Mechanical Check of the Low Pressure Compressor (LPC) Stator Vane Control System [PW11]

TASK 75-31-00-200-803-A
Mechanical Check of the Low Pressure Compressor (LPC) 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 Low Pressure Compressor (LPC) stator vane systems.

NOTE: All Electronic Engine Control (EEC) monitored faults are transmitted to the aircraft Centralized Fault Display System (CFDS). The CFDS gives interactive dialog with the EEC. Use the CFDS to examine all EEC related faults. If there are EEC sensor related fault reports, troubleshoot them first.

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

REFERENCE	QTY	DESIGNATION
No specific	1	BAR LENGTH 60 CM (2 FT) BREAKER
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)

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

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 75-31-01-000-801-A	Removal of the Low Pressure Compressor (LPC) Stator Vane Actuator (SVA)
TASK 75-31-01-400-801-A	Installation of the Low Pressure Compressor (LPC) Stator Vane Actuator (SVA)
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) Stator Vane Control System - (Config-1 Initial Design Configuration)
Mechanical Check Of The LPC Stator Vane Control System - (Config-2 Case Assembly Durability Improvement Configuration)

3. Job Set-up
Subtask 75-31-00-941-073-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 75-31-00-010-096-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 75-31-00-040-068-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 75-31-00-010-097-A ** ON A/C NOT FOR ALL

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

4. Procedure

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

Subtask 75-31-00-200-051-A ** ON A/C NOT FOR ALL

A. Mechanical Check of the LPC Stator Vane Control System
(1) Remove the fan exit liner segment forward of the 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).

PRE SB C-75-00-013A (Config-1 Initial Design Configuration)

(3) Do a check of the LPC stator vane control system as follows:

Mechanical Check of the Low Pressure Compressor (LPC) Stator Vane Control System - (Config-1 Initial Design Configuration) ** ON A/C NOT FOR ALL

(a) Remove the insulation blanket (1) from the LPC SVA.
(b) Loosen or disconnect the hydraulic fuel pressure tube (CP02) and hydraulic fuel return tube (CR02) to remove hydraulic pressure from the LPC SVA, if necessary (Ref. AMM TASK 75-31-01-000-801).

CAUTION: MAKE SURE THAT THE LPC STATOR VANE ACTUATOR IS ATTACHED TO THE SYSTEM TO PREVENT INCORRECT MOVEMENT OF THE LPC ACTUATION SYSTEM. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO ENGINE PARTS CAN OCCUR.

(c) Use a BAR LENGTH 60 CM (2 FT) BREAKER (or equivalent) on the wrenching fixture to move the LPC SVA from the fully closed (actuator rod EXTENDED) to the fully open (actuator rod RETRACTED) position. Operation must be smooth and move freely.
1 Use 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.
(d) Return the LPC SVA to the fully closed position (actuator rod EXTENDED).
(e) Connect the hydraulic fuel pressure tube (CP02) and hydraulic fuel return tube (CR02) to the actuator, if necessary (Ref. AMM TASK 75-31-01-400-801).
(f) Install the insulation blanket (1) to the LPC SVA.

END OF PRE SB C-75-00-013A (Config-1 Initial Design Configuration)

POST SB C-75-00-013A (Config-2 Case Assembly Durability Improvement Configuration)

(4) Do a check of the LPC stator vane control system as follows:

Mechanical Check Of The LPC Stator Vane Control System - (Config-2 Case Assembly Durability Improvement Configuration) ** ON A/C NOT FOR ALL

(c) Use a breaker bar (or equivalent) on the wrenching fixture to move the LPC SVA from the fully closed (actuator rod EXTENDED) to the fully open (actuator rod RETRACTED) position. Operation must be smooth and move freely.
1 Use a 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.
(d) Return the LPC SVA to the fully closed position (actuator rod EXTENDED).
(e) Connect the hydraulic fuel pressure tube (CP02) and hydraulic fuel return tube (CR02) to the actuator, if necessary (Ref. AMM TASK 75-31-01-400-801).
(f) Install the insulation blanket (1) to the LPC SVA.

END OF POST SB C-75-00-013A (Config-2 Case Assembly Durability Improvement Configuration)

(5) Install the fan exit liner segment forward of the LPC SVA (Ref. AMM TASK 72-21-08-400-801).
(6) If necessary, do the operation test (dry motor) of the Full Authority Digital Electronic Control (FADEC) system engine actuators (Ref. AMM TASK 73-21-00-710-809).
(7) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 75-31-00-410-090-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 left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL.

Subtask 75-31-00-440-068-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 75-31-00-410-091-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).
(4) If necessary, check for the proper operation of the SVAs (Ref. AMM TASK 73-21-00-710-809).

[Rev.10 from 2021] 2026.04.01 03:13:28 UTC