Installation of the Normal Brake-Return Check-Valve

TASK 32-42-77-400-001-A
Installation of the Normal Brake-Return Check-Valve

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

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

FIN: 2593GM
FIN: 2594GM

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 3M (10 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 3.58 and 3.47 m.daN (26.40 and 25.59 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	O-RING	AIPC 32-42-05-22-025

D. 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 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 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-42-00-710-001-A	Operational Check of the Normal Braking System
Check Valve 2593GM (2594GM)

3. Job Set-up
Subtask 32-42-77-941-056-A

A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:

make sure that the landing-gear control-lever is in the DOWN position.
make sure that a WARNING NOTICE(S) is in position to tell persons not the operate the landing gear.

(4) On panel 110VU:

make sure that the free-fall extension-control-handle is in the normal position

(5) Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize the hydraulic systems.

Subtask 32-42-77-860-050-A

B. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 3M (10 FT) is in position below the applicable MLG.
(2) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the applicable hydraulic reservoir has been depressurized (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-42-77-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

4. Procedure
Subtask 32-42-77-420-051-A

A. 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) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Remove the CAP - BLANKING from the check valve (3).
(5) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the AIPC 32-42-05-22-025 O-RING (4) and install the new O-ring (4) on the check valve (3).
(6) Remove the CAP - BLANKING from the open ports of the manifold (5).
(7) Make sure that the interfaces of the check valve (3) are clean and in the correct condition.

Subtask 32-42-77-420-050-A

B. Installation of the Normal Brake-Return Check-Valve
(1) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the check valve (3) and install the check valve (3) on the manifold (5).
(2) TORQUE the normal brake-return check-valve (3) to between 3.58 and 3.47 m.daN (26.40 and 25.59 lbf.ft )

.
(3) Remove the PLUG - BLANKING from the check valve (3) and coupling nut (2).
(4) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the coupling nut (2).
(5) Connect the coupling nut (2) to the check valve (3).
(6) TORQUE the coupling nut (2) to between 3.58 and 3.47 m.daN (26.40 and 25.59 lbf.ft )

Subtask 32-42-77-865-051-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

Subtask 32-42-77-860-051-A

D. Preparation for Test
(1) Pressurize the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) Pressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-863-001).
(3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 32-42-77-710-050-A

E. Test
(1) Do an operational test of the normal brake system. (Ref. AMM TASK 32-42-00-710-001)
(2) Examine the applicable check valve (3) for leaks.

5. Close-up
Subtask 32-42-77-860-052-A

A. Aircraft Configuration
(1) Depressurize the Green hydraulic system (Ref. AMM TASK 29-00-00-864-001).
(2) Depressurize the applicable hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-42-77-942-052-A

B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the SAFETY BARRIER(S).
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the container.
(6) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:48:30 UTC