Inspection/Check of the Low Pressure Turbine Shaft Assembly [CFMB]

TASK 72-55-00-200-002-A
Inspection/Check of the Low Pressure Turbine Shaft Assembly

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.

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 1M (3 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 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 72-56-00-000-002-A	Removal of the Oil Inlet Cover Assembly
TASK 72-56-00-400-002-A	Installation of the Oil Inlet Cover Assembly
TASK 78-11-11-000-041-A	Removal of the Core Nozzle Assembly
TASK 78-11-11-400-041-A	Installation of the Core Nozzle Assembly
TASK 78-11-12-000-041-A	Removal of the Centerbody
TASK 78-11-12-400-041-A	Installation of the Centerbody
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Inspection of Air/Oil Separator Exposed Areas

3. Job Set-up
Subtask 72-55-00-941-053-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) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five 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) in position to tell persons not to energize the FADEC 1(2).

Subtask 72-55-00-010-054-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(4) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

Subtask 72-55-00-040-051-A ** ON A/C NOT FOR ALL

C. Deactivation of 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) Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-481-041).

Subtask 72-55-00-010-055-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 72-55-00-860-051-A ** ON A/C NOT FOR ALL

E. Aircraft Maintenance Configuration
(1) Make sure that the core nozzle is removed (Ref. AMM TASK 78-11-11-000-041).
(2) Make sure that the centerbody is removed (Ref. AMM TASK 78-11-12-000-041).
(3) Make sure that the oil inlet cover assembly is removed (Ref. AMM TASK 72-56-00-000-002).

4. Procedure
Subtask 72-55-00-210-051-A ** ON A/C NOT FOR ALL

A. Visual Inspection of the Turbine Frame Assembly

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Air/oil separator (all areas, if exposed) for:
A.Corrosion or pitting	Any amount
B.Cracks in weld beads	Not serviceable
2.Center vent tube rear extension duct
A.Seal teeth for:
Cracks or missing seal tooth	Not serviceable
Seizure marks, scratches, nicks and dents	Any amount, 0.003 in. (0.08 mm) deep max.
Bent seal tooth	Any amount, if the cumulative length of the defect is not more than 1/12 of the circumference
High metal	Not serviceable
Waviness	All quantities permitted, if the amplitude of the indication is not more than 0.015 in. (0.4 mm)
Worn outer diameter	All quantities permitted, if the seal tooth outer diameter is between: 2.0729 in. (52.65 mm) and 2.079 in. (52.81 mm), for configuration PRE CFMI SB 72-0436 and POST CFMI SB 72-1015 2.0768 in. (52.75 mm) and 2.079 in. (52.81 mm), for configuration POST CFMI SB 72-0436 and PRE CFMI SB 72-1015.

5. Close-up
Subtask 72-55-00-410-054-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the oil inlet cover assembly (Ref. AMM TASK 72-56-00-400-002).
(3) Install the centerbody (Ref. AMM TASK 78-11-12-400-041).
(4) Install the core nozzle (Ref. AMM TASK 78-11-11-400-041).
(5) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(6) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(7) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 72-55-00-440-051-A ** ON A/C NOT FOR ALL

B. Activation of the Thrust Reverser
(1) Make the thrust reverser serviceable after maintenance (Ref. AMM TASK 78-30-00-081-041).

Subtask 72-55-00-410-055-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:43:18 UTC