Removal of the ACT Air Shutoff Valve

TASK 28-28-36-000-002-A
Removal of the ACT Air Shutoff Valve

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

ZONE: 150
FIN: 233QM ** 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	1	ACCESS PLATFORM 2M (6 FT)
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
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
151BC, 826

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 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-28-56-000-002-A	Removal of the ACT Air Shutoff Valve Actuator
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
ACT Air Shutoff Valve

3. Job Set-up
Subtask 28-28-36-860-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(3) On refuel/defuel control panels 800VU and 801VU, on fuel control panel 40VU and on Additional Center Tank (ACT) control panel 28VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to operate the refuel/defuel system.

Subtask 28-28-36-865-053-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 AIR SOV/MAN/SPLY	64QH	J20
121VU	FUEL/ACT AIR SOV/AUTO/SPLY	63QH	J19
121VU	FUEL/ACT XFR VLV/MOT2	66QH	J18
121VU	FUEL/ACT XFR VLV/MOT1	65QH	J17
121VU	FUEL/HI/LVL/SPLY	1QJ	L24
121VU	FUEL/RFL/DFL/SPLY	2QU	L23
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L22
121VU	FUEL/ACT VENT VLV/MAN/SPLY	62QH	L21
121VU	FUEL/ACT VENT VLV/AUTO/SPLY	61QH	L20
121VU	FUEL/ACT/FUEL PUMP/SPLY	25QH	Q29

Subtask 28-28-36-010-052-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at aft cargo-compartment door 826.
(2) Open aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(3) Set CARGO COMPT LIGHT switch 8LU to the ON position.
(4) In the aft cargo-compartment, remove cargo ceiling panel 151BC (Ref. AMM TASK 25-55-11-000-002).
(5) Remove the actuator of the air shutoff valve (Ref. AMM TASK 28-28-56-000-002).

4. Procedure
Subtask 28-28-36-020-051-B ** ON A/C NOT FOR ALL

A. Removal of the Air Shutoff Valve

CAUTION: USE A SECOND WRENCH TO HOLD THE FITTINGS WHEN YOU LOOSEN/TIGHTEN THE TUBE COUPLING NUTS. THIS PREVENTS DAMAGE TO THE TUBES.

(1) Loosen the nuts (3) and (5) and disconnect the tubes (2) and (9).
(2) Put the PLUG-BLANKING in each disconnected line end.
(3) Remove the nuts (6) and the washers (7) from the bolts (4).
(4) Remove the air shutoff valve (1) from the bracket (8).

[Rev.10 from 2021] 2026.04.02 06:17:56 UTC