Installation of the Landing-Gear (L/G) Selector Valve

TASK 32-31-12-400-001-A
Installation of the Landing-Gear (L/G) Selector Valve

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.

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

ZONE: 744

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

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 0.99 and 0.81 m.daN (87.61 and 71.68 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
744	MAIN DOOR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
6	SEALS	AIPC 32-31-32-01-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
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 29-00-00-910-002-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 32-31-00-720-002-A	Functional Test of the Normal Extension and Retraction of the Landing Gear
TASK 51-75-13-916-002-A	Repair to a layer of Corrosion Preventive Compound
L/G Selector Valve 40GA

3. Job Set-up
Subtask 32-31-12-860-051-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 electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002) or the flight configuration precautions were obeyed (Ref. AMM TASK 32-00-00-860-001).
(3) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(4) Make sure that the warning notices 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.

(5) Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-31-12-560-050-A

B. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(5) Apply the Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new AIPC 32-31-32-01-010 SEALS (6).

Subtask 32-31-12-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
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

4. Procedure
Subtask 32-31-12-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the L/G Selector Valve 40GA
(1) Make sure that the L/G selector valve (3) has the DI or DI-BE stamp on the amendment plate:
(a) If the L/G selector valve (3) does not have the stamp:

Do the Inspection Service Bulletin (Ref. ISB 32-1290) before you do steps (2) thru (12).

NOTE: If a Post SB 32-1348 valve (P/N 114079019) is installed, it is not necessary to do the ISB 32-1290.

(b) If the L/G selector valve (3) does have the stamp, continue with steps (2) thru (12).
(2) Remove the PLUG-BLANKING from each disconnected line end.
(3) Install the new AIPC 32-31-32-01-010 SEALS (6) in the hydraulic interface connections of the manifold (5).
(4) Make sure that the seals (6) are installed with the PTFE backing ring on the top.
(5) Put the L/G selector valve (3) on the manifold (5).
(6) Make sure that the locating pin on the manifold (5) is in the locating hole in the L/G selector valve (3).
(7) Install the washers (2) and the screws (1).
(8) TORQUE the screws (1) to between 0.99 and 0.81 m.daN (87.61 and 71.68 lbf.in )

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.

(9) Safety the screws (1) on the forward edge of the L/G selector valve (3) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(10) Remove the CAP-BLANKING from each electrical connector and receptacle.
(11) Make sure that all the electrical connections are clean and in the correct condition.
(12) Connect the electrical connectors (4).

Subtask 32-31-12-420-050-C ** ON A/C NOT FOR ALL

A. Installation of the L/G Selector Valve 40GA
(1) If a Pre SB 32-1348 L/G selector valve (P/N 114079017) is installed, do as follows:
(a) Make sure that the L/G selector valve (3) has the DI or DI-BE stamp on the amendment plate.
1 If the L/G selector valve (3) does not have the stamp:

Do the Inspection Service Bulletin (Ref. ISB 32-1290) before you do steps (2) thru (12).

NOTE: If a Post SB 32-1348 valve (P/N 114079019) is installed, it is not necessary to do the ISB 32-1290.

2 If the L/G selector valve (3) does have the stamp, continue with steps (2) thru (12).
(2) Remove the PLUG-BLANKING from each disconnected line end.
(3) Install the new AIPC 32-31-32-01-010 SEALS (6) in the hydraulic interface connections of the manifold (5).
(4) Make sure that the new seals (6) are installed with the PTFE backing ring on the top.
(5) Put the L/G selector valve (3) on the manifold (5).
(6) Make sure that the locating pin on the manifold (5) is in the locating hole in the L/G selector valve (3).
(7) Install the washers (2) and the screws (1).
(8) TORQUE the screws (1) to between 0.99 and 0.81 m.daN (87.61 and 71.68 lbf.in )

Subtask 32-31-12-865-053-A

B. 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 32-31-12-869-052-A

C. Put the aircraft back to the ground condition.
(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).

Subtask 32-31-12-860-052-A

D. Preparation for Test
(1) Remove the container.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(5) If necessary fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).

Subtask 32-31-12-720-050-A

E. Do this Test
(1) Do the functional test of the normal extension and retraction system of the landing gear (Ref. AMM TASK 32-31-00-720-002).
(2) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that there is no hydraulic fluid leakage from the L/G selector valve 40GA.

5. Close-up
Subtask 32-31-12-410-050-A

A. Close Access
(1) Apply corrosion protection to the screws (1) and the adjacent areas (Ref. AMM TASK 51-75-13-916-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the right 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 12:31:05 UTC