W DOC AIRBUS | AMM A320F

Installation of the Pressure Reducer

TASK 26-23-18-400-002-A
Installation of the Pressure Reducer

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 150
ZONE: 160
ZONE: 170
FIN: 5044WM ** ON A/C NOT FOR ALL
FIN: 5045WM ** 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
AR
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific
Torque wrench: range to between 3 and 2.5 m.daN (22.12 and 18.44 lbf.ft ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.03FAB1)
Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.14QFB1)
Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
150
AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
160
BULK CARGO COMPARTMENT AFT BULKHEAD OF AFT CARGO COMPARTMENT TO AFT BULKHEAD OF BULK CARGO COMPARTMENT
170
AFT CAB U/FLOOR COMPT AFT BHD OF BULK
161DW, 826
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
2
TAB WASHER
AIPC 26-23-04-08-230
5
ORING
AIPC 26-23-84-05-390
2
WASHER
AIPC 26-23-84-05-460
 E. 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 25-55-12-000-001-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 26-23-00-200-003-A
Remove the Pressure Reducer for in-shop Functional Check Including Check of Fire Extinguishing Lines for Leakage and Obstruction
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
F Pressure Reducer (5044WM, 5045WM)
3. Job Set-up
Subtask 26-23-18-860-052-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
Subtask 26-23-18-010-054-C ** ON A/C NOT FOR ALL
B. Get Access
   (1) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below the aft cargo-compartment door 826.
   (2) Make sure that the aft cargo-compartment door 826 is open (Ref. AMM TASK 52-30-00-860-001).
   (3) Make sure that the CARGO COMPT LIGHT switch 8LU is in the ON position.
   (4) Make sure that the partition panel 161DW is removed (Ref. AMM TASK 25-55-12-000-001).
Subtask 26-23-18-865-056-A ** ON A/C NOT FOR ALL
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR COND/CARGO FIRE/EXTIG/BTL28WXC04
49VUAIR COND/CARGO FIRE/EXTIG/BTL11WXC03
4. Procedure
Subtask 26-23-18-720-050-A ** ON A/C NOT FOR ALL
A. Functional Test of the Pressure Reducer
   (1) Before you install the pressure reducer the functional test must be done.
NOTE: If the pressure reducer was already tested in a short time before this functional test, it is not necessary to test it again.
     (a) Send the pressure reducer to the workshop.
Subtask 26-23-18-420-052-F ** ON A/C NOT FOR ALL
B. Installation of the Pressure Reducer
NOTE: The installation procedure is the same for the pressure reducers 5044WM and 5045WM.
   (1) Clean the component interfaces and the adjacent area.
   (2) Do an inspection of the component interfaces and the adjacent area.
   (3) Remove the blanking plugs from the disconnected line ends.
   (4) Remove the blanking plugs from the ports of the pressure reducer (4).
   (5) Apply grease:
CAUTION: APPLY A SMALL QUANTITY OF THE CORRECT GREASE TO THE MALE THREADS OF THE CONNECTIONS. THIS WILL PREVENT DAMAGE TO THE THREADS. MAKE SURE THAT GREASE DOES NOT GO INTO THE PIPES. GREASE IN THE PIPES CAN CAUSE A MALFUNCTION OF THE SYSTEM.
     (a) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the male threads of the pressure reducer (4).
   (6) Install the pressure reducer (4):
WARNING: MAKE SURE THAT YOU INSTALL THE PRESSURE REDUCER IN THE CORRECT DIRECTION OF FLOW (REFER TO THE ARROW ON THE PRESSURE REDUCER HOUSING). IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO EQUIPMENT AND A MALFUNCTION OF THE FIRE EXTINGUISHING SYSTEM CAN OCCUR.
     (a) Put the pressure reducer (4) in its installation position on the bracket (3).
     (b) Install the new AIPC 26-23-04-08-230 TAB WASHER (2) or AIPC 26-23-84-05-460 WASHER (2) and the nut (1).
     (c) TORQUE the nut (1) to between 3 and 2.5 m.daN (22.12 and 18.44 lbf.ft ) T.
     (d) Safety the nut (1) with the tab washer (2).
   (7) Install the new AIPC 26-23-84-05-390 ORING (5) on the unions (6).
   (8) Install the unions (6) on the pressure reducer (4) and tighten.
   (9) Connect the pipes (8) and tighten the nuts (7).
WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
   (10) Safety the unions (6) with lockwire 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
Subtask 26-23-18-210-053-A ** ON A/C NOT FOR ALL
C. Functional Check
   (1) Do a check of the pressure reducer in the flow metering device and check of the cargo-compartment fire-extinguishing distribution-piping for leakage and blockages (Ref. AMM TASK 26-23-00-200-003).
5. Close-up
Subtask 26-23-18-865-057-A ** ON A/C NOT FOR ALL
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR COND/CARGO FIRE/EXTIG/BTL28WXC04
49VUAIR COND/CARGO FIRE/EXTIG/BTL11WXC03
Subtask 26-23-18-410-052-C ** ON A/C NOT FOR ALL
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install the partition panel 161DW (Ref. AMM TASK 25-55-12-400-001).
   (3) Set the CARGO COMPT LIGHT switch 8LU to the OFF position.
   (4) Close the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).
   (5) Remove the access platform(s).
Subtask 26-23-18-862-050-A ** ON A/C NOT FOR ALL
C. Put the aircraft back to its initial configuration.
   (1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
[Rev.10 from 2021] 2026.03.31 23:46:14 UTC
"Aviabrain" 2025