Remove the High Pressure Compressor (HPC) Stator Vane Actuator (SVA) Secondary Unit [PW11]

TASK 75-31-04-000-801-A
Remove the High Pressure Compressor (HPC) Stator Vane Actuator (SVA) Secondary Unit

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: DO NOT LET FUEL OR OIL FALL ON THE ENGINE. YOU MUST IMMEDIATELY REMOVE UNWANTED FUEL OR OIL WITH A CLOTH. THE FUEL OR OIL CAN CAUSE DAMAGE TO SOME ENGINE PARTS.

FIN: 4053KS ** ON A/C NOT FOR ALL

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	CONTAINER 20L (5 USGAL)
No specific	AR	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 73-21-04-000-801-A	Removal of the Permanent Magnet Alternator (PMA) Stator
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
TASK 79-32-21-000-801-A	Removal of the Oil Temperature Probe
High Pressure Compressor (HPC) Stator Vane Actuator (SVA) Secondary Unit

3. Job Set-up
Subtask 75-31-04-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832)

Subtask 75-31-04-010-050-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

Subtask 75-31-04-040-050-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 75-31-04-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left thrust-reverser cowl-doors (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 75-31-04-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the High Pressure Compressor (HPC) Stator Vane Actuator (SVA) Secondary Unit
(1) Find the actuator (1) located at the 8 o'clock position.
(2) Remove the actuator (1) as follows:
(a) Disconnect the wiring harness (WC10) connector (P29) from the actuator (1) with the PLIERS - JAWED, SOFT.
(b) Disconnect the wiring harness (W03) connector (P12) from the receptacle (J12) and the wiring harness (W04) connector (P11) from the receptacle (J11) (Ref. AMM TASK 73-21-04-000-801).
(c) Disconnect the wiring harness (W03) connector (P33) from the receptacle (J33) (Ref. AMM TASK 79-32-21-000-801).
(d) Remove the nut (6) and bolt (5) that attach the actuator piston to the actuator link.
(e) Put the CONTAINER 20L (5 USGAL) under the actuator (1).
(f) Put the lint-free cotton cloth (Material No.P05-005) under the actuator (1).
(3) Disconnection of the tubes

CAUTION: USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE OR HOSE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES OR HOSES.

(a) Remove the drain tube (DR23) from the bottom of the actuator (1).
(b) Remove the servo pressure fuel tube (CP18) from the actuator (1).
(c) Remove the servo return fuel tubes (CR13) and (CR18) from the actuator (1).
(d) Remove the two bolts (4) that attach the actuator (1) to the SVA bracket (2).
(e) Remove the two bolts (3) and remove the SVA bracket (2) from the HPC case.
(f) Loosen the three captive bolts that attach the actuator (1) to the SVA lever housing.
(g) Remove the actuator (1) from the engine.
(4) Installation of the protection covers

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

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

[Rev.10 from 2021] 2026.04.01 03:13:34 UTC