Mechanical Check of the High Pressure Compressor (HPC) Stator Vane Control System [PW11]

TASK 75-31-00-200-802-A
Mechanical Check of the High Pressure Compressor (HPC) Stator Vane Control 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.

ZONE: 400

1. Reason for the Job
Use this procedure to do a mechanical check of the High Pressure Compressor (HPC) stator vane systems.

NOTE: Any Electronic Engine Control (EEC) monitored faults are transmitted to the aircraft Centralized Fault Display System (CFDS).
The CFDS allows interactive dialog with the EEC.
Use the CFDS to review any EEC related faults.
If there are any EEC sensor related faults reported, troubleshoot them first.

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

REFERENCE	QTY	DESIGNATION
No specific	1	FLASHLIGHT
No specific	1	MAGNIFYING GLASS POWER 03X
No specific	1	MAGNIFYING GLASS POWER 10X
No specific	1	MIRROR - INSPECTION
No specific	1	STEPLADDER 0.5 M (1.6 FT)
No specific	1	WRENCH - TORQUE, STANDARD
No specific	Torque wrench: range to between 420 and 180 lbf.in (4.75 and 2.03 m.daN )

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 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 75-31-02-000-801-A	Removal of the High Pressure Compressor (HPC) Stator Vane Actuator (SVA) Primary
TASK 75-31-02-400-801-A	Installation of the High Pressure Compressor (HPC) Stator Vane Actuator (SVA) Primary
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 - (HPC Stator Wrench Locator)

3. Job Set-up
Subtask 75-31-00-941-072-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 75-31-00-010-094-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 STEPLADDER 0.5 M (1.6 FT) in position.

Subtask 75-31-00-040-067-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 75-31-00-010-095-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 75-31-00-200-050-A ** ON A/C NOT FOR ALL

A. Mechanical Check of the HPC Stator Vane Control System
(1) Remove the fan exit liner segment forward of the Low Pressure Compressor (LPC) Stator Vane Actuator (SVA) (Ref. AMM TASK 72-21-08-000-801).
(2) Do a visual inspection of the stator vane control systems (Ref. AMM TASK 75-00-00-210-802).
(3) Do a check of the HPC stator vane control system:
(a) If necessary, loosen or disconnect the hydraulic fuel pressure tube (CP03) and hydraulic fuel return tube (CR03) to remove hydraulic pressure from the HPC SVAs (Ref. AMM TASK 75-31-02-000-801).
(b) Moving of the primary HPC SVA:

CAUTION: WHEN YOU OPERATE THE HPC VANES, USE ONLY THE SPECIFIED WRENCHING PAD. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO ENGINE COMPONENTS CAN OCCUR.

1 Apply a TORQUE to between 420 and 180 lbf.in (4.75 and 2.03 m.daN )

on the wrenching feature to move the primary HPC SVA from the fully closed (actuator rod retracted) to the fully open (actuator rod extended) position with a WRENCH - TORQUE, STANDARD of 12 in. (304.80 mm).
a Use the MIRROR - INSPECTION, MAGNIFYING GLASS POWER 03X - MAGNIFYING GLASS POWER 10X and FLASHLIGHT, if necessary to do a check to see if the actuator is fully extended and retracted.
(c) Operation must be smooth with no binding.
(d) Apply a TORQUE to between 420 and 180 lbf.in (4.75 and 2.03 m.daN )

to return the HPC SVA to the fully closed (actuator rod retracted) position with a WRENCH - TORQUE, STANDARD of 12 in. (304.80 mm).
(e) If necessary, connect the hydraulic fuel pressure tube (CP03) and the hydraulic fuel return tube (CR03) to the actuator (Ref. AMM TASK 75-31-02-400-801).
(4) Install the fan exit liner segment forward of the LPC SVA (Ref. AMM TASK 72-21-08-400-801).
(5) If necessary, do the operation test (dry motor) of the Full Authority Digital Engine Control (FADEC) system engine actuators (Ref. AMM TASK 73-21-00-710-809).
(6) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 75-31-00-410-088-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 75-31-00-440-067-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 75-31-00-410-089-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the access platform(s).
(2) 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.
(3) Remove the WARNING NOTICE(S).
(4) If required, check for the proper operation of the SVAs (Ref. AMM TASK 73-21-00-710-809).

[Rev.10 from 2021] 2026.04.01 03:13:27 UTC