Installation of the Defuel/Transfer Valve

TASK 28-25-43-400-001-A
Installation of the Defuel/Transfer Valve

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 142
ZONE: 148
FIN: 11QM

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 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )
No specific	Torque wrench: range to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03JBA1)	Silicone base Grease-General Purpose - -
(Material No.06ABA1)	Polysulfide Sealant-Fuel Tank Brushable -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
142	WING CENTER BOX
148	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
148AZ

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
21	O-RING	AIPC 28-25-05-03-050
12	O-RINGS	AIPC 28-25-05-03-060
21	O-RING	AIPC 28-25-85-03-050
12	O-RINGS	AIPC 28-25-85-03-060

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-710-002-A	Operational Test of the Defuel System
TASK 28-25-43-400-002-A	Installation of the Defuel/Transfer Valve - Drive Assembly
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
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
TASK 57-17-11-400-001-A	Installation of Access Cover 147AZ(148AZ)
TASK 57-17-11-400-001-B	Installation of Access Cover 148AZ or/and the ACT-Equipment Support-Door
Defuel/Transfer Valve of Center Tank

3. Job Set-up
Subtask 28-25-43-860-050-A

A. Aircraft Maintenance Configuration

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) Make sure that the right wing and center tanks are defueled (Ref. AMM TASK 28-25-00-650-001).
(2) On the refuel/defuel control panel 800VU, make sure that:

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

(3) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below the main door of the right main gear.
(4) Make sure that the main door of the right main gear is open (Ref. AMM TASK 32-12-00-010-001).
(5) Make sure that the manhole cover 148AZ is removed (Ref. AMM TASK 57-17-11-000-001).
(6) Make sure that the valve actuator 11QU is removed (Ref. AMM TASK 28-25-53-000-001).

4. Procedure
Subtask 28-25-43-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Center Tank-Defuel/Transfer-Valve
(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Apply Turbine Fuel-- Kerosene - (Material No.01ABA1) on the new AIPC 28-25-05-03-060 O-RINGS (12) and AIPC 28-25-05-03-050 O-RING (21).
(3) Install the new O-ring (21) on the valve (20).
(4) Install the new O-rings (12) on the valve (20).
(5) Apply Silicone base Grease-General Purpose - - (Material No.03JBA1) on the shaft end of the valve (20).
(6) Apply Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) on the head of the screws (2).
(7) Install the valve (20) on the pipes (11) and (14) and then on the rear spar (1):
(a) The valve (20) must be in the closed position.
(8) Install the screws (2).
(9) TORQUE the screws (2) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(10) Attach the line (11) to the support (8) with the bolts (9) and the nuts (10).
(11) TORQUE the nuts (10) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(12) Attach the line (14) to the support (18) with the bolts (16) and the nuts (17).
(13) TORQUE the nuts (17) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(14) Hand Tighten the nuts (13).
(15) Connect the bonding strips (4) and (19) with the bolts (3), the washers (5) and the nuts (6).
(16) TORQUE the nuts (6) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(17) Install the valve actuator 11QU (Ref. AMM TASK 28-25-53-400-001).

Subtask 28-25-43-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Center Tank-Defuel/Transfer-Valve
(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Apply Turbine Fuel-- Kerosene - (Material No.01ABA1) on the new AIPC 28-25-05-03-050 O-RING (21) or AIPC 28-25-85-03-050 O-RING (21) and AIPC 28-25-05-03-060 O-RINGS (12) or AIPC 28-25-85-03-060 O-RINGS (12).
(3) Install the new O-ring (21) on the valve (20).
(4) Install the new O-rings (12) on the valve (20).
(5) Apply Silicone base Grease-General Purpose - - (Material No.03JBA1) on the shaft end of the valve (20).
(6) Apply Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) on the head of the screws (2).
(7) Install the valve (20) on the pipes (11) and (14) and then on the rear spar (1):
(a) The valve (20) must be in the closed position.
(8) Install the screws (2).
(9) TORQUE the screws (2) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(10) Install the drive assembly (Ref. AMM TASK 28-25-43-400-002).
(11) Attach the line (11) to the support (8) with the bolts (9) and the nuts (10).
(12) TORQUE the nuts (10) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(13) Attach the line (14) to the support (18) with the bolts (16) and the nuts (17).
(14) TORQUE the nuts (17) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(15) Hand Tighten the nuts (13).
(16) Connect the bonding strips (4) and (19) with the bolts (3), the washers (5) and the nuts (6).
(17) TORQUE the nuts (6) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(18) Install the valve actuator 11QU (Ref. AMM TASK 28-25-53-400-001).

Subtask 28-25-43-710-050-A

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

Subtask 28-25-43-790-050-A

C. Do a Check for Leakage
(1) Make sure that there is no leakage at the valve (20).
(2) Remove the container.

5. Close-up
Subtask 28-25-43-410-050-A

A. Close Access
(1) Make sure that there are no unwanted objects and materials, tools or other equipment in the center tank.
(2) Install the manhole cover 148AZ (Ref. AMM TASK 57-17-11-400-001).
(3) Close the main door of the right main gear (Ref. AMM TASK 32-12-00-410-001).
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Remove the access platform(s).

Subtask 28-25-43-650-051-A

B. Refuel the right wing and center tanks (Ref. AMM TASK 12-11-28-650-003).

[Rev.10 from 2021] 2026.04.02 06:17:40 UTC