Reactivation of the Transfer Defuel Valve

TASK 28-25-00-440-002-A
Reactivation 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

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	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)

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 28-25-43-000-001-A	Removal of the Defuel/Transfer Valve
TASK 28-25-43-400-001-A	Installation of the Defuel/Transfer Valve
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 28-25-00-941-077-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 28-25-00-010-064-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 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 28-25-00-010-064-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 28-25-00-860-059-A

C. Aircraft Maintenance Configuration
(1) On the panel 800VU, make sure that the MODE SELECT switch is in the OFF and guarded position. Make sure that the warning notice is still attached to the switch.
(2) Make sure that the circuit breaker 1QU on panel 121VU, is still open, safetied and tagged. Make sure that the warning notice is still attached to the circuit breaker.

4. Procedure
Subtask 28-25-00-440-051-A

A. Reactivation of the Transfer Defuel Valve
(1) Remove the applicable item(s) from the polythene bag(s).
(2) Remove the blanking caps from the electrical connectors.
(3) If applicable, release the screw (2) and remove V-band clamp (82QM). Remove the T720456 TOOL - VALVE LOCKING from the transfer defuel valve (11QM).
(4) Make sure that you remove the dowel (3) from between the T720456 TOOL - VALVE LOCKING and the face plate of the drive shaft. Keep the dowel (3) safe with the T720456 TOOL - VALVE LOCKING.
(5) If the transfer defuel valve (11QM) is unserviceable, then replace it, (Ref. AMM TASK 28-25-43-000-001) and (Ref. AMM TASK 28-25-43-400-001).
(6) If the actuator (11QU) is unserviceable, then replace it, (Ref. AMM TASK 28-25-53-000-001) and (Ref. AMM TASK 28-25-53-400-001).

NOTE: It is possible that the actuator (11QU) is in a polythene bag.

(7) Reconnect the electrical connector (1) to the actuator (11QU).
(8) If you do not know the cause of the failure, trouble-shoot the system and do the corrective action (Ref. TSM Chapter 28).

Subtask 28-25-00-865-062-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 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

5. Close-up
Subtask 28-25-00-410-064-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Remove the WARNING NOTICE(S) from circuit breaker 1QU in the cockpit and the MODE SELECT switch on panel 800VU.
(2) Remove the access platform(s).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(5) Close access panel 192MB.

Subtask 28-25-00-410-064-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Remove the WARNING NOTICE(S) from circuit breaker 1QU in the cockpit and the MODE SELECT switch on panel 800VU.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the access platform(s).
(4) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(5) Close access panel 622KB.

Subtask 28-25-00-942-068-A

B. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(4) Write an entry in the aircraft technical log to say that the transfer/defuel valve is reactivated.

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