Installation of the Center-Tank Defuel/Transfer Valve-Actuator

TASK 28-25-53-400-001-A
Installation of the Center-Tank Defuel/Transfer Valve-Actuator

FIN: 11QU

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)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.143 and 0.117 m.daN (12.65 and 10.35 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03KGB1)	Fluorosilicone base Grease-- PTFE Thickened High Temp. -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	0-RING	AIPC 28-25-03-02-130
2	O-RING	AIPC 28-25-83-02-140

D. 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
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
Transfer Defuel-Valve Actuator - Center Tank.

3. Job Set-up
Subtask 28-25-53-860-052-A

A. Aircraft Maintenance Configuration
(1) On the refuel/defuel control panel 800VU, make sure that:

the MODE SELECT switch is set to OFF,
the OPEN warning light is off.

(2) Make sure that the WARNING NOTICE(S) is in position on the refuel/defuel control panel 800VU to tell persons not to operate the refuel/defuel system.
(3) Make sure that the MLG doors are open (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the access door 192MB is open.
(5) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the MLG door.

Subtask 28-25-53-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L23
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L22

4. Procedure
Subtask 28-25-53-210-051-A

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the mounting flange (1) and from the defuel/transfer valve-actuator (5).
(4) Make sure that the defuel/transfer valve actuator (5) is in this configuration:

the see-feel indicator (4) is in-line with the step (valve open).

NOTE: The drive key (7) and the indicator groove (8) of the drive spindle are 90 deg. inverted to the see-feel indicator (4).

Subtask 28-25-53-420-053-A

B. Installation of the Defuel/Transfer Valve-Actuator (11QU)
(1) Put a new AIPC 28-25-03-02-130 0-RING (2) or AIPC 28-25-83-02-140 O-RING (2) with a thin layer of Fluorosilicone base Grease-- PTFE Thickened High Temp. - (Material No.03KGB1) on the mounting flange (1).
(2) Make sure that the defuel/transfer valve actuator (5) and the drive spindle (8) stay in the correct configuration.
(3) Connect the drive key (7) into the drive spindle (8).
(4) Turn the defuel/transfer valve actuator (5) clockwise until the dowel in the flange of the actuator engages with the slot on the mounting flange (1).
(5) Install the V-clamp (3).

CAUTION: DO NOT TORQUE THE V-CLAMP(S) TO MORE THAN THE SPECIFIED VALUE. THIS CAN CAUSE DAMAGE TO THE FLANGE SURFACES.

(6) TORQUE the screw

TORQUE the screw to between 0.143 and 0.117 m.daN (12.65 and 10.35 lbf.in ) .

(7) Remove the blanking caps from the electrical connectors.
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Connect the electrical connector (6) to the defuel/transfer valve actuator (5).

Subtask 28-25-53-860-051-A

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

Subtask 28-25-53-865-053-A

D. 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/SPLY	2QU	L24
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L23
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L22

Subtask 28-25-53-710-051-A

E. Test.

ACTION	RESULT
1.On the refuel/defuel control panel 800VU: set the guarded switch MODE SELECT 3QU to the DEFUEL XFR position.	On the refuel/defuel control panel 800VU: the annunciator OPEN 21QU comes on when the transfer/defuel valve is open.
2.On the refuel/defuel control panel 800VU: set the switch MODE SELECT 3QU to the OFF position.	On the refuel/defuel control panel 800VU: the annunciator OPEN 21QU goes off when the transfer/defuel valve is closed.

5. Close-up
Subtask 28-25-53-410-054-A

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

Subtask 28-25-53-860-050-A

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

[Rev.10 from 2021] 2026.04.02 07:03:12 UTC