 731 or 741.
(2) Put a CONTAINER 1 L (1/4 USGAL) below the applicable actuating cylinder.
Subtask 32-11-21-020-051-A
A. Removal of the MLG Lockstay Actuating-Cylinder
(2) Remove the MLG lockstay actuating-cylinder as follows:
(a) Remove and discard the cotter pin (10).
(b) Remove the nut (9) and the washer (8).
(c) Release the tab washer (16).
(d) Use the 460006437 TOOL-HOLDING to hold the pin (13) and remove the bolt (15), the tab washer (16) and the sleeve (17). Discard the tab washer (16).
(e) Remove and discard the lockwire from the bolts (5).
(g) Move the hoses (1) away from the actuating cylinder (12).
(h) Remove and discard the packings (3) and the back-up packings (2).
(i) Put the PLUG-BLANKING in each disconnected line end.
(3) If you have to replace the actuating cylinder, remove the GROUND LOCK SLEEVE from the applicable actuating cylinder.
(4) Hold the actuating cylinder (12) (weight 3.3 kg (7.3 lb)) and remove the:
WARNING:
DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
- FLUSH IT AWAY WITH CLEAN WATER
- GET MEDICAL AID.
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.
CAUTION:
MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
(1) Disconnect one end of the MLG lock springs from the MLG side-stay (Ref. AMM TASK 32-11-19-000-003). (2) Remove the MLG lockstay actuating-cylinder as follows:
(a) Remove and discard the cotter pin (10).
(b) Remove the nut (9) and the washer (8).
(c) Release the tab washer (16).
(d) Use the 460006437 TOOL-HOLDING to hold the pin (13) and remove the bolt (15), the tab washer (16) and the sleeve (17). Discard the tab washer (16).
(e) Remove and discard the lockwire from the bolts (5).
CAUTION:
DURING REMOVAL OF THE LOCKSTAY ACTUATOR HOSES, MAKE SURE THAT YOU DO NOT LOOSEN THE SWAGED FITTINGS OF THE HOSES. IF YOU DO NOT OBEY THIS INSTRUCTION, RUPTURE OF THE LOCKSTAY ACTUATOR HOSES CAN OCCUR.
(f) Remove the bolts (5) and the washers (4) from the hoses (1). (g) Move the hoses (1) away from the actuating cylinder (12).
(h) Remove and discard the packings (3) and the back-up packings (2).
(i) Put the PLUG-BLANKING in each disconnected line end.
(3) If you have to replace the actuating cylinder, remove the GROUND LOCK SLEEVE from the applicable actuating cylinder.
(4) Hold the actuating cylinder (12) (weight 3.3 kg (7.3 lb)) and remove the:
- Pin (7)
- Washers (6) and (11)
- Pin (13)
- Washers (14).