Deactivation of the ACT Transfer Valve in the Closed Position

TASK 28-28-00-040-020-A
Deactivation of the ACT Transfer Valve in the Closed Position

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
NO	NO	YES	0.8	0.8	1

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	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	TIE WRAP(S)
No specific	1	WARNING NOTICE(S)
T720456	1	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 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
ACT Fuel-Transfer Valve 165QM

3. Job Set-up
Subtask 28-28-00-860-224-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 HYD/FUEL 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 28-28-00-010-114-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 28-28-00-040-072-B ** ON A/C NOT FOR ALL

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.

A. Deactivation of the ACT Fuel-Transfer Valve in the Closed Position

NOTE: A refuel of the ACT is not possible while ACT fuel-transfer valve is OFF in valve position CLOSED.

(1) Disconnect the electrical connectors (3) and (4) from the receptacles of the ACT fuel-transfer valve-actuator (2).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Safety the electrical connectors (3) and (4) to the adjacent electrical harness with a TIE WRAP(S).
(4) Do a visual check of the indicator of the ACT fuel-transfer valve-actuator (2) to identify the position of the valve:

Indicator in horizontal position the transfer valve is OPEN
Indicator in vertical position the transfer valve is CLOSED.

(5) Cut and discard the lockwire:

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(a) Cut and discard the lockwire from the screw (5).
(6) Loosen the screw (5) and remove the V-clamp (6) and the ACT fuel-transfer valve-actuator (2).
(7) Remove the O-ring (7) and discard it:
(a) Turn the shaft of the ACT fuel-transfer valve (1) to the closed position if necessary.
(b) Install the T720456 TOOL - VALVE LOCKING on the flange of the ACT fuel-transfer valve (1) to lock it in the closed position.

5. Close-up
Subtask 28-28-00-860-225-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) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the access platform(s).
(4) Close the main gear doors (Ref. AMM TASK 32-12-00-410-001).
(5) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(6) Remove the WARNING NOTICE(S).
(7) In the cockpit put a placard in position to tell the crew that the ACT fuel- transfer valve is OFF in valve position CLOSED.
(8) On the refuel/defuel control panel 801VU put a placard in position to tell the ground crew: DO NOT REFUEL THE ACT(s).
(9) Make an entry in the logbook.

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