Removal of the Component Cooling Lines [PW11]

TASK 75-24-49-000-803-A
Removal of the Component Cooling Lines

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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.

ZONE: 400

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 2M (6 FT) - ADJUSTABLE
No specific	1	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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 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 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
Component Cooling Hoses

3. Job Set-up
Subtask 75-24-49-941-063-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 75-24-49-010-074-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 2M (6 FT) - ADJUSTABLE in position.

Subtask 75-24-49-040-061-A ** ON A/C NOT FOR ALL

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

Subtask 75-24-49-010-075-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

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 75-24-49-020-072-A ** ON A/C NOT FOR ALL

A. Removal of the Component Cooling Lines
(1) Remove the Active Clearance Control (ACC) hose assembly (1).
(a) Remove the two clamps (2) on the ACC hose assembly (1).
(b) Carefully remove the ACC hose assembly (1) from the ACC scoop and the component-cooling tube assembly.
(c) Install COVER - PROTECTION on the ACC hose assembly (1), ACC scoop and the component-cooling tube assembly.
(2) Remove the Starter Air Valve (SAV) hose assembly (3).
(a) Remove the two clamps (4) on the SAV hose assembly (3).
(b) Carefully remove the SAV hose assembly (3) from the SAV and the component-cooling tube assembly.
(c) Install COVER - PROTECTION on the SAV hose assembly (3), SAV and the component-cooling tube assembly.
(3) Remove the flow-divider-valve hose assembly (5).
(a) Remove the two clamps (6) on the flow-divider-valve hose assembly (5).
(b) Carefully remove the flow-divider-valve hose assembly (5) from the flow divider valve and the component-cooling tube assembly.
(c) Install COVER - PROTECTION on the flow-divider-valve hose assembly (5), flow divider valve and the component-cooling tube assembly.

[Rev.10 from 2021] 2026.04.01 04:53:51 UTC