Removal of the ACT Vent Valve

TASK 28-28-62-000-001-A
Removal of the ACT Vent Valve

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

ZONE: 152
FIN: 234QM ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
152	AFT CARGO COMPARTMENT
148AZ

C. 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 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-28-72-000-001-A	Removal of the ACT Vent-Valve Actuator
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
ACT Vent Valve

3. Job Set-up
Subtask 28-28-62-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the APU section of overhead panel 25VU, make sure that the APU/MASTER SW pushbutton switch is released (the ON legend is off).
(3) On the FUEL section of HYD/FUEL panel 40VU, make sure that all the L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(4) Put the 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 on overhead panel 20VU to tell persons not to operate the fire extinguishing system
On the Additional Center Tank (ACT) section of control panel 28VU to tell persons not to operate the fuel system.

(5) You must obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001) when you do work on the fuel system.
(6) Put the WARNING NOTICE(S) in position to tell persons not to operate the main gear doors.

Subtask 28-28-62-650-050-A ** ON A/C NOT FOR ALL

B. Defuel the center tank (Ref. AMM TASK 28-25-00-650-001).

Subtask 28-28-62-865-054-A ** ON A/C NOT FOR ALL

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

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 28-28-62-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the right Main Landing Gear (MLG) door (Ref. AMM TASK 32-12-00-010-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position at the right MLG door.

Subtask 28-28-62-020-050-A ** ON A/C NOT FOR ALL

E. Preparation for Removal
(1) Remove the ACT vent-valve actuator (Ref. AMM TASK 28-28-72-000-001).

Subtask 28-28-62-010-051-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Get access to the fuel center tank (Ref. AMM TASK 28-10-00-910-002).

Remove access cover 148AZ or/and the ACT-equipment support door (Ref. AMM TASK 57-17-11-000-001).

4. Procedure
Subtask 28-28-62-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Vent Valve

ACT Vent Valve ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 5 L (1.32 USGAL) below the connections between the vent valve (5) and the flanges (7) and (2).
(2) Remove the nut (23) and the screw (21) and disconnect the bonding strap (22) from the vent valve (5).
(3) Remove the nut (6) and the screw (9) and disconnect the bonding straps (10), (11) and (12) from the flange (7).
(4) Remove the nut (17) and the screw (19) and disconnect the bonding straps (12) and (18) from the vent valve (5).
(5) Remove the nut (3) and the screw (1) and disconnect the bonding strap (18) from the flange (2).
(6) Remove the nuts (13) and the screws (8) and disconnect the flange (7) from the vent valve (5).
(7) Remove the nuts (14) and the screws (20) and disconnect the flange (2) from the vent valve (5).
(8) Remove and discard the O-rings (4).
(9) Remove the nuts (16) from the studs (15).
(10) Remove the vent valve (5).

NOTE: The play at the connection between the flanges (7) and (2) will help you remove the vent valve (5).

(11) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.02 06:18:01 UTC