Installation of the Pressure Reducing Valve

TASK 38-41-43-400-001-A
Installation of the Pressure Reducing Valve

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	Torque wrench: range to between 22.86 and 15.49 lbf.ft (3.10 and 2.10 m.daN )

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 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 25-54-12-000-001-A	Removal of the Forward Cargo-Compartment Partition
TASK 25-54-12-400-001-A	Installation of the Forward Cargo-Compartment Partition
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 38-41-00-710-001-A	Operational Test of the Air Supply System (with ground air supply)
TASK 38-41-00-790-001-A	Leak Check of the Components in the Air Supply System
TASK 38-41-00-820-001-A	Adjustment of the Pressure Reducing and Relief Valve
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
TASK 52-30-00-860-003-A	Open the FWD or Aft Cargo-Compartment Door with the Hand Pump
TASK 52-30-00-860-004-A	Close 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 38-41-43-860-050-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 you release the pressure from the potable water system (Ref. AMM TASK 38-10-00-614-002).
(3) Make sure that the aft cargo-compartment door is open (Ref. AMM TASK 52-30-00-860-001) or (Ref. AMM TASK 52-30-00-860-003).
(4) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
(5) Make sure that CARGO COMPT LIGHT switch 8LU is set to ON.
(6) Make sure that partition 161DW is removed (Ref. AMM TASK 25-55-12-000-001).

Subtask 38-41-43-860-050-B ** 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 you release the pressure from the potable water system (Ref. AMM TASK 38-10-00-614-002).
(3) Make sure that the forward cargo-compartment door is open (Ref. AMM TASK 52-30-00-860-001) or (Ref. AMM TASK 52-30-00-860-003).
(4) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
(5) Make sure that CARGO COMPT LIGHT switch 6LU is set to ON.
(6) Make sure that partition 131PW is removed (Ref. AMM TASK 25-54-12-000-001).

Subtask 38-41-43-865-052-A

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

4. Procedure
Subtask 38-41-43-420-050-A

A. Installation of 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) Put pressure reducing valve 4200MM (4) in position.
(2) Remove the blanking plugs from the line ends.
(3) Install the washers (2) and the nuts (3).
(4) Connect the connections (1) and (5).
(5) TORQUE the connections (1) and (5) to between 22.86 and 15.49 lbf.ft (3.10 and 2.10 m.daN )

Subtask 38-41-43-865-053-A

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 38-41-43-613-050-A

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

Subtask 38-41-43-710-050-A

D. Test
(1) Do the leak test of the component (Ref. AMM TASK 38-41-00-790-001).
(2) Do the operational test of the potable water air system (Ref. AMM TASK 38-41-00-710-001).
(3) If necessary do the adjustment of the pressure reducing valve (Ref. AMM TASK 38-41-00-820-001).

5. Close-up
Subtask 38-41-43-410-050-A ** 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 partition 161DW (Ref. AMM TASK 25-55-12-400-001).
(3) Set CARGO COMPT LIGHT switch 8LU to OFF.
(4) Remove the access platform(s).
(5) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002) or (Ref. AMM TASK 52-30-00-860-004).

Subtask 38-41-43-410-050-B ** 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 partition 131PW (Ref. AMM TASK 25-54-12-400-001).
(3) Set CARGO COMPT LIGHT switch 6LU to OFF.
(4) Remove the access platform(s).
(5) Close the forward cargo-compartment door (Ref. AMM TASK 52-30-00-860-002) or (Ref. AMM TASK 52-30-00-860-004).

Subtask 38-41-43-862-050-A

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

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