Removal of the High Pressure Turbine/Low Pressure Turbine (HPT/LPT) Valve Actuator [IAE]

TASK 75-24-52-000-010-A
Removal of the High Pressure Turbine/Low Pressure Turbine (HPT/LPT) Valve Actuator

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

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.

CAUTION: DO NOT LET ENGINE FUEL OR OIL FALL ON THE ENGINE. UNWANTED FUEL OR OIL MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FUEL OR OIL CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

CAUTION: DO NOT PUT FUEL THAT HAS BEEN DRAINED FROM THE ENGINE BACK IN TO THE FUEL SYSTEM.

FIN: 4027KS ** ON A/C NOT FOR ALL

1. Reason for the Job
This TASK gives the procedure for the removal of the HPT/LPT valve actuator.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	WARNING NOTICE(S)
IAE1J13504	1	PULLER REMOVAL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
HPT/LPT Valve Actuator
HPT/LPT Valve Actuator

3. Job Set-up
Subtask 75-24-52-941-050-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 75-24-52-010-051-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
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 75-24-52-040-050-A ** ON A/C NOT FOR ALL

C. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 75-24-52-010-052-A ** ON A/C NOT FOR ALL

D. Open the right thrust reverser halve (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR

4. Procedure
Subtask 75-24-52-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the HPT/LPT Valve Actuator
(1) Disconnect the harness core wiring (19) from the HPT/LPT valve actuator.

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

(2) Disconnect the three tubes from the HPT/LPT valve actuator

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

(a) Disconnect the drain tube (6) from the HPT/LPT valve actuator and drain the fuel in to a CONTAINER 10 L(2 1/2 USGAL).
(b) Disconnect the fuel tube (3) from the HPT/LPT valve actuator and drain the fuel in to a container.
(c) Remove and discard packing (2) from the HPT/LPT valve actuator.
(d) Disconnect the fuel tube (4) from the HPT/LPT valve actuator and drain the fuel in to a container.
(e) Remove and discard packing (5) from the HPT/LPT valve actuator.
(3) Disconnect the actuator rod assembly from the HPT/LPT valve actuator

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

(a) Remove the pin (12), the nut (13) and the bolt (10) and disconnect the actuator rod assembly (11) from the HPT/LPT valve actuator.
(b) Use the IAE1J13504 PULLER REMOVAL to remove the two bushes (9) and (14) from the actuator rod assembly (11).

Subtask 75-24-52-020-052-A ** ON A/C NOT FOR ALL

B. Disconnection of the Stator Rod Assembly from the HPT/LPT Valve Actuator

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

(1) Remove the pin (16), the nut (17) and the bolt (7) and disconnect the stator rod assembly (15) from the HPT/LPT valve actuator.

Subtask 75-24-52-020-050-A ** ON A/C NOT FOR ALL

C. Removal of the HPT/LPT Valve Actuator

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

(1) Remove the two bolts (28) and the two nuts (22).
(2) Move the HPT/LPT valve actuator (1) to release it from the actuator rod assembly (11) and the stator rod assembly (15).

Subtask 75-24-52-020-055-A ** ON A/C NOT FOR ALL

D. Removal of the Bushes from the HPT/LPT Valve Actuator

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

(1) Use the IAE1J13504 PULLER REMOVAL, to remove the bush (18) from the HPT/LPT valve actuator (1).

Subtask 75-24-52-020-057-A ** ON A/C NOT FOR ALL

E. Removal of the HPT/LPT Valve Actuator
(1) Remove the insulation blanket from the HPT/LPT valve actuator

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

NOTE: Do not remove the insulation blanket if it has no damage. The insulation blanket is a part of HPT/LPT valve actuator.

(a) Remove the lockwire from the insulation blanket (20).
(b) Remove the insulation blanket (20) from the HPT/LPT valve actuator (1).
(2) Remove the fittings

HPT/LPT Valve Actuator ** ON A/C NOT FOR ALL

NOTE: Do not remove the fittings if they have no damage. The fittings are parts of HPT/LPT valve actuator.

(a) Remove the lockwire from the pressure fitting (25), the return fitting (24) and the drain fitting (27).
(b) Remove the pressure fitting (25), the return fitting (24) and the drain fitting (27).
(c) Remove and discard packings (26), (23) and (29).

[Rev.10 from 2021] 2026.04.01 13:08:45 UTC