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

TASK 75-24-49-000-802-A
Removal of the Turbine Active Clearance Control (ACC) Ducts

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.

ZONE: 400

1. Reason for the Job
Use this procedure to remove the Active Clearance Control (ACC) ducts.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	COVER - PROTECTION

B. 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

C. Referenced Information

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

3. Job Set-up
Subtask 75-24-49-941-061-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 75-24-49-010-068-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 the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 75-24-49-040-058-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 75-24-49-010-069-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the right thrust reverser cowl-door (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 75-24-49-020-071-A ** ON A/C NOT FOR ALL

A. Removal of the Turbine Active Clearance Control (ACC) Ducts
(1) Find the ACC ducts (AD03) (1) and (AD04) (16) located at approximately the 1 o'clock position and connected to the ACC valve.
(2) Remove the ACC duct (AD03) (1) from the ACC valve as follows:
(a) Remove the clamp (5).
(b) Remove the two nuts (4) and the two bolts (2).
(c) Disconnect the two connecting links from the ACC duct (AD03) (1).
(d) Remove the clamp (3).
(e) Disconnect the cooling air tube.
(f) Remove the ACC duct (AD03) (1).
(3) Remove the ACC valve (Ref. AMM TASK 75-24-01-000-801).
(4) Remove the ACC duct (AD04) (16) from the ACC valve and the manifolds as follows:
(a) Remove the clamp (17).
(b) Remove the four bolts (15).
(c) Remove the ACC duct (AD04) (16) and the seal (18) closest to the ACC duct (AD04) (16).
(d) Remove the seal (18) from the ACC duct (AD04) (16) tabs.
(e) Disengage the coupling (19) and the seal (18) that remains, from the tabs on the tube if necessary.
(f) Remove the coupling (19) and the seal (18) from the tube if necessary.
(g) Discard the two removed seals (18).

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

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

[Rev.10 from 2021] 2026.04.01 03:13:02 UTC