Deactivation of the Transfer Defuel Valve

TASK 28-25-00-040-004-A
Deactivation of the Transfer Defuel 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.

ZONE: 148
ZONE: 744
FIN: 11QM
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	YES	YES	1.0	1.0	1

1. Reason for the Job
MMEL 28-25-04A
TRANSFER DEFUEL VALVE
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	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	BAG - POLYTHENE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
T720456	1	TOOL - VALVE LOCKING

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
148	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
744	MAIN DOOR
622KB
192MB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-53-000-001-A	Removal of the Center-Tank Defuel/Transfer Valve-Actuator
TASK 28-25-53-400-001-A	Installation of the Center-Tank Defuel/Transfer Valve-Actuator
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
Refuel/Defuel Control Panel ** ON A/C NOT FOR ALL
Transfer Defuel Valve (11QM) - Location and Detail
Refuel/Defuel Control Panel ** ON A/C NOT FOR ALL
Refuel/Defuel Control Panel ** ON A/C NOT FOR ALL
Refuel/Defuel Control Panels 800VU and 801VU ** ON A/C NOT FOR ALL
Refuel/Defuel Control Panel ** ON A/C NOT FOR ALL
Refuel/Defuel Control Panels 800VU and 801VU ** ON A/C NOT FOR ALL
Refuel/Defuel Control Panels 800VU and 801VU ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-25-00-941-072-A

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) You must obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-25-00-010-072-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the right Main Landing Gear (MLG) door (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE below the transfer defuel valve (11QM).
(3) Open access panel 192MB.
(a) If operating in battery power, do not keep the door open longer than necessary because the battery can discharge.

Subtask 28-25-00-010-072-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the right Main Landing Gear (MLG) door (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE below the transfer defuel valve (11QM).
(3) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below access panel 622KB.
(4) Open access panel 622KB.
(a) If operating in battery power, do not keep the door open longer than necessary because the battery can discharge.

Subtask 28-25-00-860-054-A

C. Aircraft Maintenance Configuration
(1) On the panel 800VU, make sure that the MODE SELECT switch is in the OFF and guarded position.

Subtask 28-25-00-865-057-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L22

4. Procedure
Subtask 28-25-00-040-050-A

A. Transfer Defuel Valve - Closure Procedure
(1) If the actuator (11QU) shows the transfer defuel valve (11QM) in the open position (see/feel indicator in-line), do the steps that follow:
(a) Remove the actuator (11QU) from the drive shaft of the transfer defuel valve (11QM) (Ref. AMM TASK 28-25-53-000-001).
(b) Manually turn the drive shaft to the valve-closed position (indicator groove vertical).

NOTE: You can use a T720456 TOOL - VALVE LOCKING to confirm the position of the valve.

(c) Make sure that the actuator (11QU) shaft is in the correct position (see/feel indicator cross-line) to align with the valve drive shaft.
(d) If necessary, do the steps that follow:
1 Close the circuit breaker 1QU on the panel 121VU, and operate the actuator (11QU) to get the correct position.
2 Open the circuit breaker 1QU.
(e) Disconnect the electrical connector (1) from the actuator (11QU).
(f) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(g) Seal the disconnected cable in a BAG - POLYTHENE.
(h) Install the actuator (11QU) (Ref. AMM TASK 28-25-53-400-001) and do not connect the electrical connector (1) to the actuator.
(2) If the actuator (11QU) shows the transfer defuel valve (11QM) in the closed position (see/feel indicator cross-line), do the steps that follow:
(a) Disconnect the electrical connector (1) from the actuator (11QU).
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Seal the disconnected cable in a BAG - POLYTHENE.
(3) If the actuator (11QU) is unserviceable ,do the steps that follow:
(a) Disconnect the electrical connector (1) from the actuator (11QU).
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Seal the disconnected cable in the BAG - POLYTHENE.
(d) Remove the actuator (11QU) (Ref. AMM TASK 28-25-53-000-001).
(e) Put the actuator (11QU) in the BAG - POLYTHENE and keep in a safe location.

NOTE: Keep the V-band clamp (82QM) safe. You will need it to clamp the T720456 TOOL - VALVE LOCKING to the mounting flange of the valve drive shaft.

(f) Make sure that the transfer defuel valve (11QM) is in the closed position (indicator groove vertical).
(g) Install the T720456 TOOL - VALVE LOCKING onto the face plate of the drive shaft to lock the drive shaft so that it will not turn. Make sure that the dowel (3) is correctly installed between the T720456 TOOL - VALVE LOCKING and the face plate of the drive shaft. Put the V-band clamp (82QM) around the mounting flange of the drive shaft and the T720456 TOOL - VALVE LOCKING and tighten the screw (2).

NOTE: The dowel (3) will stop the T720456 TOOL - VALVE LOCKING from rotating on the face plate of the drive shaft.

(4) Write an applicable entry in the aircraft technical logbook.
(5) Put a WARNING NOTICE(S) (to tell persons that the transfer defuel valve (11QM) is deactivated) on:

The MODE SELECT switch on panel 800VU
Circuit breaker 1QU in the cockpit.

5. Close-up
Subtask 28-25-00-410-066-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access panel 192MB.
(3) Remove the access platform(s).
(4) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-25-00-410-066-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access panel 622KB.
(3) Remove the access platform(s).
(4) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-25-00-942-075-A

B. Removal of the Equipment
(1) Remove the SAFETY BARRIERS.
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:17:37 UTC