W DOC AIRBUS | AMM A320F

²nstallation of the LPC Buffer Air Valve [PW11]

TASK 75-26-02-400-801-A
²nstallation of the LPC Buffer Air Valve

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: 4101JM ** 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
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 80 and 75 lbf.in (0.90 and 0.85 m.daN ) T
No specific
Torque wrench: range to between 135 and 120 lbf.in (1.53 and 1.36 m.daN ) T
No specific
Torque wrench: range to between 225 and 200 lbf.in (2.54 and 2.26 m.daN ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.P03-001)
lubricant, aircraft turbine engine (synthetic base)
(Material No.P05-395)
beeswax
(Material No.P05-396)
paraffin wax blend
 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, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 462AR
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
7
GASKET
EIPC 75-26-02-01-080
5
SEAL
EIPC 75-26-02-01-090
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 71-00-00-720-811-A
Test No. 3A - Idle Power Test
TASK 71-00-00-860-832-A
Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
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 73-25-34-400-802-A
Installation of the Engine Interface Unit (EIU)
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 LPC Buffer Air Valve
F LPC Buffer Air Valve
3. Job Set-up
Subtask 75-26-02-941-051-A ** ON A/C NOT FOR ALL
A. Safety Precautions
   (1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832)
Subtask 75-26-02-010-052-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 75-26-02-040-051-A ** ON A/C NOT FOR ALL
C. Deactivation of the Thrust Reverser System for Ground 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 ground maintenance (Ref. AMM TASK 78-30-00-040-805).
Subtask 75-26-02-010-053-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR
4. Procedure
CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 75-26-02-420-050-A ** ON A/C NOT FOR ALL
A. Installation of the Low Pressure Compressor (LPC) Buffer Air Valve
   (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.

PRE SB C-75-00-0022A (Initial Design Configuration)

   (2) Install the LPC buffer air valve (3) on the tube (AP22), duct (AP32) and tube (AA25) as follows:
F LPC Buffer Air Valve ** ON A/C NOT FOR ALL
     (a) Install the new EIPC 75-26-02-01-080 GASKET (7) on the tube (AP22) with the paraffin wax blend (Material No.P05-396) or the beeswax (Material No.P05-395) .
     (b) Install the new EIPC 75-26-02-01-090 SEAL (5) on the duct (AP32) with the paraffin wax blend (Material No.P05-396) or the beeswax (Material No.P05-395) .
     (c) Apply the P03-001lubricant, aircraft turbine engine (synthetic base) to the threads of the three bolts (1).
     (d) Install the LPC buffer air valve (3) on the bracket and the tube (AP22) with the three bolts (1) and the three nuts (6).
     (e) Connect the tube (AA25) B-nut to the LPC buffer air valve (3).
     (f) Apply the P03-001lubricant, aircraft turbine engine (synthetic base) to the threads of the coupling (4).
     (g) Install the duct (AP32) on the LPC buffer air valve (3) with the coupling (4).
     (h) Attach the tube (AP22) to the bracket with the two bolts (2).
     (i) TORQUE the three nuts (6) to between 135 and 120 lbf.in (1.53 and 1.36 m.daN ) T.
   (3) Torque the B-nut:
CAUTION: USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE OR HOSE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES OR HOSES.
     (a) TORQUE the B-nut to between 225 and 200 lbf.in (2.54 and 2.26 m.daN ) T.
   (4) Torque the coupling:
     (a) TORQUE the coupling (4) to between 80 and 75 lbf.in (0.90 and 0.85 m.daN ) T.
     (b) Tap the coupling (4) with the MALLET - SOFT FACE.
     (c) TORQUE the coupling (4) again to between 80 and 75 lbf.in (0.90 and 0.85 m.daN ) T.
   (5) TORQUE the two bolts (2) to between 44 and 38 lbf.in (0.50 and 0.43 m.daN ) T.

END OF PRE SB C-75-00-0022A (Initial Design Configuration)

POST SB C-75-00-0022A (LPC Cabin Odor Configuration)

   (6) Install the LPC buffer air valve (3) on the tube (AP22) and the duct (AP32) as follows:
F LPC Buffer Air Valve ** ON A/C NOT FOR ALL
     (a) Install the new EIPC 75-26-02-01-080 GASKET (7) on the tube (AP22) with the paraffin wax blend (Material No.P05-396) or the beeswax (Material No.P05-395) .
     (b) Install the new EIPC 75-26-02-01-090 SEAL (5) on the duct (AP32) with the paraffin wax blend (Material No.P05-396) or the beeswax (Material No.P05-395) .
     (c) Apply the P03-001lubricant, aircraft turbine engine (synthetic base) to the threads of the three bolts (1).
     (d) Install the LPC buffer air valve (3) on the bracket and the tube (AP22) with the three bolts (1) and the three nuts (6).
     (e) Connect the tube (AA25) B-nut to the LPC buffer air valve (3) side port fingertight.
     (f) Connect the manifold (AA37) B-nut to the LPC buffer air valve (3) fingertight.
     (g) Apply the P03-001lubricant, aircraft turbine engine (synthetic base) to the threads of the coupling (4).
     (h) Install the duct (AP32) on the LPC buffer air valve (3) with the coupling (4).
     (i) Attach the tube (AP22) to the bracket with the two bolts (2).
     (j) TORQUE the three nuts (6) to between 135 and 120 lbf.in (1.53 and 1.36 m.daN ) T.
CAUTION: USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE OR HOSE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES OR HOSES.
     (k) TORQUE the tube (AA25) B-nut to between 225 and 200 lbf.in (2.54 and 2.26 m.daN ) T.
CAUTION: USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE OR HOSE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES OR HOSES.
     (l) TORQUE the manifold (AA37) B-nut to between 225 and 200 lbf.in (2.54 and 2.26 m.daN ) T.
     (m) TORQUE the coupling (4) to between 80 and 75 lbf.in (0.90 and 0.85 m.daN ) T.
     (n) Tap the coupling (4) with the MALLET - SOFT FACE.
     (o) TORQUE the coupling (4) again to between 80 and 75 lbf.in (0.90 and 0.85 m.daN ) T.
     (p) TORQUE the two bolts (2) to between 44 and 38 lbf.in (0.50 and 0.43 m.daN ) T.

END OF POST SB C-75-00-0022A (LPC Cabin Odor Configuration)

   (7) Examine the assembly for foreign objects, damage and correct assembly.
5. Close-up
Subtask 75-26-02-410-050-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 right thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR
Subtask 75-26-02-440-050-A ** ON A/C NOT FOR ALL
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 75-26-02-410-051-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).
   (4) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)
Subtask 75-26-02-720-050-A ** ON A/C NOT FOR ALL
D. Test
   (1) Do the test No. 3 - Idle power test (Ref. AMM TASK 71-00-00-720-811).
[Rev.10 from 2021] 2026.04.01 13:02:06 UTC
"Aviabrain" 2025