Installation of the Check Valve

TASK 38-42-43-400-001-A
Installation of the Check Valve

FIN: 4206MM ** 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	Torque wrench: range to between 1.1 and 0.99 m.daN (97.35 and 87.61 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
161DW, 171AL

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	O-RING	AIPC 38-42-03-02-070

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-15-38-613-001-A	Fill the Potable Water Tank System (Aircraft Electrical Power Available)
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 25-55-12-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR65
TASK 25-55-12-400-001-A	Installation of the Aft Cargo-Compartment Partition at FR65
TASK 38-10-00-614-002-A	Depressurization of the Potable Water 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
Aft Check Valve

3. Job Set-up
Subtask 38-42-43-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002)
(2) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002).

Subtask 38-42-43-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	WATER SYS-AIR-COMPRESSOR	19MD	F01

Subtask 38-42-43-010-051-D ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position.
(2) Make sure that the aft cargo-compartment door is open (Ref. AMM TASK 52-30-00-860-001).
(3) Make sure that the access panel 161DW is removed from the aft cargo-compartment partition wall at FR65 (Ref. AMM TASK 25-55-12-000-001).

4. Procedure
Subtask 38-42-43-420-050-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) Make sure that the parts retained from the removed component are clean and in the correct condition.
(5) Put the new AIPC 38-42-03-02-070 O-RING (2) in position between the air filter (1) and the check valve (3).
(6) Install the check valve (3) on the air filter (1).

NOTE: On the check valve (3), make sure that the direction of the arrow points away from the air filter (1).

(7) Connect the line end of the pipe (4) to the check valve (3).
(8) TORQUE the line end of the pipe (4) to between 1.1 and 0.99 m.daN (97.35 and 87.61 lbf.in )

Subtask 38-42-43-865-052-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
2001VU	WATER SYS-AIR-COMPRESSOR	19MD	F01

Subtask 38-42-43-613-051-A ** ON A/C NOT FOR ALL

C. Fill the potable water system (Ref. AMM TASK 12-15-38-613-001).

Subtask 38-42-43-790-050-A ** ON A/C NOT FOR ALL

D. Leak Test
(1) Make sure that the water service panel 171AL is closed.
(2) Make sure that installed air compressor starts to pressurize the potable water system.

NOTE: The air compressor starts automatically after the closure of the water service panel.

(3) Make sure that the check valve (3) does not leak.
(4) Leaks are not permitted.

5. Close-up
Subtask 38-42-43-410-050-D ** 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) Install the access panel 161DW to the aft cargo-compartment partition wall at FR65 (Ref. AMM TASK 25-55-12-400-001).
(3) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 38-42-43-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:26:01 UTC