W DOC AIRBUS | AMM A320F

Installation of the Buffer Air Heat Exchanger [PW11]

TASK 75-26-01-400-801-A
Installation of the Buffer Air Heat Exchanger

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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 400
FIN: 4100JM ** 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
1
ACCESS PLATFORM 1M(3 FT)
No specific
AR
COVER - PROTECTION
No specific
1
MALLET - SOFT FACE
No specific
Torque wrench: range to between 44 and 38 lbf.in (0.50 and 0.43 m.daN ) T
No specific
Torque wrench: range to between 85 and 70 lbf.in (0.96 and 0.79 m.daN ) T
No specific
Torque wrench: range to between 100 and 90 lbf.in (1.13 and 1.02 m.daN ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.P03-001)
lubricant, aircraft turbine engine
(Material No.P05-395)
beeswax
(Material No.P06-054)
Antigalling Compound
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
26
GASKET
EIPC 75-26-01-01-050
30
GASKET
EIPC 75-26-01-01-060
29
GASKET
EIPC 75-26-01-01-070
40
GASKET
EIPC 75-26-01-01-090
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 71-00-00-720-811-A
Test No. 3A - Idle Power Test
TASK 71-00-00-860-833-A
Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A
Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A
Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A
Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A
Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A
Closing of the Thrust Reverser Cowl-Doors
F Buffer Air Heat Exchanger
3. Job Set-up
Subtask 75-26-01-941-051-A ** ON A/C NOT FOR ALL
A. Safety Precautions
   (1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
Subtask 75-26-01-010-052-A ** ON A/C NOT FOR ALL
B. Get Access
   (1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
   (2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
Subtask 75-26-01-040-051-A ** ON A/C NOT FOR ALL
C. Deactivation of the Thrust Reverser System for Maintenance
WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
   (1) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).
Subtask 75-26-01-010-053-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Make sure that the left thrust reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
4. Procedure
CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 75-26-01-420-050-A ** ON A/C NOT FOR ALL
A. Installation of the Buffer Air Heat Exchanger
   (1) Removal of the protection covers
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
     (a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
   (2) If necessary, install the bracket (2) as follows:
See Sheet 1 of the figure:
F Buffer Air Heat Exchanger ** ON A/C NOT FOR ALL
     (a) Apply Antigalling Compound (Material No.P06-054) to the threads of the two bolts (1).
NOTE: For new or refurbished bolts or nuts with baked on lubricant, do not do the wet application.
     (b) Install the bracket (2) to the high pressure turbine bracket with bolts (1) finger-tight.
     (c) TORQUE the bolts (1) to between 100 and 90 lbf.in (1.13 and 1.02 m.daN ) T.
   (3) Install the buffer air heat exchanger (12) as follows:
See Sheet 2 and 3 of the figure:
F Buffer Air Heat Exchanger ** ON A/C NOT FOR ALL
     (a) Apply beeswax (Material No.P05-395) to the new EIPC 75-26-01-01-050 GASKET (26), the new EIPC 75-26-01-01-070 GASKET (29) and the new EIPC 75-26-01-01-060 GASKET (30).
     (b) Install the two gaskets (26) and (30) on the heat exchanger (12) grooves.
     (c) Install the gasket (29) and the metering plate (27) on the heat exchanger (12).
     (d) Apply the Antigalling Compound (Material No.P06-054) to the threads of the four bolts (14) and the two bolts (15).
NOTE: For new or refurbished bolts or nuts with baked-on lubricant, do not do the wet application.
     (e) Install the two bolts (14) and the pin (13) on the forward end of the heat exchanger (12) finger-tight.
     (f) Engage the heat exchanger (12) forward pin (13) to the forward bracket assembly.
     (g) Install the two bolts (15) that attach the heat exchanger (12) to the rear bracket assembly finger-tight.
     (h) Install the pin (13) on the heat exchanger (12) with the two bolts (14) and engage the center bracket assembly.
     (i) TORQUE the four bolts (14) and the two bolts (15) to between 100 and 90 lbf.in (1.13 and 1.02 m.daN ) T.
   (4) Install the manifolds (AP24) and (AP27) on the heat exchanger (12) as follows:
See Sheet 3 of the figure:
F Buffer Air Heat Exchanger ** ON A/C NOT FOR ALL
     (a) Apply Antigalling Compound (Material No.P06-054) to the threads of the six bolts (25).
See Sheet 3 of the figure:
F Buffer Air Heat Exchanger ** ON A/C NOT FOR ALL
NOTE: For new or refurbished bolts or nuts with baked-on lubricant, do not do the wet application.
     (b) Install the manifold (AP24) on the bracket and the heat exchanger (12) with the three bolts (25).
     (c) Install the manifold (AP27) on the heat exchanger with the three bolts (25).
     (d) TORQUE the six bolts (25) to between 100 and 90 lbf.in (1.13 and 1.02 m.daN ) T in small increments and until the same torque indication holds.
   (5) Install the tube (AD06) on the heat exchanger (12) as follows:
See Sheet 3 of the figure:
F Buffer Air Heat Exchanger ** ON A/C NOT FOR ALL
     (a) Apply P03-001lubricant, aircraft turbine engine to the threads of the coupling (28).
     (b) Connect the tube (AD06) to the heat exchanger (12) with the coupling (28).
     (c) TORQUE the coupling (28) to between 85 and 70 lbf.in (0.96 and 0.79 m.daN ) T.
     (d) Tap the coupling (28) with a MALLET - SOFT FACE.
     (e) TORQUE the coupling (28) again to between 85 and 70 lbf.in (0.96 and 0.79 m.daN ) T.
   (6) Install the tube (AD07) (42) on the heat exchanger (12) as follows:
See Sheet 4 of the figure:
F Buffer Air Heat Exchanger ** ON A/C NOT FOR ALL
     (a) Apply beeswax (Material No.P05-395) to a new EIPC 75-26-01-01-090 GASKET (40).
     (b) Install the gasket (40) to the heat exchanger (12).
     (c) Apply P03-001lubricant, aircraft turbine engine to the threads of the coupling (41).
     (d) Install the tube (AD07) (42) to the heat exchanger (12) with the coupling (41).
     (e) Apply Antigalling Compound (Material No.P06-054) to the threads of the two bolts (44).
NOTE: For new or refurbished bolts or nuts with baked on lubricant, do not do the wet application.
     (f) Attach the tube (AD07) (42) to the bracket with the clamp (43) and two bolts (44).
     (g) TORQUE the coupling (41) to between 85 and 70 lbf.in (0.96 and 0.79 m.daN ) T.
     (h) Tap the coupling (41) with a MALLET - SOFT FACE.
     (i) TORQUE the coupling (41) again to between 85 and 70 lbf.in (0.96 and 0.79 m.daN ) T.
     (j) TORQUE the two bolts (44) to between 44 and 38 lbf.in (0.50 and 0.43 m.daN ) T.
5. Close-up
Subtask 75-26-01-410-050-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the left thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
Subtask 75-26-01-440-050-A ** ON A/C NOT FOR ALL
B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 75-26-01-410-051-A ** ON A/C NOT FOR ALL
C. Close Access
   (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
   (2) Remove the access platform(s).
   (3) Remove the WARNING NOTICE(S).
Subtask 75-26-01-720-050-A ** ON A/C NOT FOR ALL
D. Test(s)
   (1) Do the test n°3 (Ref. AMM TASK 71-00-00-720-811)
[Rev.10 from 2021] 2026.04.01 03:13:12 UTC
"Aviabrain" 2025