Removal of the Pressure Reducing Valve

TASK 38-41-43-000-001-A
Removal of the Pressure Reducing 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: 4200MM

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
Pressure Reducing Valve 4200MM. ** ON A/C NOT FOR ALL
Pressure Reducing Valve 4200MM ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 38-41-43-861-050-A

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

Subtask 38-41-43-614-050-A

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

Subtask 38-41-43-865-051-A

C. 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 38-41-43-010-050-A ** ON A/C NOT FOR ALL

D. 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 38-41-43-010-050-B ** ON A/C NOT FOR ALL

D. 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 38-41-43-020-050-A

A. Removal of the Pressure Reducing Valve 4200MM

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

(1) Disconnect the pipes (1) and (5).
(2) Put the PLUG-BLANKING in each disconnected line end.
(3) Remove the nuts (3) and the washers (2).
(4) Remove the pressure reducing valve 4200MM (4).

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