W DOC AIRBUS | AMM A320F

Removal of the Bleed-Air Precooler Exchanger

TASK 36-11-42-000-802-A
Removal 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.
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
CRANE 100KG (220 LB)
No specific
AR
PLUG - BLANKING
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
98D27803000000
1
LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION
98L12003001000
AR
HARNESS,SAFETY
98L36103000000
1
RI PRECOOLER
 B. 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
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 12-00-00-481-002-A
Installation of the Wingrip
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 27-00-00-480-002-A
Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
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 71-00-00-860-833-A
Procedure to Prevent Engine Motoring
F Upper Seal of the Bleed-Air Precooler Exchanger
F Half Seal Guillotine and Rib
F Bleed-Air Precooler Exchanger
F Precooler Exchanger Tool
FOR [7150HM1] (EXCHANGER-BLEED AIR PRECOOL)
TASK 54-52-11-000-805-A
Removal of the Access Skin Panels
FOR [7150HM2] (EXCHANGER-BLEED AIR PRECOOL)
TASK 54-52-11-000-805-A
Removal of the Access Skin Panels
3. Job Set-up
Subtask 36-11-42-860-052-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
Subtask 36-11-42-941-053-A ** ON A/C NOT FOR ALL
B. Safety Precautions
   (1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
   (2) 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).
  • Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
   (3) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
   (4) On the access door 191DB, on the HP ground connectors:
  • Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
   (5) Put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area (Ref. AMM TASK 12-00-00-481-002).
   (6) On FLAPS panel 114VU:
  • Put the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002) .
  • Put a WARNING NOTICE(S) on the flap/slat control lever to tell persons not to operate the flap/slat controls.
Subtask 36-11-42-865-057-A ** ON A/C NOT FOR ALL
C. Open, safety and tag 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 36-11-42-010-055-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position.
   (2) Remove these access panels:
     (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 36-11-42-010-056-A ** ON A/C NOT FOR ALL
E. Removal of the Components
F Upper Seal of the Bleed-Air Precooler Exchanger ** ON A/C NOT FOR ALL
F Half Seal Guillotine and Rib ** ON A/C NOT FOR ALL
   (1) Remove the upper seals of access panel 413DT or 423DT:
     (a) Remove the upper seals (2), (3), (4) and (5) of the access panel (1).
   (2) Remove the rib and half-seal guillotine assembly (6) as follows:
     (a) Remove the six nuts (9), bolts (12) and washers (11).
     (b) Remove the fourteen nuts (7) and bolts (10).
     (c) Remove the six nuts (8), bolts (14) and washers (13).
     (d) Remove the rib and half-seal guillotine assembly (6) from the fairing support (15).
4. Procedure
Subtask 36-11-42-020-053-A ** ON A/C NOT FOR ALL
A. Preparation of the Removal 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) Remove the thermal protection (19) from the bellows (20).
   (4) Disconnect the pipes (23), (39) and (34) from the precooler exchanger (24).
   (5) Record the position of the clamps (18) and (21) before the removal.
   (6) Loosen the nuts on the clamps (18) and (21).
     (a) Remove the clamps (18) and (21).
   (7) Remove the bellows (20) from the precooler exchanger (24) and discard the seal (22).
   (8) Loosen the nut on the clamp (32).
     (a) Remove the clamp (32).
   (9) Put a PLUG - BLANKING on the disconnected line end(s).
Subtask 36-11-42-480-050-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 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 36-11-42-020-054-A ** ON A/C NOT FOR ALL
C. Removal of the Bleed-Air Precooler Exchanger
   (1) Record the position of the bolts (36), (37), (40) and (42) before the removal.
     (a) Remove the bolt (36) and washer (35).
     (b) Remove the bolt (37) and washer (38).
     (c) Remove the bolt (40) and washer (41).
     (d) Remove the bolt (42) and washer (43).
   (2) Carefully lift the 98L36103000000 RI PRECOOLER tool with the crane until the crane holds the weight of the precooler exchanger (24).
NOTE: The precooler exchanger (24) weighs 41.2 kg.
   (3) Remove the precooler exchanger (24) from the pylon.
   (4) Discard the seal (33) from the precooler exchanger (24).
   (5) Remove the 98L36103000000 RI PRECOOLER tool from the precooler exchanger (24).
   (6) Make sure that the seals (26), (27), (29) and (30) stay on the inlet duct (28).
   (7) Put a PLUG - BLANKING on the disconnected line ends and on the precooler exchanger (24).
[Rev.10 from 2021] 2026.04.01 07:30:59 UTC
"Aviabrain" 2025