Removal of the Turbine Cooling Air (TCA) Tubes [IAE]

TASK 75-23-49-000-010-A
Removal of the Turbine Cooling Air (TCA) Tubes

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.

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** 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	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 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
Turbine Cooling Air Tubes

3. Job Set-up
Subtask 75-23-49-941-050-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 75-23-49-010-052-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 2M (6 FT) - ADJUSTABLE in to position.

Subtask 75-23-49-040-051-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 75-23-49-010-050-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

4. Procedure
Subtask 75-23-49-020-050-A ** ON A/C NOT FOR ALL

A. Remove the TCA tube (2) from the engine.
(1) Remove the bolt (3) and the two bolts (8), the nut (5) and the two nuts (6) and the two clamps (4) and (7) from the TCA tube (2).
(2) Remove the four bolts (11) and the bracket (10) from the HP compressor case.
(3) Remove the lockwire and remove the four bolts (1) from the HP turbine case.
(4) Remove the TCA tube (2) from the engine.
(5) Remove the two metal C seals (12) and (9).
(6) Discard the seals.

Subtask 75-23-49-020-051-A ** ON A/C NOT FOR ALL

B. Remove the TCA tube (2) from the engine.
(1) Remove the two bolts (3) and (8), the two nuts (4) and (6) and the two clamps (5) and (7) from the TCA tube (2).
(2) Remove the four bolts (9) from the HP compressor case.
(3) Remove the lockwire and remove the four bolts (11) from the HP turbine case.
(4) Remove the TCA tube (2) from the engine.
(5) Remove the two metal C seals (1) and (10).
(6) Discard the seals.

Subtask 75-23-49-020-052-A ** ON A/C NOT FOR ALL

C. Remove the TCA tube (2) from the engine.
(1) Remove the two bolts (3) and (7), the two nuts (5) and (6) and the two clamps (4) and (8) from the TCA tube (2).
(2) Remove the four bolts (11) from the HP compressor case.
(3) Remove the lockwire and remove the four bolts (10) from the HP turbine case.
(4) Remove the TCA tube (2) from the engine.
(5) Remove the two metal C seals (1) and (9).
(6) Discard the seals.

Subtask 75-23-49-020-053-A ** ON A/C NOT FOR ALL

D. Remove the TCA tube (2) from the engine.
(1) Remove the two bolts (4) and (8), the two nuts (3) and (6) and the two clamps (5) and (7) from the TCA tube (2).
(2) Remove the four bolts (15) from the HP compressor case.
(3) Remove the bolt (12), the nut (10) and the clamp (11) from the bracket (13).
(4) Remove the lockwire and remove the four bolts (9) and bracket (13) from the HP turbine case.
(5) Remove the TCA tube (2) from the engine.
(6) Remove the two metal C seals (1) and (14).
(7) Discard the seals.

[Rev.10 from 2021] 2026.04.01 03:11:14 UTC