Deactivation of the FWD ACT's Isolation Valve in the Closed Position

TASK 28-28-00-040-005-A
Deactivation of the FWD ACT's Isolation Valve in the Closed Position

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

FIN: 236QM ** ON A/C NOT FOR ALL
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 28-28-16A
FORWARD ACT ISOLATION VALVE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	TIE WRAP(S)
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFC1)	Wire-Locking Dia: 0.8 mm CRES -

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-004-A	Pressure Refuel with Manual Control
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 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
ACT-FWD Isolation-Valve Actuator

3. Job Set-up
Subtask 28-28-00-860-112-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) Obey the fuel safety procedures when you do 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 the 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.

(6) Put a WARNING NOTICE(S) in position on the MLG doors to tell persons not to operate the doors.

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

B. Get Access
(1) Open the left MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) in position in the left MLG bay.

4. Procedure
Subtask 28-28-00-040-054-C ** ON A/C NOT FOR ALL

A. Forward-ACT Isolation Valve is OFF in the Closed Position

NOTE: The forward-ACT isolation valve can stay in the closed position if there is no fuel in the ACT FWD. In this case do the subsequent procedure.

(1) On refuel/defuel control panel 801VU, put the REFUEL VALVE selector switches of ACT AFT2 and ACT FWD to SHUT position.

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.

(2) Disconnect the electrical connectors (3) and (4) from the receptacle of the isolation valve actuator (2).
(3) On the line end of the electrical connector A, install a BRIDGE-WIRE (shunt) on the electrical connector (3) between the pins B and E.
(4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(5) Safety the electrical connectors (3) and (4) to the adjacent electrical harness with a TIE WRAP(S).
(6) Do a visual check of the see/feel indicator of the isolation valve actuator (2) to identify the position of the valve:

See/feel indicator in horizontal position: the isolation valve is OPEN
See/feel indicator in vertical position: the isolation valve is CLOSED.

(7) 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).
(8) Loosen the screw (5) and disconnect the V-clamp (6) from the V-flange of the forward isolation valve (1).
(9) Remove the O-ring (7) and discard it.
(10) Remove the isolation valve actuator (2) from the forward isolation valve (1).
(11) Manually turn the input pin of the forward isolation valve (1) to the closed position.
(12) Install the T720456 TOOL - VALVE LOCKING on the V-flange of the forward isolation valve (1) to lock it in the closed position.
(13) Install the V-clamp (6) on the shaft of the forward isolation valve (1).
(14) Tighten the screw (5) to safety the T720456 TOOL - VALVE LOCKING on the valve.

(15) Safety the screw (5) with 14QFC1Wire-Locking Dia: 0.8 mm CRES -.

5. Close-up
Subtask 28-28-00-860-113-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On refuel/defuel control panel 801VU, put a placard in position to tell the ground crew that the automatic refuel of the aircraft is not possible.

NOTE: On the refuel/defuel control panel 801VU, the AFMS FAULT light comes ON after AFMC power-up test.

(3) If you must refuel the aircraft, do the pressure refuel with manual control (Ref. AMM TASK 12-11-28-650-004).
(4) Close the left MLG door (Ref. AMM TASK 32-12-00-410-001).
(5) Remove the access platform(s).
(6) Remove the Warning Notice(s) from the cockpit and from the MLG door.
(7) Make an entry in the logbook.

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