Removal of the Selector Valve

TASK 32-51-23-000-002-A
Removal of the 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. WORK ON THE HYDRAULIC SYSTEMS CAN BE DANGEROUS.

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	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	CAP - BLANKING
No specific	1	CONTAINER 5 L (1.32 USGAL)
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
744	MAIN DOOR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-21-911-001-A	Removal/Installation of the Bobbins from their Housings and Installation of O-rings, Square Seals, and Back-up Rings on the Bobbins
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
Selector Valve Assembly

3. Job Set-up
Subtask 32-51-23-010-052-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001)
(2) Put the ACCESS PLATFORM 2M (6 FT) in position.

Subtask 32-51-23-860-058-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002):

Do not connect the PTU isolation coupling
Do not close the right MLG door.

(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

On the panel 40VU in the cockpit
On the ground service panel of the Yellow hydraulic system.

(4) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(5) Put a CONTAINER 5 L (1.32 USGAL) below the selector valve (2) to collect the hydraulic fluid leakage.

Subtask 32-51-23-865-058-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ABCU &/Y BRK/PRESS IND	61GG	C10
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR 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
121VU	HYDRAULIC/PARK BRK/CTL/STBY	71GG	N37
121VU	HYDRAULIC/PARK BRK/CTL/NORM	70GG	N36
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C NOT FOR ALL
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

4. Procedure
Subtask 32-51-23-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Selector Valve
(1) Disconnect the electrical connector (1) from the selector valve (2).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the bolt (13), the washer (12) and the bonding strap (11).
(4) Hold the selector valve (2) and remove the bolts (3) and the washers (4).
(5) Remove the selector valve (2) from the manifold (10).
(6) Remove the bobbins (7) (Ref. AMM TASK 20-23-21-911-001) as follows:
(a) Remove the bobbins (7) from the manifold (10).
(b) Remove and discard the O-rings (5) and (9).
(c) Remove and discard the back-up rings (6) and (8).
(d) Keep the bobbins (7) in storage for the subsequent installation procedure.
(7) Put PLUG - BLANKING in the ports of the manifold (10).

[Rev.10 from 2021] 2026.04.01 00:51:39 UTC