Inspection of the Turbine Case [CFMB]

TASK 72-54-00-210-005-A
Inspection of the Turbine Case

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This TASK is applicable for NON /P engines.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
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 72-00-00-200-025-A	Over-Serviceable-Limit Extensions
TASK 72-00-00-200-025-A-01	Over-Serviceable-Limit Extensions
TASK 72-54-00-300-004-A	Replacement of the Broken Studs of EGT (T49.5) Sensor Bracket Assy
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 Piping of LPT Case Air Cooling
Inspection of Boroscope plug

3. Job Set-up
Subtask 72-54-00-941-060-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 72-54-00-010-073-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Let the temperature of parts decrease to ambient temperature.

Subtask 72-54-00-040-060-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-010-079-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

4. Procedure
Subtask 72-54-00-210-052-A ** ON A/C NOT FOR ALL

A. Inspect the Turbine Case for the Following

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Aft flange.
A.Cracks that connect bolt holes.	Not serviceable
B.Cracks that extend from bolt holes to outer edge of flange.	5 cracks with a minimum 5 hole separation between cracks.
C.Cracks that extend from bolt holes toward casing skin.	Not serviceable.
D.Cracks in other areas of flange.	5 cracks per flange, 0.25 in. (6.35 mm) long with a minimum 5 in. (127 mm) separation between any other cracks.	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
E.Nicks, scores and scratches.	Any number, 1 in. (25.4 mm) long, 0.01 in. (0.25 mm) deep after removal of high metal with 1 in. (25.4 mm) minimum separation.
F.Cracks in flange/case skin radius.	Not serviceable.
2.Casing skin for:
A.Cracks in parent metal	Any number, 0.04 in. (1 mm) long and 2 in. (50.8 mm) minimum apart.	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
B.Nicks and scratches.	Any number, 0.01 in. (0.25 mm) deep after removal of high metal.
C.Dents	Any number, smooth contour, 0.02 in. (0.5 mm) deep.
3.All threaded ports and bosses for:
A.Damaged threads.	One full thread, cumulative or continuous, may be removed after chasing threads.
B.Cracks in weld of ports and bosses.	One per port in boss, 0.04 in. (1 mm) long.	See limit extensions (Ref. AMM TASK 72-00-00-200-025).
4.Cap Assemblies for Inspection of Boroscope plug
A.Cracks	Not serviceable
B.Findind on threads	Any amount not more than 1/2 full thread after removal of high metal
C.Defective spring	Not serviceable	A continue in service limit of maximum 10 cycles is permitted
5.Ring sector support for:
A.Cracks	Any number, if attachment parts are secured.
6.Angle brackets for:
A.Broken bracket.	Not serviceable.
B.Cracks in all other areas.	Any amount providing cooling air tubes and attaching fasteners are secured.
7.Cooling air tube supports for:
A.Cracks at mounting flanges.	Any amount providing support is secured.
B.Cracks in all other areas:	Any amount providing cooling air tubes and attaching fasteners are secured.
8.Low Pressure Turbine Active Clearance Control (LPTACC) cooling air manifold for: Inspection of Piping of LPT Case Air Cooling ** ON A/C NOT FOR ALL
A.Cracks	Not serviceable.
B.Dents or flat areas	Any amount if the contour is not more than 20 percent of the original tube outer diameter.
9.LPTACC cooling air duct for: Inspection of Piping of LPT Case Air Cooling ** ON A/C NOT FOR ALL
A.Cracks	Not serviceable.
B.Dents or flat areas	Any amount if the contour is not more than 20 percent of the original tube outer diameter.
10.The EGT (T49.5) sensors probe brackets for:
A.Damaged threads	One full thread, cumulative or continuous, can be removed after chasing threads.	See the over-serviceable-limit extensions related to the LPT case (Ref. AMM TASK 72-00-00-200-025).
B.Broken stud	Not permitted.	Replace the stud by a bolt (Ref. AMM TASK 72-54-00-300-004) if access to bracket permits this. If not, replace the engine.See the over-serviceable-limit extensions related to the LPT case (Ref. AMM TASK 72-00-00-200-025).

5. Close-up
Subtask 72-54-00-410-074-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) Close the thrust reverser cowl doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-54-00-440-060-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 72-54-00-410-080-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 02:43:11 UTC