Installation of the ACT Cabin Air Intake Check Valve

TASK 28-28-43-400-001-A
Installation of the ACT Cabin Air Intake Check Valve

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

WARNING: DO NOT GET YOUR CLOTHES SOAKED WITH FUEL.

WARNING: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

FIN: 179QM ** 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	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
151BC

C. Referenced Information

REFERENCE	DESIGNATION
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 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 25-55-11-400-002-A	Installation of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-28-00-710-004-A	Operational Test of the ACT Automatic Transfer System
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
ACT Cabin Air Intake Check Valve

3. Job Set-up
Subtask 28-28-43-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedure (Ref. AMM TASK 28-00-00-910-001).
(2) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(3) Make sure that a WARNING NOTICE(S) is in position on:

the refuel/defuel panel 801VU,
the fuel panel 40VU,
to tell persons not to operate the refuel/defuel system.

Subtask 28-28-43-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the aft cargo-compartment door is open (Ref. AMM TASK 52-30-00-860-001).
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the opening of the aft cargo-compartment.
(3) In the aft cargo-compartment, make sure that the ceiling panel 151BC is removed (Ref. AMM TASK 25-55-11-000-002).

Subtask 28-28-43-865-051-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ACT1/REFUEL & SPLY	33QU	L29
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
121VU	ACT XFR VALVE MAN CTL	30QH	N29
121VU	ACT1/CTL & SPLY	9QH	P29
121VU	ACT PUMP SUPPLY	25QH	Q29

4. Procedure
Subtask 28-28-43-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Check Valve
(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Put the check valve (4) in position.
(5) Install the union nut (3) on the check valve (4).
(6) Install the union nut (5) of the T-pipe section (6) on the check valve (4).
(7) If removed, install the test coupling (1) to the T-pipe section (6).

Subtask 28-28-43-865-052-A ** ON A/C NOT FOR ALL

B. 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	ACT1/REFUEL & SPLY	33QU	L29
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
121VU	ACT XFR VALVE MAN CTL	30QH	N29
121VU	ACT1/CTL & SPLY	9QH	P29
121VU	ACT PUMP SUPPLY	25QH	Q29

Subtask 28-28-43-710-050-A ** ON A/C NOT FOR ALL

C. Test
(1) Do the Operational Test of the ACT Automatic Transfer System (Ref. AMM TASK 28-28-00-710-004).

5. Close-up
Subtask 28-28-43-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) In the aft cargo-compartment, install the ceiling panel 151BC (Ref. AMM TASK 25-55-11-400-002).
(2) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).

Subtask 28-28-43-860-052-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) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(4) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:17:58 UTC