Removal of the Check Valve

TASK 38-41-41-000-001-A
Removal of the Check Valve

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

ZONE: 130
ZONE: 170
FIN: 4205MM

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) - ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
130	FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
170	AFT CAB U/FLOOR COMPT AFT BHD OF BULK
131PW
161DW

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 25-54-12-000-001-A	Removal of the Forward Cargo-Compartment Partition
TASK 25-55-12-000-001-A	Removal 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 52-30-00-860-003-A	Open the FWD or Aft Cargo-Compartment Door with the Hand Pump
Check Valve 4205MM. ** ON A/C NOT FOR ALL
Check Valve 4205MM ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-41-41-861-050-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 38-41-41-614-050-A

B. Depresurize the potable water system (Ref. AMM TASK 38-10-00-614-002).

Subtask 38-41-41-941-051-A

C. Safety Precautions
(1) Put warning notices in position to tell persons not to pressurize the potable water system.

Subtask 38-41-41-865-051-A

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

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

Subtask 38-41-41-010-050-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001) or (Ref. AMM TASK 52-30-00-860-003).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Set CARGO COMPT LIGHT switch 8LU to ON.
(4) Remove partition 161DW (Ref. AMM TASK 25-55-12-000-001).

Subtask 38-41-41-010-050-B ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the forward cargo-compartment door (Ref. AMM TASK 52-30-00-860-001) or (Ref. AMM TASK 52-30-00-860-003).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Set CARGO COMPT LIGHT switch 6LU to ON.
(4) Remove partition 131PW (Ref. AMM TASK 25-54-12-000-001).

4. Procedure
Subtask 38-41-41-020-050-A

A. Removal of the Check Valve

WARNING: MAKE SURE THAT THE WATER TANK IS DEPRESSURIZED.

WARNING: DO NOT TOUCH THE UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

(1) Loosen the unions (4) from the check valve (3) and the pressure reducing valve (6).
(2) Remove the tube assembly (5).
(3) Put the PLUG-BLANKING in each disconnected line end.
(4) Remove the check valve (3) from the air filter assembly (1).
(5) Remove the packing (2) and discard it.

[Rev.10 from 2021] 2026.04.02 06:26:00 UTC