General Visual Inspection of Piping of LPT Case Air Cooling [CFMI]

TASK 72-54-00-210-003-A
General Visual Inspection of Piping of LPT Case Air Cooling

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	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-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 72-00-00-200-005-A	Over-Serviceable-Limit Extensions
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Visual Inspection of Piping of LPT Case Air Cooling

3. Job Set-up
Subtask 72-54-00-941-055-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 72-54-00-010-055-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 72-54-00-040-055-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-010-065-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 72-54-00-210-051-A ** ON A/C NOT FOR ALL

A. Inspect Cooling Air Tubes and Manifolds as Follows

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Cooling air manifold for:
A.Cracks in mounting lug	One crack on each lug, if not longer than 0.2 in. (5 mm)
B.Cracks in sheet metal	Any number, if not longer than 0.5 in. (12.7 mm) , 1 in. (25.4 mm) apart, and 3 in. (76.2 mm) cumulative length.	Refer to limit extensions (Ref. AMM TASK 72-00-00-200-005).
C.Dents	Any number if smooth contour and not deeper than 0.03 in. (0.76 mm).
2.Cooling air tubes for:
A.Cracks in tubes	Any number if not longer than 2 in. (50.8 mm) and separated by at least one support member.
B.Dents	Any number, if no more than 30 percent of tube outer diameter.
C.Cracks in tube clamps	Any number if tubes are correctly attached.
3.Low Pressure Turbine Active Clearance Control (LPTACC) cooling air manifold for:
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.
4.LPTACC cooling air duct for:
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.

5. Close-up
Subtask 72-54-00-410-059-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 72-54-00-440-055-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-410-065-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] 2026.04.02 06:33:49 UTC