Removal of the Left Modulated Turbine Cooling (MTC) Actuator [CFML]

TASK 75-23-05-000-801-A
Removal of the Left Modulated Turbine Cooling (MTC) Actuator

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.

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

ZONE: 400
FIN: 4163KS

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - PROTECTION
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 72-24-01-000-801-A	Removal of Segment Shrouds 1 thru 5
TASK 72-24-80-000-801-A	Removal of the Variable Bleed Valve (VBV) Ducts
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
CMM 752305
Left Modulated Turbine Cooling Actuator

3. Job Set-up
Subtask 75-23-05-941-050-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 75-23-05-010-050-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.

Subtask 75-23-05-040-050-A

C. Deactivation of the Thrust Reverser System 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 78-30-00-040-809).

Subtask 75-23-05-010-051-A

D. Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR.

4. Procedure

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.

Subtask 75-23-05-020-050-A

A. Removal of the Left Modulated Turbine Cooling (MTC) Actuator
(1) Remove segment shroud 5 (Ref. AMM TASK 72-24-01-000-801).
(2) Remove VBV duct 6 (Ref. AMM TASK 72-24-80-000-801).
(3) Remove the air-core compartment cooling-duct (13) as follows:
(a) Remove the hose clamp (10) that attaches the air-core compartment cooling-duct (13) to the left-side-core compartment cooling-manifold (9).
(b) Remove the air-core compartment cooling-duct (13) from the left-side-core compartment cooling-manifold (9) and the support bracket (12).
(c) Remove the air-core compartment cooling-duct (13) from the engine.
(4) Remove the support bracket (12) as follows:
(a) Remove the bolt (14) that attaches the loop clamp (15) and HJ8A electrical harness (7) to the support bracket (12).
(b) Remove the bolt (16) that attaches the loop clamp (17) and HJ5A electrical harness (1) to the support bracket (12).
(c) Remove the HJ5B electrical harness (3) and HJ8B electrical harness (2) from the support bracket (12) clips.
(d) Remove the two bolts (8) that attach the support bracket (11) to the support bracket (12) and remove the support bracket (12) from the engine.
(5) Disconnect the electrical connector (31) from the left MTC actuator (24) (Ref. AMM TASK 70-70-00-910-804).
(6) Put the CONTAINER 5 L (1.32 USGAL) below the drain tube (19).
(7) Remove the drain tube (19) as follows:
(a) Disconnect the drain tube (19) B-nut from the drain tube (20).
(b) Disconnect the drain tube (19) B-nut from the hydraulic VSV fuel tube-hose (18) and remove the drain tube (19) from the engine.
(8) Put the CONTAINER 5 L (1.32 USGAL) below the MTC fuel-hydraulic manifold (30).
(9) Disconnect the MTC drain tube (29) B-nut from the MTC fuel-hydraulic manifold (30) and from the drain tube (37). Remove the MTC drain tube (29).
(10) Disconnect the MTC fuel-hydraulic manifold (30) B-nuts (two locations) from the fuel-hydraulic manifold (28).
(11) Remove the four bolts (35) that attach the MTC fuel-hydraulic manifold (30) to the left MTC actuator (24) and remove the MTC fuel-hydraulic manifold (30) from the engine.
(12) Remove and discard the seal flange gasket (36).
(13) Remove the bolt (25) and nut (27) that attach the left MTC actuator (24) rod to the MTC valve link (26).
(14) Remove the four bolts (34) and the four spacers (33) that attach the left MTC actuator (24) to the MTC bracket (32) and remove the left MTC actuator (24) from the engine.
(15) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and the disconnected connectors.

Subtask 75-23-05-620-050-A

B. Preservation of the left MTC Actuator
(1) In the instance of shipping or prolonged storage, preserve the left MTC actuator as per the CMM 752305.

[Rev.10 from 2021] 2026.04.01 12:57:44 UTC