Removal of the MLG Check Valves

TASK 32-31-36-000-001-A
Removal of the MLG Check Valves

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: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

ZONE: 743
FIN: 2519GM
FIN: 2525GM
FIN: 2529GM

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 - HYDRAULIC FLUID RESISTANT
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
743	SECONDARY 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 Check Valves 2519GM, 2525GM and 2529GM

3. Job Set-up
Subtask 32-31-36-860-050-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).

Subtask 32-31-36-010-050-A

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

Subtask 32-31-36-869-050-A

C. Disconnection of the PTU Isolation coupling
(1) Depressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(2) Disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(3) Obey the flight configuration precautions (Ref. AMM TASK 32-00-00-860-001).
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.
(5) Put the CONTAINER - HYDRAULIC FLUID RESISTANT below the check valves to collect the hydraulic fluid leakage.

Subtask 32-31-36-865-050-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 32-31-36-941-050-A

E. Safety Precautions
(1) Put the WARNING NOTICE(S) in the 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 32-31-36-020-051-A

A. Removal of the Check Valve 2519GM
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Disconnect the connectors (8), (9) and (14) from the union (11).
(3) Disconnect connector (10) and remove the union (11) with the check valve (13).
(4) Remove the check valve (13) from the union (11).
(5) Remove and discard the packing (12).
(6) Remove the check valve 2519GM.
(7) Put the PLUG-BLANKING in each disconnected line end.

Subtask 32-31-36-020-052-A

B. Removal of the Check Valve 2525GM
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Disconnect the connector (3).
(3) Remove the check valve (4) from the manifold (6).
(4) Remove and discard the packing (5).
(5) Remove the check valve 2525GM.
(6) Put the PLUG-BLANKING in each disconnected line end.

Subtask 32-31-36-020-053-A

C. Removal of the Check Valve 2529GM
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Disconnect the connectors (15) from the union (2).
(3) Disconnect the connector (1) from check valve (7) and remove the union (2).
(4) Remove the check valve (7) from the manifold (6).
(5) Remove and discard the packing (5).
(6) Remove the check valve 2529GM.
(7) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 00:45:07 UTC