Removal of the High Pressure Compressor (HPC) Stage 7 Solenoid Valve [IAE]

TASK 75-32-51-000-012-A
Removal of the High Pressure Compressor (HPC) Stage 7 Solenoid Valve

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400
FIN: 4020KS1 ** ON A/C NOT FOR ALL
FIN: 4020KS2 ** ON A/C NOT FOR ALL
FIN: 4020KS3 ** ON A/C NOT FOR ALL

1. Reason for the Job
The HPC stage 7 solenoid valve 4020KS3 controls the HPC bleed valve at the lower left position.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	COVER - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
HPC Stage 7 Solenoid Valves
Stage 7 Compressor Bleed Solenoid Valve Mounting Location

3. Job Set-up
Subtask 75-32-51-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 75-32-51-010-051-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 75-32-51-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the HPC stage 7 solenoid valve
(1) Remove the HP3 air inlet tube

HPC Stage 7 Solenoid Valves ** ON A/C NOT FOR ALL

(a) Cut and discard the wire and disconnect the HP3 air inlet tube (1) from the solenoid valve.
(b) Cut and discard the wire and disconnect the air inlet tube from the HP3 air tube.
(c) Remove the HP3 air inlet tube (1).
(2) Cut and discard the wire and disconnect the HP3 air outlet tube (2) from the solenoid valve.

HPC Stage 7 Solenoid Valves ** ON A/C NOT FOR ALL

(3) Disconnect the electrical connector (6) from the solenoid valve

HPC Stage 7 Solenoid Valves ** ON A/C NOT FOR ALL

(4) Remove the HPC stage 7 solenoid valve

HPC Stage 7 Solenoid Valves ** ON A/C NOT FOR ALL

Stage 7 Compressor Bleed Solenoid Valve Mounting Location ** ON A/C NOT FOR ALL

(a) Remove the bolts (4) and the washers (5) which attach the solenoid valve to the mounting bracket (3).
(b) Remove the solenoid valve.

Subtask 75-32-51-620-051-A ** ON A/C NOT FOR ALL

B. Put the applicable COVER - BLANKING on all the openings.

[Rev.10 from 2021] 2026.04.01 03:12:22 UTC