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

TASK 72-54-00-210-003-B
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
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 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

3. Job Set-up
Subtask 72-54-00-941-061-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 72-54-00-010-074-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

Subtask 72-54-00-040-061-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-010-080-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 72-54-00-210-053-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 72-00-00-200-025).
C.Dents on sleeve	Any number if smooth contour and not deeper than 0.03 in. (0.76 mm).
D.Dents on box	Any number and not deeper than 0.118 in. (3.0 mm).	Serviceable after blending out high metal and sharp edges.
E.Scratches or chafing on box	Any number and not deeper than 0.004 in. (0.1 mm).
2.The repair pin of the cooling air manifold for:
A.Breakage	Not serviceable.
B.Distortion	Any amount after re-shaping.	Serviceable if, during installation, the rear support mounting lug slides freely into its housing.
C.Fretting	0.020 in. (0.5 mm) deep over 120 degrees or 0.0098 in. (0.25 mm) on the whole periphery.	Whatever the amount of fretting found, replace the wire-mesh bushing.
D.Wear groove	0.05 in. (1.27 mm) deep and 0.12 in. (3 mm) wide over 120 degrees located at approx. 0.8 in. (20 mm) from the outer end of the bracket.	Whatever the size of the wear groove found, replace the wire-mesh bushing.
3.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.
4.Low Pressure Turbine Active Clearance Control (LPTACC) cooling air manifold for:
A.Cracks	Not serviceable.
B.Dents, collapse or flat areas	Any amount if depth is not more than five percent of the outer diameter of the tube.
5.LPTACC cooling air duct for:
A.Cracks	Not serviceable.
B.Dents, collapse or flat areas	Any amount if depth is not more than five percent of the outer diameter of the tube.

5. Close-up
Subtask 72-54-00-410-075-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 72-54-00-440-061-A ** ON A/C NOT FOR ALL

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

Subtask 72-54-00-410-081-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 02:43:13 UTC