Removal of the Turbine Active Clearance Control (ACC) Air Valve [PW11]

TASK 75-24-01-000-801-A
Removal of the Turbine Active Clearance Control (ACC) Air Valve

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS 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: 4055KS ** 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	PLIERS - JAWED, SOFT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth

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, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Turbine Active Clearance Control (ACC) Air Valve (Config-1 Initial Design Configuration)
Turbine Active Clearance Control (ACC) Air Valve (Config-2 Case Assembly Durability Improvement Configuration)
Turbine Active Clearance Control (ACC) Air Valve

3. Job Set-up
Subtask 75-24-01-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do 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 75-24-01-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (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) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 75-24-01-040-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser 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) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 75-24-01-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure
Subtask 75-24-01-020-050-A ** ON A/C NOT FOR ALL

CAUTION: DO NOT BEND THE FUEL TUBES WHEN YOU DISCONNECT THEM FROM THE VALVE. DAMAGE TO THE FUEL TUBES WILL OCCUR IF TOO MUCH FORCE IS APPLIED TO THE TUBES.

A. Removal of the Turbine Active Clearance Control (ACC) Air Valve

PRE SB C73-00-0009A (Config-1 Initial Design Configuration)

(1) Disconnection of the servo fuel tubes from the ACC valve (1).

Turbine Active Clearance Control (ACC) Air Valve (Config-1 Initial Design Configuration) ** ON A/C NOT FOR ALL

(a) Disconnect the electrical connector from the ACC valve (1) with PLIERS - JAWED, SOFT.
(b) Put a lint-free cotton cloth (Material No.P05-005) under the servo fuel tubes (CR11) and (CP11) to absorb any leakage.
(c) Loosen the servo return fuel tube B-nut.
(d) Disconnect the servo return fuel tube from the ACC valve (1).
(e) Loosen the servo pressure fuel tube B-nut.
(f) Disconnect the servo pressure tube from the ACC valve (1).

END OF PRE SB C73-00-0009A (Config-1 Initial Design Configuration)

POST SB C73-00-0009A (Config-2 Assembly Durability Improvement Configuration)

(2) Disconnection of the servo fuel tubes from the ACC valve (1).

Turbine Active Clearance Control (ACC) Air Valve (Config-2 Case Assembly Durability Improvement Configuration) ** ON A/C NOT FOR ALL

(a) Disconnect the electrical connector from the ACC valve (1) with PLIERS - JAWED, SOFT.
(b) Put a lint-free cotton cloth (Material No.P05-005) under the servo fuel tubes (CR26) and (CP26) to absorb any leakage.
(c) Loosen the servo return fuel tube B-nut.
(d) Disconnect the servo return fuel tube from the ACC valve (1).
(e) Loosen the servo pressure fuel tube B-nut.
(f) Disconnect the servo pressure tube from the ACC valve (1).

END OF POST SB C73-00-0009A (Config-2 Assembly Durability Improvement Configuration)

(3) Removal of the ACC valve (1).

Turbine Active Clearance Control (ACC) Air Valve ** ON A/C NOT FOR ALL

(a) Loosen the V-band couplings.
(b) Remove the V-band couplings (2) and the ACC valve (1) from the ACC inlet duct.
(4) Examine the assembly for foreign objects, damage and correct assembly.
(5) Installation of the protection covers.

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 03:12:56 UTC