Removal of the MLG Door Actuating-Cylinder

TASK 32-31-35-000-001-A
Removal of the MLG Door Actuating-Cylinder

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.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

ZONE: 734
ZONE: 744
FIN: 2522GM
FIN: 2523GM

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
734	MAIN DOOR
744	MAIN DOOR

C. Referenced Information

REFERENCE	DESIGNATION
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 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 32-12-00-010-001-A	Open the Main Gear Doors for Access
MLG Door Actuating-Cylinder ** ON A/C NOT FOR ALL
MLG Door Actuating-Cylinder ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-31-35-860-050-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002)
(2) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(3) Depressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-31-35-010-051-A

B. Get Access
(1) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).

Subtask 32-31-35-869-050-A

C. Disconnection of the PTU Isolation Coupling
(1) Disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(2) Obey the flight configuration precautions (Ref. AMM TASK 32-00-00-860-001).
(3) Put the ACCESS PLATFORM 1M(3 FT) in position.
(4) Put the CONTAINER 5 L (1.32 USGAL) below the actuating cylinder 2523GM (2522GM) to collect the hydraulic fluid leakage.

Subtask 32-31-35-865-053-A

D. Open, safety and tag this(these) circuit breaker(s):

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

Subtask 32-31-35-941-050-A

E. Safety Precautions
(1) Put the WARNING NOTICE(S) 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.

4. Procedure
Subtask 32-31-35-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Actuating-Cylinder

MLG Door Actuating-Cylinder ** ON A/C NOT FOR ALL

NOTE: The MLG door actuator-bearing housing can show signs of circular movement. This is permitted, but if there is lateral movement of the MLG door actuator-bearing housing, you must replace the bearing housing.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Disconnect the connectors (3) from the actuating-cylinder (4).
(3) Put the PLUG-BLANKING in each disconnected line end.

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

(4) Remove and discard the cotter pins (9) and (11) from the bolts (1) and (10).
(5) Use a SCRAPER - NON METALLIC and remove the sealant from the bolts (1) and (10) and the nuts (8) and (12).
(6) Remove the nuts (8) and (12) and the washers (7) and (13) from the bolts (1) and (10).
(7) Remove the spacers (6) and (14) from the bolts (1) and (10).
(8) Hold the actuating-cylinder (4) and remove the bolts (1) and (10) and the shim washer (5).
(a) Make sure that the shim washer (5) does not fall.
(9) Remove the actuating-cylinder (4).

Subtask 32-31-35-020-051-C ** ON A/C NOT FOR ALL

A. Removal of the Actuating-Cylinder

MLG Door Actuating-Cylinder ** ON A/C NOT FOR ALL

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Disconnect the connectors (3) from the actuating-cylinder (4).
(3) Put the PLUG-BLANKING in each disconnected line end.

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

(4) Remove and discard the cotter pins (8) and (12) from the bolts (1) and (9).
(5) Use a SCRAPER - NON METALLIC and remove the sealant from the bolts (1) and (9) and the nuts (7) and (13).
(6) Remove the nuts (7) and (13) and the washers (6) and (11) from the bolts (1) and (9).
(7) Remove the spacers (5) and (10) from the bolts (1) and (9).
(8) Remove the bolts (1) and (9).
(9) Remove the actuating-cylinder (4).

[Rev.10 from 2021] 2026.04.01 12:30:17 UTC