W DOC AIRBUS | AMM A320F

Installation of the Overpressure Valve

TASK 36-11-53-400-803-A
Installation of the Overpressure Valve

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.
WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
  • THE FLIGHT CONTROLS
  • THE FLIGHT CONTROL SURFACES
  • THE LANDING GEAR AND THE RELATED DOORS
  • COMPONENTS THAT MOVE.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.
CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.
ZONE: 413
ZONE: 423
FIN: 7115HM1
FIN: 7115HM2
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 4M (13 FT)-ADJUSTABLE
No specific
1
FOIL - ALUMINUM
No specific
AR
WARNING NOTICE(S)
No specific
1
WATER - SOAPY SOLUTION
No specific
Torque wrench: range to between 1.41 and 1.3 m.daN (124.78 and 115.04 lbf.in ) T
No specific
Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ) T
No specific
Torque wrench: range to between 1.75 and 1.64 m.daN (12.91 and 12.09 lbf.ft ) T
98D27803000000
1
LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION
98L12003001000
AR
HARNESS,SAFETY
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14QEB1)
Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
413
UPPER FWD PYLON
423
UPPER FWD PYLON
191DB
FOR [7115HM1] (VALVE-OVERPRESSURE, ENG 1)
413CT
FOR [7115HM2] (VALVE-OVERPRESSURE, ENG 2)
423CT
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
12
SEAL
AIPC 36-11-86-50-150
2
SEAL
AIPC 36-11-86-50-150
6
SEAL
AIPC 36-11-86-50-150
22
SPECIAL SEAL
AIPC 36-11-86-50-230
15
SEAL
AIPC 36-11-86-50-300
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 12-00-00-481-002-A
Installation of the Wingrip
TASK 20-23-22-910-001-A
Marking of the Unions after Application of Standard or Specific Tightening Torque
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 24-41-00-862-002-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 36-11-53-720-803-A
Functional Check of Overpressure Valve
TASK 36-11-53-720-803-A-01
Functional Test of the Overpressure Valve (OPV) with the Bleed Test Set P/N 99127B04 and the Bleed Test Kit P/N 99127-281
TASK 36-12-00-860-805-A
Pressurization of the Bleed System with the APU
TASK 36-12-00-860-806-A
Pressurization of the Bleed System through the HP Ground Connector
TASK 49-00-00-860-009-A
APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01
APU Shutdown by Batteries (131-9(A))
TASK 54-52-11-000-807-A
Removal of the Access Skin Panels
TASK 54-52-11-400-807-A
Installation of the Access Skin Panels
F Overpressure Valve
3. Job Set-up
Subtask 36-11-53-861-061-A
A. Energize the aircraft electrical circuits
   (1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
Subtask 36-11-53-941-062-A
B. Safety Precautions
   (1) On AIR COND panel 30VU:
     (a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
     (b) Make sure that the APU BLEED pushbutton switch is released (ON legend off).
     (c) Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the pneumatic system.
   (2) On the center pedestal, on ENG panel 115VU:
     (a) Make sure that the ENG/MODE selector switch is in the NORM position.
     (b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
     (c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:
  • The ENG/MODE selector switch, and
  • The ENG/MASTER 1(2) control switch.
   (3) On the ENG section of maintenance panel 50VU:
     (a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
     (b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).
   (4) On access door 191DB, on the HP ground connector:
     (a) Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize the pneumatic system.
   (5) On FLAPS panel 114VU:
  • Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is in position on the flap/slat control lever.
  • Make sure that the WARNING NOTICE(S) is in position on the flap/slat control lever to tell persons not to operate the flap/slat controls.
   (6) Put on and attach the 98L12003001000 HARNESS,SAFETY before you start work in the work area (Ref. AMM TASK 12-00-00-481-002).
Subtask 36-11-53-865-066-A
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUAIR BLEED/ENG 2/MONG3HA2D12
49VUAIR BLEED/ENG 1/CTL2HA1D11
122VUAIR BLEED/ENG 1/MONG3HA1Z23
122VUAIR BLEED/ENG 2/CTL2HA2Z22
Subtask 36-11-53-010-073-A
D. Get Access
   (1) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position at the pylon access panels.
   (2) Make sure that this access panel is removed (Ref. AMM TASK 54-52-11-000-807):
     (a) FOR [7115HM1] (VALVE-OVERPRESSURE, ENG 1)
413CT
     (b) FOR [7115HM2] (VALVE-OVERPRESSURE, ENG 2)
423CT
4. Procedure
Subtask 36-11-53-420-056-A
A. Installation of the Overpressure Valve
   (1) If you use the APU to energize the electrical circuits, stop the APU:
   (2) In the cockpit, on the SD bleed page:
     (a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.
WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
WARNING: DO NOT TOUCH THE UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).
   (3) Do an inspection of the component interfaces and the adjacent area.
   (4) Clean the component interfaces and the adjacent area.
   (5) Remove the PLUG - BLANKING from the overpressure valve (18) and the precooler exchanger (17).
   (6) Remove the PLUG-BLANKING from each disconnected line end.
   (7) Make sure that the parts retained from the removed component are clean and in the correct condition.
   (8) Install a new AIPC 36-11-86-50-300 SEAL (15) on the precooler exchanger (17).
   (9) Put the overpressure valve (18) in position:
     (a) Make sure that the flow direction arrow on the valve points to the precooler exchanger (17) direction.
     (b) Make sure that the alignment tab engages.
   (10) Install the clamp (14):
     (a) Use the clocking device (23) of the overpressure valve (18) to install the clamp (14) in the correct position. Do not tighten the clamp (14) at this time.
Subtask 36-11-53-420-057-A
B. Installation of the Bellows and the T-Duct
   (1) Do an inspection of the component interfaces and the adjacent area.
   (2) Clean the component interfaces and the adjacent area.
   (3) Remove the PLUG-BLANKING from each disconnected line end.
   (4) Make sure that the parts retained from the removed component are clean and in the correct condition.
   (5) Installation of the T-duct:
CAUTION: WHEN YOU INSTALL OR REMOVE THE T-DUCT, BE VERY CAREFUL NOT TO LET THE REMOVABLE PARTS FALL INTO THE BLEED DUCT. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EQUIPMENT CAN OCCUR.
     (a) Install a new AIPC 36-11-86-50-150 SEAL (12) in the T-duct (9) and a new AIPC 36-11-86-50-230 SPECIAL SEAL (22) in the ECS pipe (21).
     (b) Carefully install the two shims (19) in position.
     (c) Carefully put the T-duct (9) in position.
     (d) Install the couplings (13) and (20). Do not tighten the couplings (13) and (20) at this time.
     (e) Install the washer (7) and bolt (8) on the oblong hole in the right side. Do not tighten the bolt (8) at this time.
     (f) Install the bushing (11) and bolt (10). Do not tighten the bolt (10) at this time.
   (6) Installation of the bellows:
     (a) Install a new AIPC 36-11-86-50-150 SEAL (6) in the T-duct (9) and a new AIPC 36-11-86-50-150 SEAL (2) in the starter duct (1).
     (b) Put the bellows (4) in position.
     (c) Install the couplings (5) and (3). Do not tighten the couplings (5) and (3) at this time.
   (7) Make sure that the bellows (4), T-duct (9) and overpressure valve (18) are correctly assembled and aligned.
   (8) Make sure that the couplings (3), (5), (13) and (20) are installed in the same positions as recorded during the removal procedure.
   (9) TORQUE the couplings (3), (5) and (13), and clamp (14) to between 1.41 and 1.3 m.daN (124.78 and 115.04 lbf.in ) T.
   (10) TORQUE the coupling (20) to between 1.75 and 1.64 m.daN (12.91 and 12.09 lbf.ft ) T.
   (11) Tighten the bolts (8) and (10).
   (12) Identify the tightened union nuts of the couplings (3), (5), (13) and (20), and clamp (14) with a red line (Ref. AMM TASK 20-23-22-910-001).
   (13) Connect the sense line (16) to the precooler exchanger (17).
   (14) TORQUE the sense line (16) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ) T.
   (15) Identify the tightened union nut of the sense line (16) with a red line (Ref. AMM TASK 20-23-22-910-001).
Subtask 36-11-53-865-067-A
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUAIR BLEED/ENG 2/MONG3HA2D12
49VUAIR BLEED/ENG 1/CTL2HA1D11
122VUAIR BLEED/ENG 1/MONG3HA1Z23
122VUAIR BLEED/ENG 2/CTL2HA2Z22
Subtask 36-11-53-480-058-A
D. Prepare for the Leak Test on the Connections
   (1) There are two procedures to do a leak check at the connections of the bleed air ducts (duct joint, flexible connections).
     (a) Soap solution procedure.
  • Leaks are permitted if the WATER - SOAPY SOLUTION stays on the joint line with a continuous series of bubbles.
  • Leaks are not permitted if the air pressure (from the air source) blows the soap solution off the joint line and prevents a continuous series of bubbles.
     (b) Aluminum foil procedure.
NOTE: This procedure is recommended when you do a leak check with hot air.
       1 Wind the FOIL - ALUMINUM on the joint once.
       2 Twist tight the seam of the foil wrap.
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.
       3 Make the foil wrap as tight as possible on the tube but do not rip the wrap.
       4 Attach the foil wrap at the two sides of the pneumatic joint with 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
Subtask 36-11-53-790-050-A
E. Leak Test
   (1) Pressurize the bleed system through the HP ground connector (Ref. AMM TASK 36-12-00-860-806) or with the APU (Ref. AMM TASK 36-12-00-860-805).
     (a) Make sure that there are no leaks at:
  • The junction upstream of the precooler exchanger (17) and the overpressure valve (18)
  • The junction of the overpressure valve (18) and the T-duct (9)
  • The junction of the T-duct (9) and the bellows (4)
  • The junction of the T-duct (9) and the ECS duct (21)
  • The junction of the starter duct (1) and the bellows (4)
  • The junction of the sense line (16) and the precooler exchanger (17).
NOTE: There is a leak when the foil installed on the pneumatic connection breaks or when it is too hot.
   (2) Remove the materials used to do the leak test.
Subtask 36-11-53-720-083-A
F. Do a functional check of overpressure valve (Ref. AMM TASK 36-11-53-720-803).
5. Close-up
Subtask 36-11-53-410-066-A
A. Close Access
   (1) Put the aircraft back to its initial configuration.
   (2) Make sure that the work area is clean and clear of tools and other items.
   (3) Install the access panel (Ref. AMM TASK 54-52-11-400-807):
     (a) FOR [7115HM1] (VALVE-OVERPRESSURE, ENG 1)
413CT
     (b) FOR [7115HM2] (VALVE-OVERPRESSURE, ENG 2)
423CT
   (4) Remove all the fixtures, tools, test and support equipment used during this procedure.
   (5) Remove the access platform(s).
   (6) Remove the WARNING NOTICE(S).
Subtask 36-11-53-862-058-A
B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002) or (Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.01 01:13:21 UTC
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