Reactivation of the ACT Transfer Valve

TASK 28-28-00-440-020-A
Reactivation of the ACT Transfer Valve

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Reason for the Job
MMEL 28-07-01-05C
CENTER TANK FUEL QUANTITY INDICATION ON THE FUEL SD PAGE (FAA ONLY)
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	TIE WRAP(S)
No specific	1	WARNING NOTICE(S)
T720456	AR	TOOL - VALVE LOCKING

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-28-33-000-001-A	Removal of the ACT Fuel Transfer-Valve
TASK 28-28-33-400-001-A	Installation of the ACT Fuel Transfer-Valve
TASK 28-28-53-400-001-A	Installation of the ACT 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-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
TASK 57-17-11-400-001-B	Installation of Access Cover 148AZ or/and the ACT-Equipment Support-Door
TSM 28-28-00-810-804	Fuel - ACT Automatic Transfer Failure
TSM 28-28-00-810-841	Fuel - ACT Auto Transfer Fault - No Fuel Transfer From the ACT 1 When The Fuel In the ACT 2 Gets To Low Level, ACT 2 to 1 Change-over Fault In Auto Only
ACT Fuel-Transfer Valve 165QM

3. Job Set-up
Subtask 28-28-00-860-226-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures when you work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(3) On the APU section of overhead panel 25VU make sure that the APU/MASTER SW pushbutton switch is released (the ON legend is off).
(4) On the FUEL section of panel 40VU make sure that all tank pump pushbutton switches are released (the OFF legends are on).
(5) Put a WARNING NOTICE(S) in position:

On the APU section of overhead panel 25VU to tell persons not to operate the APU/MASTER SW pushbutton switch
On the FUEL section of panel 40VU to tell persons not to operate the fuel system
On the ENG/APU FIRE panel located on overhead panel 20VU to tell persons not to operate the fire extinguishing system
On the Additional Center Tank (ACT) control section of panel 28VU to tell persons not to operate the fuel system.

Subtask 28-28-00-010-115-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the left main-gear door for access (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 1M(3 FT) in position in the left MLG bay.
(3) Remove the ACT equipment-support door (Ref. AMM TASK 57-17-11-000-001).

4. Procedure
Subtask 28-28-00-440-070-B ** ON A/C NOT FOR ALL

A. Reactivation of the ACT Fuel-Transfer Valve

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(1) Remove the TIE WRAP(S) from the electrical connectors (3) and (4) and from the adjacent electrical harness.
(2) Remove the CAP-BLANKING from each electrical connector and receptacle.
(3) Remove the T720456 TOOL - VALVE LOCKING from the flange of the ACT fuel-transfer valve (1).
(4) Do an inspection of the component interfaces and the adjacent area.
(5) If the ACT fuel-transfer valve (1) had a failure in the closed position replace the ACT fuel-transfer valve (Ref. AMM TASK 28-28-33-000-001) (Ref. AMM TASK 28-28-33-400-001).
(6) If the ACT fuel-transfer valve-actuator (2) of the ACT fuel-transfer valve (1) is unserviceable, install a new ACT fuel-transfer valve-actuator (2) (Ref. AMM TASK 28-28-53-400-001).
(7) If you are not sure if the removed ACT fuel-transfer valve-actuator (2) is serviceable:

Install the removed ACT fuel-transfer valve-actuator (2) (Ref. AMM TASK 28-28-53-400-001)
Do the troubleshooting procedure of the ACT fuel-transfer valve (1) and the ACT fuel-transfer valve-actuator (2) TSM 28-28-00-810-804 TSM 28-28-00-810-841.

5. Close-up
Subtask 28-28-00-860-227-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Install the ACT equipment-support door (Ref. AMM TASK 57-17-11-400-001).
(2) Remove the WARNING NOTICE(S).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Remove the access platform(s).
(5) Close the main gear doors (Ref. AMM TASK 32-12-00-410-001).
(6) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:17:49 UTC