Low Level Detection System in Additional Center Tank(s) (If Installed) - Deactivation

TASK 28-40-00-040-011-A
Low Level Detection System in Additional Center Tank(s) (If Installed) - Deactivation

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.

1. Reason for the Job
Introduce maintenance procedure to check that there is no fuel in ACT 2.
This deactivation task is not related to an AFM-CDL/MMEL item.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
192MB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-004-A	Pressure Refuel with Manual Control
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-00-650-005-A	To Drain the Remaining Fuel from the ACT
TASK 28-25-00-869-001-A	Fuel Transfer

3. Job Set-up
Subtask 28-40-00-941-068-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) You must obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-40-00-010-061-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the access door 192MB.

Subtask 28-40-00-860-069-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Move the fuel from the ACT 2 into the center tank (Ref. AMM TASK 28-25-00-869-001).

NOTE: Act 2 will contain a small quantity of unusable fuel after:

the contents have been used in flight
the contents have been moved to the center tank when the aircraft is on the ground.

It is possible to collect this unusable fuel on the ground through the water drain valves. Typically, this drainable fuel will have a volume of approximately 14 l (3.6984 USgal).

(2) Drain the remaining fuel from the ACT 2 (Ref. AMM TASK 28-25-00-650-005).

4. Procedure
Subtask 28-40-00-040-083-A ** ON A/C NOT FOR ALL

A. Fuel Configuration
(1) On panel 801VU, lift the guard and put the ACT 2 REFUEL VALVE switch in the SHUT position.
(2) Refuel the other fuel tanks to the necessary quantity (Ref. AMM TASK 12-11-28-650-004).
(3) Repeat the procedure to drain the remaining fuel from the ACT 2 (Ref. AMM TASK 28-25-00-650-005) to make sure that the ACT 2 stays empty after refuel.

NOTE: The ACT 2 must not contain any fuel. It must stay empty after the other tanks have been refueled.

5. Close-up
Subtask 28-40-00-860-070-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Put a WARNING NOTICE(S) in position to tell the flight crew that the low level sensors in the ACT 2, are unserviceable.
(2) Make a note in the aircraft technical log:

that the ACT 2 is empty of fuel
the low level sensors in the ACT 2 are unserviceable.

Subtask 28-40-00-410-059-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On panel 801VU:

make sure that the ACT 2 REFUEL VALVE switch is in the SHUT position
attach a WARNING NOTICE(S) to the ACT 2 REFUEL VALVE switch. This is to tell personnel not to use the switch in the NORM or OPEN positions.

(3) Close the access door 192MB.

Subtask 28-40-00-942-066-A ** ON A/C NOT FOR ALL

C. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.9 from 2019] 2026.04.02 06:18:04 UTC