Mechanical Check of the Low Pressure Compressor (LPC) (2.5) Bleed Air System [PW11]

TASK 75-32-01-200-801-A
Mechanical Check of the Low Pressure Compressor (LPC) (2.5) Bleed Air System

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.

1. Reason for the Job
Use this procedure to make sure that the LPC (2.5) bleed air system is serviceable.

NOTE: All Electronic Engine Control (EEC) monitored faults are transmitted to the aircraft Centralized Fault Display Interface Unit (CFDIU). The Multipurpose Control and Display Unit (MCDU) permits interactive dialog with the EEC. The MCDU can be used to review the last leg report, scheduled maintenance faults report, and ground faults report. If there are LPC bleed system faults reported, they must be troubleshoot first.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-21-08-000-801-A	Removal of the Fan Exit Liner Segments
TASK 72-21-08-400-801-A	Installation of the Fan Exit Liner Segments
TASK 73-21-00-710-809-A	Test No.15 - Operation Test (Dry Motor) of the FADEC System Engine Actuators
TASK 75-00-00-210-802-A	Visual Examination of the Engine Air Systems
TASK 75-32-01-000-801-A	Removal of the Low Pressure Compressor (LPC) (2.5) Bleed Valve Actuator
TASK 75-32-01-400-801-A	Installation of the Low Pressure Compressor (LPC) (2.5) Bleed Valve Actuator
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
Mechanical Check of the Low Pressure Compressor (LPC) (2.5) Bleed Air System

3. Job Set-up
Subtask 75-32-01-941-052-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 75-32-01-010-054-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 75-32-01-040-052-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 75-32-01-010-055-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 75-32-01-210-050-A ** ON A/C NOT FOR ALL

A. Mechanical Check of the Low Pressure Compressor (LPC) (2.5) Bleed Air System

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

(1) Find the LPC (2.5) bleed valve actuator at the 10 o'clock position.
(2) Remove the fan exit liner segment adjacent to the actuator (Ref. AMM TASK 72-21-08-000-801).
(3) Remove the actuator connecting link bolt and disengage the connecting link from the actuator (Ref. AMM TASK 75-32-01-000-801).

NOTE: Rigging is not necessary for the LPC (2.5) bleed air system.

(4) Do a visual check to see if the LPC (2.5) bleed valve is in the open (forward) position. If it is not in the open (forward) position, this can identify a system problem.
(5) Do a visual inspection of the LPC (2.5) bleed air system (Ref. AMM TASK 75-00-00-210-802).
(6) Check the LPC (2.5) bleed air system as follows:
(a) Manually hold the bellcrank and move the bleed valve aft (closed) and forward (open). If the bleed valve does not move, remove the engine from service.
(b) Move the bleed valve back to the open (forward) position.

NOTE: The bleed valve must be open at engine start for the engine to operate correctly.

(7) Attach the connecting link to the actuator (Ref. AMM TASK 75-32-01-400-801).
(8) If necessary, do a check for correct operation of the actuator (Ref. AMM TASK 73-21-00-710-809).
(9) Install the fan exit liner segment adjacent to the actuator (Ref. AMM TASK 72-21-08-400-801).
(10) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 75-32-01-410-051-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 thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 75-32-01-440-051-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 75-32-01-410-052-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).

[Rev.10 from 2021] 2026.04.01 03:13:41 UTC