W DOC AIRBUS | AMM A320F

Installation of the Bleed-Air Precooler Exchanger

TASK 36-11-42-400-802-A
Installation of the Bleed-Air Precooler Exchanger

WARNING: BE CAREFUL WHEN YOU REMOVE OR INSTALL THIS EQUIPMENT. THIS EQUIPMENT IS HEAVY (MORE THAN 12 KG (26.5 lb)) AND CAN CAUSE INJURY AND/OR DAMAGE.
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 AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.
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.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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: 470
ZONE: 480
FIN: 7150HM1 ** ON A/C NOT FOR ALL
FIN: 7150HM2 ** ON A/C NOT FOR ALL
1. Reason for the Job
The weight of this equipment is approximately 41 kg (88 lb). Two persons are necessary to do this task.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific
1
CLOTH - PROTECTIVE
No specific
1
CRANE 100KG (220 LB)
No specific
1
FOIL - ALUMINUM
No specific
AR
PLUG - BLANKING
No specific
AR
WARNING NOTICE(S)
No specific
1
WATER - SOAPY SOLUTION
No specific
Torque wrench: range to between 0.78 and 0.56 m.daN (69.03 and 49.56 lbf.in ) T
No specific
Torque wrench: range to between 1.41 and 1.30 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 2.69 and 2.24 m.daN (19.84 and 16.52 lbf.ft ) T
No specific
Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ) T
98D27803000000
2
LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION
98L36103000000
1
RI PRECOOLER
 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
470
ENGINE 1 AFT PYLON
480
ENGINE 2 AFT PYLON
191DB
FOR [7150HM1] (EXCHANGER-BLEED AIR PRECOOL)
413CT, 413DT, 413ET
FOR [7150HM2] (EXCHANGER-BLEED AIR PRECOOL)
423CT, 423DT, 423ET
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
33
SEAL
AIPC 36-11-86-01-240
22
SEAL
AIPC 36-11-86-01-300
33
SEAL
AIPC 36-11-86-02-240
22
SEAL
AIPC 36-11-86-02-300
16
SEAL
AIPC 36-11-86-02-310
17
SEAL
AIPC 36-11-86-02-310
27
SEAL
AIPC 36-11-86-02-360
30
SEAL
AIPC 36-11-86-02-360
29
SEAL
AIPC 36-11-86-02-370
26
SEAL
AIPC 36-11-86-02-380
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 20-23-22-910-001-A
Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 20-28-00-912-802-A
Electrical Bonding - General Maintenance Procedure
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 27-00-00-480-002-A
Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 36-12-00-860-802-A
Pressurization of the Bleed System with the APU
TASK 36-12-00-860-803-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 54-52-22-300-801-A
Replacement of the Upper Seals of the Bleed-Air Precooler Exchanger
TASK 71-00-00-860-833-A
Procedure to Prevent Engine Motoring
F Bleed-Air Precooler Exchanger
F Precooler Exchanger Tool
F Half Seal Guillotine and Rib
F Upper Seal of the Bleed-Air Precooler Exchanger
FOR [7150HM1] (EXCHANGER-BLEED AIR PRECOOL)
TASK 54-52-11-000-805-A
Removal of the Access Skin Panels
TASK 54-52-11-400-805-A
Installation of the Access Skin Panels
FOR [7150HM2] (EXCHANGER-BLEED AIR PRECOOL)
TASK 54-52-11-000-805-A
Removal of the Access Skin Panels
TASK 54-52-11-400-805-A
Installation of the Access Skin Panels
3. Job Set-up
Subtask 36-11-42-860-053-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) or (Ref. AMM TASK 24-41-00-861-002).
   (2) Make sure that an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position.
   (3) Make sure that these access panels are removed:
     (a) FOR [7150HM1] (EXCHANGER-BLEED AIR PRECOOL)
413CT, 413DT and 413ET (Ref. AMM TASK 54-52-11-000-805).
     (b) FOR [7150HM2] (EXCHANGER-BLEED AIR PRECOOL)
423CT, 423DT and 423ET (Ref. AMM TASK 54-52-11-000-805).
Subtask 36-11-42-865-058-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 BLEED/ENG 2/MONG3HA2D12
49VUAIR BLEED/ENG 1/CTL2HA1D11
122VUAIR BLEED/ENG 1/MONG3HA1Z23
122VUAIR BLEED/ENG 2/CTL2HA2Z22
Subtask 36-11-42-941-054-A ** ON A/C NOT FOR ALL
C. Safety Precautions
   (1) On AIR COND panel 30VU:
  • Make sure that the APU BLEED pushbutton switch is released (ON legend off).
  • Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
  • Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the pneumatic system.
   (2) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
   (3) On the access door 191DB, on the HP ground connectors:
  • Make sure that a WARNING NOTICE(S) is in position to tell persons not to pressurize the pneumatic system.
   (4) 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 (Ref. AMM TASK 27-00-00-480-002).
  • 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.
4. Procedure
Subtask 36-11-42-420-054-A ** ON A/C NOT FOR ALL
A. Preparation of the Bleed-Air Precooler Exchanger
   (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 a visual inspection of the seals (26), (27), (29) and (30):
   (4) Do a visual inspection of the seal (16) of the assembled rib and half-guillotine (6) and the seal (17) of the fairing support (15):
   (5) Remove the PLUG - BLANKING from the disconnected line end(s).
   (6) Remove the PLUG - BLANKING from the precooler exchanger (24).
   (7) Make sure that the parts retained from the removed component are clean and in the correct condition.
Subtask 36-11-42-420-055-A ** ON A/C NOT FOR ALL
B. Installation of the 98L36103000000 RI PRECOOLER Tool
F Precooler Exchanger Tool ** ON A/C NOT FOR ALL
   (1) Make sure that the tool is clean and is in the correct condition.
   (2) Attach the 98L36103000000 RI PRECOOLER tool to the CRANE 100KG (220 LB).
   (3) Put the CRANE 100KG (220 LB) in position with the 98L36103000000 RI PRECOOLER tool above the precooler exchanger (24).
   (4) Attach the 98L36103000000 RI PRECOOLER tool to the hoisting points of the precooler exchanger (24).
   (5) Obey the tool instructions to install the four links (44) on the precooler exchanger (24).
Subtask 36-11-42-420-056-A ** ON A/C NOT FOR ALL
C. Installation of the Bleed-Air Precooler Exchanger
CAUTION: WHEN YOU INSTALL THE FASTENERS OF THE PRECOOLER, DO NOT APPLY TOO MUCH FORCE. IF YOU DO NOT OBEY THIS PRECAUTION, YOU CAN CAUSE DAMAGE TO THE BRACKETS.
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the PLUG - BLANKING from the end(s) of the disconnected duct(s).
   (3) Carefully lift the 98L36103000000 RI PRECOOLER tool with the CRANE 100KG (220 LB) until it holds the weight of the precooler exchanger (24).
NOTE: The precooler exchanger (24) weighs 41.2 kg.
   (4) Install a new AIPC 36-11-86-01-240 SEAL (33)AIPC 36-11-86-02-240 SEAL (33) on the duct (31).
   (5) Put the precooler exchanger (24) in position on the supports (25).
NOTE: Make sure that you do not damage to the duct (31) when you put the precooler exchanger (24) in position on the supports (25).
     (a) Use the metal tubes (46) and (47) to install the precooler exchanger (24) in the correct position.
NOTE: The metal tubes (46) go into the guide rail (45).
   (6) Remove the 98L36103000000 RI PRECOOLER tool from the precooler exchanger (24).
   (7) Attach the precooler exchanger (24) to the supports (25).
CAUTION: MAKE SURE THAT YOU INSTALL THE BOLTS IN THE CORRECT SEQUENCE. IF YOU DO NOT OBEY THIS PRECAUTION, YOU CAN CAUSE DAMAGE TO THE SUPPORTS AND THE PRECOOLER EXCHANGER.
     (a) Make sure that the positions of the bolts (40), (42), (36) and (37) agree with the positions you recorded at the removal.
     (b) Install the washer (41) and bolt (40) on the precooler exchanger (24). Do not torque the bolt (40) at this time.
     (c) Install the washer (43) and bolt (42) on the precooler exchanger (24). Do not torque the bolt (42) at this time.
     (d) Install the washer (35) and bolt (36) on the precooler exchanger (24). Do not torque the bolt (36) at this time.
     (e) Install the washer (38) and bolt (37) on the precooler exchanger (24). Do not torque the bolt (37) at this time.
   (8) Do an electrical bonding of the precooler exchanger aft-right fixation (Ref. AMM TASK 20-28-00-912-802).
   (9) TORQUE the four bolts (40), (42), (36) and (37) to between 2.69 and 2.24 m.daN (19.84 and 16.52 lbf.ft ) T.
   (10) Identify the four tightened bolts (40), (42), (36) and (37) with a red line (Ref. AMM TASK 20-23-22-910-001).
   (11) Connect the duct (31).
     (a) Install the clamp (32) that attaches the precooler exchanger (24) to the duct (31).
     (b) Put the clamp nut (32) in the correct position for the best tool access.
     (c) TORQUE the nut on the clamp (32) to between 1.41 and 1.30 m.daN (124.78 and 115.04 lbf.in ) T.
     (d) Identify the tightened nut of the clamp (32) with a red line (Ref. AMM TASK 20-23-22-910-001).
   (12) Install the bellows (20).
     (a) Install a new AIPC 36-11-86-01-300 SEAL (22)AIPC 36-11-86-02-300 SEAL (22) on the bellows (20).
     (b) Put the bellows (20) in position on the precooler exchanger (24).
     (c) Install the clamps (18) and (21) on the bellows (20).
     (d) Put the clamp nuts (18) and (21) in the correct position for the best tool access, but not near to the OverHeat Detection System (OHDS) or environment.
     (e) TORQUE the nut on the clamp (21) to between 1.41 and 1.30 m.daN (124.78 and 115.04 lbf.in ) T.
     (f) TORQUE the nut on the clamp (18) to between 0.78 and 0.56 m.daN (69.03 and 49.56 lbf.in ) T.
     (g) Identify the tightened nuts of the clamps (18) and (21) with a red line (Ref. AMM TASK 20-23-22-910-001).
   (13) Connect the pipes (23), (39) and (34) to the precooler exchanger (24).
     (a) Loosen the nut of the pipe (39) connected to the pylon floor.
     (b) Connect the pipe (39) to the precooler exchanger (24).
     (c) TORQUE the nut of the pipes (23), (39) and (34) connected to the precooler to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ) T.
     (d) TORQUE the nut of the pipe (39) connected to the pylon floor to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ) T.
     (e) Identify the tightened union nuts of the pipes (23), (39) and (34) with a red line (Ref. AMM TASK 20-23-22-910-001).
Subtask 36-11-42-410-052-A ** ON A/C NOT FOR ALL
D. Installation of the Components
F Half Seal Guillotine and Rib ** ON A/C NOT FOR ALL
F Upper Seal of the Bleed-Air Precooler Exchanger ** ON A/C NOT FOR ALL
   (1) Install the rib and the half-seal guillotine assembly (6) as follows:
     (a) Put the rib and the half-seal guillotine assembly (6) in their correct position on the fairing support (15).
     (b) Put a CLOTH - PROTECTIVE on the upper spar over the precooler aft duct-flange.
NOTE: This is to make sure that the nuts do not go into the precooler if they fall.
     (c) Put the washers (13), the bolts (14) and the nuts (8) in their position and tighten them.
     (d) Put the washers (11), the bolts (12) and the nuts (9) in their position and tighten them.
     (e) Put the bolts (10) and the nuts (7) in their position and tighten them.
   (2) Install the upper seals (2), (3), (4) and (5) of the bleed-air precooler exchanger as follows:
     (a) Do a visual inspection of the upper seals of the bleed-air precooler exchanger.
     (b) Make sure that there are no:
  • Burned color
  • Cracks during the visual inspection
  • Cracks when you push/pull them
  • Silicone parts removed from the seals.
     (c) If you find these types of damage, replace all the upper seals (2), (3), (4) and (5) (Ref. AMM TASK 54-52-22-300-801).
Subtask 36-11-42-865-059-A ** ON A/C NOT FOR ALL
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR BLEED/ENG 2/MONG3HA2D12
49VUAIR BLEED/ENG 1/CTL2HA1D11
122VUAIR BLEED/ENG 1/MONG3HA1Z23
122VUAIR BLEED/ENG 2/CTL2HA2Z22
Subtask 36-11-42-710-050-A ** ON A/C NOT FOR ALL
F. Do this test:
   (1) Pressurize the bleed system through the HP ground connector (Ref. AMM TASK 36-12-00-860-803) or with the APU (Ref. AMM TASK 36-12-00-860-802).
   (2) On AIR COND panel 30VU, set the X-BLEED selector to OPEN.
   (3) If you pressurize the bleed system through the HP ground connector, the supplied pressure of 30 psi (2.07 bar) must be stable.
   (4) Make sure that there are no leaks at the junctions downstream and upstream of the precooler exchanger (24) and between the wing duct and the bellows (20).
NOTE: 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. This shows that the leaks are not important.
  • 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.
       3 Make the foil wrap as tight as possible on the tube but do not rip the 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.
       4 Attach the foil wrap at the two sides of the pneumatic joint with 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
       5 Do a leak check:
  • If there is a leak, the foil installed on the duct breaks or becomes too hot.
   (5) Install the thermal protection (19) on the duct (20).
5. Close-up
Subtask 36-11-42-860-054-A ** ON A/C NOT FOR ALL
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 these access panels:
     (a) FOR [7150HM1] (EXCHANGER-BLEED AIR PRECOOL)
413CT, 413DT and 413ET (Ref. AMM TASK 54-52-11-400-805).
     (b) FOR [7150HM2] (EXCHANGER-BLEED AIR PRECOOL)
423CT, 423DT and 423ET (Ref. AMM TASK 54-52-11-400-805).
   (4) Remove all the fixtures, tools, test and support equipment used during this procedure.
   (5) Remove the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION from the flap/slat control lever on panel 114VU.
   (6) Remove the access platform(s).
   (7) Remove the WARNING NOTICE(S).
   (8) 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 01:09:19 UTC
"Aviabrain" 2025