Installation of the Defuel/Transfer Valve - Drive Assembly

TASK 28-25-43-400-002-A
Installation of the Defuel/Transfer Valve - Drive Assembly

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

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.

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	Torque wrench: range to between 0.13 and 0.11 m.daN (11.50 and 9.73 lbf.in )

B. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 28-25-00-710-002-A	Operational Test of the Defuel System
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
Defuel/Transfer Valve Drive Assembly

3. Job Set-up
Subtask 28-25-43-941-053-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) Make sure that the safety barriers are in position.

Subtask 28-25-43-860-052-A ** ON A/C NOT FOR ALL

B. 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 valve actuator 11QU is removed (Ref. AMM TASK 28-25-53-000-001).

Subtask 28-25-43-010-053-A ** ON A/C NOT FOR ALL

C. Get access to the avionics compartment.
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below the main door of the right main gear.
(2) Make sure that the main door of the right main gear (Ref. AMM TASK 32-12-00-010-001) is open.

4. Procedure
Subtask 28-25-43-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Defuel/Transfer Valve (11QM) - Drive Assembly
(1) Remove the PLUG - BLANKING from the hole openings of the fuel tank.
(2) Hold the drive assembly (3) in position and install the bonding lead (2) and the nuts (1).
(3) TORQUE the nuts (1) to between 0.13 and 0.11 m.daN (11.50 and 9.73 lbf.in )

.
(4) Do the electrical bonding of the bonding lead (2) (Ref. AMM TASK 20-28-00-912-802).
(5) Install the valve actuator (11QU) (Ref. AMM TASK 28-25-53-400-001).

Subtask 28-25-43-710-051-A ** ON A/C NOT FOR ALL

B. Do the operational test of the defuel system (Ref. AMM TASK 28-25-00-710-002).

5. Close-up
Subtask 28-25-43-942-052-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.02 07:03:17 UTC