Removal of the Refuel Diffuser Assembly - Wing Tanks

TASK 28-25-42-000-001-A
Removal of the Refuel Diffuser Assembly - Wing Tanks

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.

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 5M (16 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540JB, 540KB, 640JB, 640KB
540HB, 640HB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-000-001-A	Removal of the Fuel Pipes
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 57-27-11-000-002-A	Removal of the Access Panel
Refuel Diffuser Assembly - Wing Tanks ** ON A/C NOT FOR ALL
Refuel Diffuser Assembly - Wing Tanks ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-25-42-941-052-A

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the fuel safety procedures (Ref. AMM TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-25-42-650-050-A

B. Fuel Configuration
(1) Defuel the applicable fuel tank (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 28-25-42-865-050-A

C. Open, safety and tag 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 28-25-42-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position below the applicable zone 540 (640).
(2) Remove the applicable access panels 540JB 640JB, 540KB 640KB (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-000-002).
(3) Remove the pipe assembly (Ref. AMM TASK 28-00-00-000-001).

Subtask 28-25-42-010-050-B ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position below the applicable zone 540 (640).
(2) Remove the applicable access panel 540HB 640HB (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-000-002).

4. Procedure
Subtask 28-25-42-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Refuel Diffuser Assembly - Wing Tanks
(1) Remove the nut (3), the screw (1) and disconnect the bonding strip (2).
(2) Remove the bolts (4) and (7), the washers (6) and then the diffuser (8) from the connector.
(3) Remove and discard the O-ring (5).

Subtask 28-25-42-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Refuel Diffuser Assembly - Wing Tanks
(1) Remove the nut (7) and the bolt (1). Disconnect the bonding strap (8) from the diffuser (2).
(2) Remove the bolts (5) and the bolts (6). Remove the diffuser (2) from the pipe (4).
(3) Remove and discard the O-ring (3).

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