Installation of the MLG Check Valves

TASK 32-31-36-400-001-A
Installation 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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 17 and 15 m.N (12.54 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )
No specific	Torque wrench: range to between 59 and 54 m.N (43.51 and 39.82 lbf.ft )
No specific	Torque wrench: range to between 86.9 and 71.1 m.N (64.09 and 52.43 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
743	SECONDARY DOOR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
5	PACKING	AIPC 32-31-03-10-220
12	PACKING	AIPC 32-31-03-15-040
5	PACKING	AIPC 32-31-83-04-190
12	PACKING	AIPC 32-31-83-12-040

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
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 32-33-00-720-001-A	Functional Check of Free-Fall Extension
TASK 51-75-13-916-002-A	Repair to a layer of Corrosion Preventive Compound
MLG Check Valves 2519GM, 2525GM and 2529GM

3. Job Set-up
Subtask 32-31-36-860-051-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 32-31-36-865-052-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 32-31-36-941-051-A

C. Make sure that the WARNING NOTICE(S) 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.

Subtask 32-31-36-560-050-A

D. Preparation for Installation
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002)
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Clean the component interfaces and the adjacent area.
(4) Do an inspection of the component interfaces and the adjacent area.
(5) Preparation of check valve 2519GM:
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the check valve (13).
(c) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new AIPC 32-31-03-15-040 PACKING (12) or the new AIPC 32-31-83-12-040 PACKING (12).
(d) Put the packing (12) on the check valve (13).
(6) Preparation of check valve 2525GM:
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the check valve (4).
(c) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new AIPC 32-31-03-10-220 PACKING (5) or the new AIPC 32-31-83-04-190 PACKING (5).
(d) Put the packing (5) on the check valve (4).
(7) Preparation of check valve 2529GM:
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the check valve (7).
(c) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new AIPC 32-31-03-10-220 PACKING (5) or the new AIPC 32-31-83-04-190 PACKING (5).
(d) Put the packing (5) on the check valve (7).

4. Procedure
Subtask 32-31-36-420-051-A

A. Installation of Check Valve 2519GM
(1) Install the check valve (13) in the union (11).
(2) TORQUE the check valve (13) to between 86.9 and 71.1 m.N (64.09 and 52.43 lbf.ft )

.
(3) Put the union (11) together with the check valve (13) in position and tighten the connectors (10), (14), (9) and (8).
(4) TORQUE the connector (10) to between 59 and 54 m.N (43.51 and 39.82 lbf.ft )

.
(5) TORQUE the connector (14) to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )

.
(6) TORQUE the connector (9) to between 59 and 54 m.N (43.51 and 39.82 lbf.ft )

.
(7) TORQUE the connector (8) to between 17 and 15 m.N (12.54 and 11.06 lbf.ft )

.
(8) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-31-36-420-053-A

B. Installation of the Check Valve 2525GM
(1) Install the check valve (4) in the manifold (6).
(2) TORQUE the check valve (4) to between 86.9 and 71.1 m.N (64.09 and 52.43 lbf.ft )

.
(3) Connect the connector (3) to the check valve (4).
(4) TORQUE the connector (3) to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )

.
(5) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-31-36-420-054-A

C. Installation of Check Valve 2529GM
(1) Install the check valve (7) in the manifold (6).
(2) TORQUE the check valve (7) to between 86.9 and 71.1 m.N (64.09 and 52.43 lbf.ft )

.
(3) Connect the connector (1) to the check valve (7).
(4) TORQUE the connector (1) to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )

.
(5) Connect the connectors (15) to the unions (2).
(6) TORQUE the connectors (15) to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )

.
(7) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-31-36-865-051-A

D. Remove the safety clip(s) and the tag(s) and close 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 32-31-36-860-052-A

E. 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 container.
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).
(6) Close the left 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 32-31-36-720-050-A

F. Test
(1) Do the functional check of the free-fall extension (Ref. AMM TASK 32-33-00-720-001).
(2) Open the left MLG door (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that there is no hydraulic fluid leakage from the check valve(s).

5. Close-up
Subtask 32-31-36-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Apply corrosion protection to the check valve(s), the pipe connections and the adjacent areas (Ref. AMM TASK 51-75-13-916-002).
(3) Close the left 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.

[Rev.10 from 2021] 2026.04.01 00:45:08 UTC