W DOC AIRBUS | AMM A320F

Installation of the Pressure Reducer

TASK 26-23-18-400-001-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: 130
FIN: 5014WM ** ON A/C NOT FOR ALL
FIN: 5015WM ** 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
130
FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
132MW, 825
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
5
O-RING
AIPC 26-23-02-03-200
2
TAB WASHER
AIPC 26-23-02-04-070
 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 25-54-12-000-003-A
Removal of the Sidewall Panels in the Forward Cargo Compartment
TASK 25-54-12-400-003-A
Installation of the Sidewall Panels in the Forward Cargo Compartment
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 (5014WM, 5015WM) ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 26-23-18-010-051-A ** ON A/C NOT FOR ALL
A. Get Access
   (1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001)
   (2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below the forward cargo-compartment door 825.
   (3) Make sure that the forward cargo-compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
   (4) Make sure that the CARGO COMPT LIGHT switch 6LU is in the ON position.
   (5) Make sure that the protection panel 132MW is removed (Ref. AMM TASK 25-54-12-000-003).
Subtask 26-23-18-865-053-A ** ON A/C NOT FOR ALL
B. 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/BTL28WXC05
49VUAIR COND/CARGO/FIRE/EXTIG/BTL11WXC04
** ON A/C NOT FOR ALL
49VUAIR COND/CARGO FIRE/EXTIG/BTL28WXC04
49VUAIR COND/CARGO/FIRE/EXTIG/BTL11WXC03
** ON A/C NOT FOR ALL
122VUAIR COND/CARGO/FIRE/EXTIG1WXT19
4. Procedure
Subtask 26-23-18-720-051-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 timebefore this functional test, it is not necessary to test it again.
     (a) Send the pressure reducer to the workshop.
Subtask 26-23-18-420-051-A ** ON A/C NOT FOR ALL
B. Installation of the Pressure Reducer
NOTE: The installation procedure is the same for the pressure reducers 5014WM and 5015WM.
   (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 as follows:
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 26-23-02-04-070 TAB 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 26-23-02-03-200 O-RING (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 26-23-18-210-052-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 26-23-18-865-054-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/BTL28WXC05
49VUAIR COND/CARGO/FIRE/EXTIG/BTL11WXC04
** ON A/C NOT FOR ALL
49VUAIR COND/CARGO FIRE/EXTIG/BTL28WXC04
49VUAIR COND/CARGO/FIRE/EXTIG/BTL11WXC03
** ON A/C NOT FOR ALL
122VUAIR COND/CARGO/FIRE/EXTIG1WXT19
Subtask 26-23-18-410-051-A ** 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 protection panel 132MW (Ref. AMM TASK 25-54-12-400-003).
   (3) In the forward cargo-compartment, set the CARGO COMPT LIGHT switch 6LU to OFF.
   (4) Close the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
   (5) Remove the access platform(s).
Subtask 26-23-18-860-053-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] 2026.04.01 06:44:55 UTC
"Aviabrain" 2025