ACT Vent Valve - Simulation Fully Open with Vent Valve Deactivated

TASK 28-28-00-860-802-A
ACT Vent Valve - Simulation Fully Open with Vent Valve Deactivated

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Reason for the Job
If the ACT Vent Valve was deactivated in valve position CLOSED and you must refuel the ACT(s).
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	BRIDGE-WIRE
No specific	AR	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)
T720456	AR	TOOL - VALVE LOCKING
T720521	AR	TOOL-VALVE LOCKING

B. Consumable Materials

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

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB

D. 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 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 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-28-00-040-007-A	Deactivation of the Vent Valve in the Closed Position
Connections ACT Vent-Valve

3. Job Set-up
Subtask 28-28-00-941-055-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(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 the 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 the HYD/FUEL panel 40VU, make sure that all TK PUMP pushbutton switches are released (the OFF legends are on).
(5) Put WARNING NOTICE(S) in position:

On the APU section of the overhead panel 25VU, to tell persons not to operate the APU/MASTER SW pushbutton switch,
On the FUEL section of the panel 40VU, to tell persons not to operate the fuel system.
On the ACT control section of the panel 28VU, to tell persons not to operate the fuel system.

(6) Make sure that the ACT vent valve is deactivated in valve CLOSED position (Ref. AMM TASK 28-28-00-040-007).

Subtask 28-28-00-865-175-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/ACT VENT VLV/MAN/SPLY	62QH	L21
121VU	FUEL/ACT VENT VLV/AUTO/SPLY	61QH	L20

Subtask 28-28-00-010-120-A ** ON A/C NOT FOR ALL

C. Get Access
(1) On the lower fuselage, open access door 195BB.
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 28-28-00-869-050-B ** ON A/C NOT FOR ALL

A. ACT Vent Valve - Simulation Fully Open

WARNING: USE 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.

(1) Remove the O-ring (2), cut and discard the lockwire from the screw (7).
(2) Loosen the screw (7) and remove the clamp (3).
(3) Remove the T720456 TOOL - VALVE LOCKING (5) from the flange of the ACT vent valve (1).
(4) Turn the shaft of the ACT vent valve (1) to valve OPEN position.
(5) Put the T720521 TOOL-VALVE LOCKING (5) in position on the flange of the ACT vent valve (1), to lock the ACT vent valve in OPEN position.
(6) Install the O-ring (2) on the slot.
(7) Install the clamp (3) on the flange of the ACT vent valve (1).
(8) Tighten the screw (7) to safety the T720521 TOOL-VALVE LOCKING (5) on the valve (1).

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.

(9) Safety the screw (7) with 14QFC1Wire-Locking Dia: 0.8 mm CRES -.
(10) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(11) On the line end of the electrical connector A:
(a) Remove the CAP - BLANKING from the electrical connector (4).
(b) Remove the BRIDGE-WIRE (shunt) from the electrical connector (4) between the pins B and E.
(c) Install the BRIDGE-WIRE (shunt) on the electrical connector (4) between the pins A and D.

NOTE: In this configuration, the installed bypass simulates the aircraft that the ACT vent valve is fully open.

NOTE: A second shunt is not necessary on the electrical connector B (6) of the ACT vent valve.

(12) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-42-00-861-001).

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

(13) Refuel the applicable ACT(s) with manual control (Ref. AMM TASK 12-11-28-650-004).
(14) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-42-00-862-001).
(15) On the line end of the electrical connector A:
(a) Remove the BRIDGE-WIRE (shunt) from the electrical connector (4) between pins A and D.
(b) Do an inspection of the component interfaces and the adjacent area.
(c) Make sure that all the electrical connections are clean and in the correct condition.
(d) Install the BRIDGE-WIRE (shunt) on the electrical connector (4) between pins B and E.
(e) Put a CAP - BLANKING on the disconnected electrical connector (4).
(f) Make sure that both electrical connectors (4) and (6) are correctly attached to the adjacent electrical harness.

(16) Remove the O-ring (2), cut and discard the lockwire from the screw (7).
(17) Loosen the screw (7) and remove the clamp (3).
(18) Remove the T720456 TOOL - VALVE LOCKING (5) from the flange of the ACT vent valve (1).
(19) Turn the shaft of the ACT Vent Valve (1) to valve CLOSED position.
(20) Put the T720456 TOOL - VALVE LOCKING (5) in position on the flange of the ACT Vent Valve (1) to lock the valve in CLOSED position.
(21) Install the O-ring (2) on the slot.
(22) Install the clamp (3) on the flange of the ACT vent valve (1).
(23) Tighten the screw (7) to safety the T720521 TOOL-VALVE LOCKING (5) on the valve (1).

(24) Safety the screw (7) with 14QFC1Wire-Locking Dia: 0.8 mm CRES -.
(25) Make sure that the ACT vent valve is correctly disconnected in valve CLOSED position (Ref. AMM TASK 28-28-00-040-007).

5. Close-up
Subtask 28-28-00-410-082-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 195BB.

Subtask 28-28-00-942-050-A ** ON A/C NOT FOR ALL

B. Removal of Equipment
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:17:54 UTC