Cleaning of the Fuel Tanks

TASK 28-11-00-100-001-A
Cleaning of the Fuel 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 4M (13 FT)-ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147AZ, 148AZ, 540AB, 540BB, 540CB, 540DB, 540EB, 540FB, 540GB, 540HB, 540JB, 540KB, 540LB, 540MB, 540NB, 540PB, 540QB, 540RB, 550AB, 550BB, 550CB, 550DB, 640AB, 640BB, 640CB, 640DB, 640EB, 640FB, 640GB, 640HB, 640JB, 640KB, 640LB, 640MB, 640NB, 640PB, 640QB, 640RB, 650AB, 650BB, 650CB, 650DB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 28-12-45-000-001-A	Removal of the Panel Assembly
TASK 28-12-45-400-002-A	Installation of the Panel Assembly
TASK 28-12-46-000-001-A	Removal of the Overpressure Protector Outlet
TASK 28-12-46-400-001-A	Installation of the Overpressure Protector Outlet
TASK 28-12-47-000-001-A	Removal of the NACA Vent Intake
TASK 28-12-47-400-001-A	Installation of the NACA Vent Intake
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 28-25-00-869-001-A	Fuel Transfer
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
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-000-002-A	Removal of the Access Panel
TASK 57-27-11-400-001-A	Installation of the Access Panel
TASK 57-27-11-400-002-A	Installation of the Access Panel

3. Job Set-up
Subtask 28-11-00-941-087-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 the fuel tanks.
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-11-00-650-114-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 28-11-00-010-074-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the applicable wing.
(2) Remove the applicable fuel-tank access panels (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-17-11-000-001), (Ref. AMM TASK 57-27-11-000-001), (Ref. AMM TASK 57-27-11-000-002), (Ref. AMM TASK 28-12-45-000-001), (Ref. AMM TASK 28-12-46-000-001) and (Ref. AMM TASK 28-12-47-000-001):

for the center tank 147AZ 148AZ
for the left wing remove, 540AB 540BB 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB 540RB 550AB 550BB 550CB 550DB
for the right wing remove, 640AB 640BB 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB 640RB 650AB 650BB 650CB 650DB.

Subtask 28-11-00-010-074-D ** ON A/C NOT FOR ALL

for the center tank: 148AZ
for the left wing: 540AB 540BB 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB 540RB 550AB 550BB 550CB 550DB
for the right wing: 640AB 640BB 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB 640RB 650AB 650BB 650CB 650DB.

4. Procedure
Subtask 28-11-00-160-053-A

A. Cleaning of the Fuel Tanks
(1) Examine the fuel tanks for contamination and debris. Look specially in the areas that follow:

the lowest point of each tank
below each fuel quantity probe
the outboard side of each wing rib
outboard of each clack valve
on the strainer mesh of each fuel pump.

(2) If necessary, use the most suitable method to remove the contamination and debris.

5. Close-up
Subtask 28-11-00-410-073-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable fuel-tank access panels (Ref. AMM TASK 57-27-11-400-001), (Ref. AMM TASK 57-17-11-400-001), (Ref. AMM TASK 57-27-11-400-002), (Ref. AMM TASK 28-12-45-400-002), (Ref. AMM TASK 28-12-46-400-001) and (Ref. AMM TASK 28-12-47-400-001):

for the center tank install, 147AZ 148AZ
for the left wing install, 540AB 540BB 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB 540RB 550AB 550BB 550CB 550DB
for the right wing install, 640AB 640BB 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB 640RB 650AB 650BB 650CB 650DB.

Subtask 28-11-00-410-073-D ** ON A/C NOT FOR ALL

for the center tank install, 147AZ 148AZ
for the left wing install, 540AB 540BB 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB 540RB 550AB 550BB 550CB 550DB
for the right wing install, 640AB 640BB 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB 640RB 650AB 650BB 650CB 650DB.

Subtask 28-11-00-650-115-A

B. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-11-00-942-093-A

C. Removal of Equipment
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Remove the safety barriers.
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:17:03 UTC