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

TASK 28-40-00-440-002-A
Low Level Detection System in Additional Center Tank(s) (If Installed) - Reactivation

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
This reactivation 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)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
192MB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-46-34-000-001-B	Removal of the Fuel-Level Sensing Control-Unit (FLSCU)
TASK 28-46-34-400-001-B	Installation of the Fuel-Level Sensing Control-Unit (FLSCU)

3. Job Set-up
Subtask 28-40-00-941-069-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 28-40-00-010-062-A ** ON A/C NOT FOR ALL

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

Subtask 28-40-00-860-071-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On panel 801VU:

remove the warning notice from the ACT 2 REFUEL VALVE switch
put the ACT 2 REFUEL VALVE switch in the NORM position and lower the guard.

4. Procedure
Subtask 28-40-00-440-051-A ** ON A/C NOT FOR ALL

A. Reactivation of the Fuel Level Sensing Control Unit.
(1) If the control unit (47QJ) is unserviceable, then replace it, (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001).
(2) If you do not know the cause of the failure, trouble-shoot the system and do the corrective action (Ref. TSM Chapter 28).

5. Close-up
Subtask 28-40-00-860-072-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make an entry in the aircraft technical log that the ACT 2 low level detection system is now serviceable.

Subtask 28-40-00-410-060-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 NORM and guarded position
(3) Close the access door 192MB.

Subtask 28-40-00-942-067-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