Deactivation of the Vent Valve in the Closed Position

TASK 28-28-00-040-007-A
Deactivation of the Vent Valve in the Closed Position

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

ZONE: 195
FIN: 234QM ** ON A/C NOT FOR ALL
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	NO	YES	1.3	1.3	1

1. Reason for the Job
MMEL 28-28-06C
ACT VENT VALVE
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	1	BRIDGE-WIRE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	TIE WRAP(S)
No specific	AR	WARNING NOTICE(S)
T720456	1	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
195	HYDRAULIC COMPT AND FAIRINGS
195BB

D. 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 28-28-00-860-802-A	ACT Vent Valve - Simulation Fully Open with Vent Valve Deactivated
ACT Vent-Valve Actuator

3. Job Set-up
Subtask 28-28-00-860-114-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(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 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 to tell persons not to operate the main gear doors.

Subtask 28-28-00-865-087-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/ACT RFL/VLV/SPLY & CTL	43QU	J21
121VU	FUEL/ACT VENT VLV/MAN/SPLY	62QH	L21
121VU	FUEL/ACT VENT VLV/AUTO/SPLY	61QH	L20

Subtask 28-28-00-010-068-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 28-28-00-040-056-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. ACT Vent Valve is OFF in the closed position

NOTE: The ACT vent valve can stay in CLOSED position during the flight.

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

See/feel indicator aligned, the ACT vent valve is OPEN
See/feel indicator across, the ACT vent valve is CLOSED.

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.

(6) Cut and discard the lockwire from the screw (6).
(7) Loosen the screw (6) and remove the V-clamp (1) and the actuator (3) from the shaft (7) of the ACT vent valve.
(8) If necessary, turn the shaft (7) of the ACT vent valve to CLOSED position.
(9) Install the T720456 TOOL - VALVE LOCKING (2) on the flange of the ACT vent valve to lock the valve in CLOSED position.
(10) Install the V-clamp (1) on the shaft (7) of the ACT vent valve.
(11) Tighten the screw (6) to safety the T720456 TOOL - VALVE LOCKING (2) on the valve.

(12) Safety the screw (6) with 14QFC1Wire-Locking Dia: 0.8 mm CRES -.

5. Close-up
Subtask 28-28-00-865-088-A ** ON A/C NOT FOR ALL

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/ACT RFL/VLV/SPLY & CTL	43QU	J21
121VU	FUEL/ACT VENT VLV/MAN/SPLY	62QH	L21
121VU	FUEL/ACT VENT VLV/AUTO/SPLY	61QH	L20

Subtask 28-28-00-860-115-A ** ON A/C NOT FOR ALL

B. 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) If you must refuel the ACT(s) with deactivated vent valve, do the simulation task of ACT vent valve fully open (Ref. AMM TASK 28-28-00-860-802).

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

(3) On the lower fuselage, close access door 195BB.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).
(7) Make an entry in the logbook.

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