Removal of the Crossfeed Valve Actuator

TASK 28-23-51-000-001-A
Removal of the Crossfeed Valve Actuator

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

ZONE: 734
ZONE: 744
FIN: 5QE

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	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
734	MAIN DOOR
744	MAIN DOOR

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 32-12-00-010-001-A	Open the Main Gear Doors for Access
Crossfeed Valve Actuator

3. Job Set-up
Subtask 28-23-51-941-051-A

A. Aircraft Maintenance Configuration
(1) On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW is in the off position (the ON legend is off).
(2) On the FUEL overhead panel 40VU, make sure that all L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(3) Put the WARNING NOTICE(S) in position:

on the overhead panel 25VU, to tell persons not to operate the APU MASTER SW,
on the FUEL panel 40VU, to tell persons not to operate the fuel system,
on the APU FIRE panel 20VU, to tell persons not to operate the fire extinguishing system.

Subtask 28-23-51-865-050-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FUEL/X FEED/VALVE/MOT1	2QE	A12
121VU	FUEL/X FEED/VALVE/MOT2	1QE	M24

Subtask 28-23-51-860-050-A

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the FUEL panel 40VU, push the X FEED pushbutton switch (the ON and OPEN legends come on).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 28-23-51-010-050-A

D. Get Access
(1) Open the left Main Landing-Gear (MLG) door to get access to the crossfeed valve actuator (Ref. AMM TASK 32-12-00-010-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position at the LH MLG door.

Subtask 28-23-51-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FUEL/X FEED/VALVE/MOT1	2QE	A12
121VU	FUEL/X FEED/VALVE/MOT2	1QE	M24

4. Procedure
Subtask 28-23-51-020-052-A

A. Removal of the Crossfeed Valve Actuator (5QE)
(1) Before you disconnect the electrical connectors, make sure that there is identification on them. This is important for the subsequent installation procedure.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR IS CLEAN BEFORE YOU DISCONNECT/CONNECT IT. CONTAMINATION OF THE ELECTRICAL CONNECTOR CAN CAUSE INCORRECT FIRE DETECTION.

CAUTION: YOU MUST NOT BEND THE ELECTRICAL HARNESSES TOO MUCH WHEN YOU DISCONNECT THE ELECTRICAL CONNECTORS. THE HARNESSES CAN BE DAMAGED AND CAUSE ELECTRICAL CIRCUIT DEFECT.

(2) Disconnect the electrical connectors (2) from the crossfeed valve actuator (3).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Loosen the screw of the V-clamp (4).
(5) Remove the V-clamp (4) that attaches the crossfeed valve actuator (3) to the mounting flange (6).
(6) Remove the crossfeed valve actuator (3) from the mounting flange (6).
(7) Remove and discard the O-ring (5) from the mounting flange (6).
(8) Put a CAP - BLANKING on the mounting flange (6) and the crossfeed valve actuator (3).

[Rev.10 from 2021] 2026.04.02 07:02:56 UTC