Removal of the Fuel Crossfeed Valve

TASK 28-23-41-000-001-A
Removal of the Fuel Crossfeed Valve

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.

ZONE: 141
ZONE: 142
ZONE: 147
ZONE: 148
FIN: 10QM

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	PLUG - BLANKING

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
141	WING CENTER BOX
142	WING CENTER BOX
147	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
148	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
148AZ

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 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 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-23-41-000-002-A	Removal of the Fuel Crossfeed Valve - Drive Assembly
TASK 28-23-51-000-001-A	Removal of the Crossfeed Valve Actuator
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
Crossfeed Valve

3. Job Set-up
Subtask 28-23-41-941-051-A

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) You must obey the special fuel safety procedures when you work in the fuel tank (Ref. AMM TASK 28-10-00-910-001) (Ref. AMM TASK 28-10-00-910-002).

Subtask 28-23-41-650-050-A

B. Defuel the wing and center tanks (Ref. AMM TASK 28-25-00-650-001).

Subtask 28-23-41-861-050-A

C. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 28-23-41-869-050-A

D. On the panel 40VU, make sure that:

the FUEL/X FEED P/BSW 4QE is not pushed in. (The ON and OPEN legends of the P/BSW are off).

Subtask 28-23-41-862-050-A

E. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 28-23-41-010-050-A

F. Get access to the avionics compartment.
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position under the main door of the right main gear.
(2) Open the main door of the right main gear (Ref. AMM TASK 32-12-00-010-001).
(3) Remove the manhole cover 148AZ (Ref. AMM TASK 57-17-11-000-001).

4. Procedure
Subtask 28-23-41-020-051-A

A. Remove the Crossfeed Valve Actuator (5QE) (Ref. AMM TASK 28-23-51-000-001).

Subtask 28-23-41-020-052-A

B. Remove the Drive Assembly (Ref. AMM TASK 28-23-41-000-002).

Subtask 28-23-41-020-050-A

C. Removal of the Fuel Crossfeed Valve (10QM)
(1) Put a CONTAINER 5 L (1.32 USGAL) below the crossfeed valve (11), the pump (19) and the connections between the pipes (26) and (21).
(2) Remove the nuts (10), washers (9), bolts (4) and bonding straps (5) from the crossfeed valve (11).
(3) Remove the nut (20), the bolt (25) and the bonding strap (24) from the pipe (26).
(4) Loosen the nut (29) and disconnect the pipe (28) from the cross union (27).
(5) Remove the screws (16) and the washers (17) from the cross union (27).
(6) Loosen the nuts (8) and (22).
(7) Remove the cross union (27) together with the pipes (6) and (26).

NOTE: The play between the connections of the pipe (6), the pipe (26) and the cross union (27) will help you to release the pipes (6) and (26).

(8) Remove and discard the O-rings (7), (18) and (23).
(9) Loosen the nut (12) and disconnect the pipe (14).
(10) Remove and discard the O-ring (13).
(11) Remove the screws (1) from the rear spar (2).
(12) Carefully remove the crossfeed valve (11) from the rear spar (2).

NOTE: The play between the connections of the pipes (15) and (14) will help you to release the crossfeed valve (11).

(13) Remove and discard the O-ring (3).

Subtask 28-23-41-530-050-A

D. Put a PLUG - BLANKING on the disconnected pump (19) end and the disconnected pipes (6), (14), (21), (26) and (28) ends and the hole openings of the fuel tank.

[Rev.10 from 2021] 2026.04.02 06:17:33 UTC