Visual Inspection of the Turbine Exhaust Case (TEC) Assembly [PW11]

TASK 72-54-00-210-802-A
Visual Inspection of the Turbine Exhaust Case (TEC) Assembly

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	FLASHLIGHT
No specific	1	MAT - PROTECTIVE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Turbine Exhaust Case (TEC) Assembly
Turbine Exhaust Case (TEC) Assembly

3. Job Set-up
Subtask 72-54-00-941-071-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

Subtask 72-54-00-010-105-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 72-54-00-040-070-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 72-54-00-010-107-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.

4. Procedure
Subtask 72-54-00-210-058-A ** ON A/C NOT FOR ALL

A. Visual Inspection of the Turbine Exhaust Case (TEC) Assembly

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Put a MAT - PROTECTIVE inside the engine exhaust to protect the inside surfaces.
(2) Do a visual inspection of the TEC assembly for damage. Use a FLASHLIGHT or other light source to look inside the engine exhaust and, if necessary, for inspection of the external TEC surfaces.
(3) For this inspection procedure, the permitted damage limits for the TEC are listed in Table 6.
(4) Do a visual examination of portions of the TEC module outside metal surfaces, rear mount lugs, bushings, external areas and flanges for cracks, nicks, dents and other damage. See Table 6 for service damage limits.
(5) Where possible, visually inspect the TEC inside metal gas path duct and struts for nicks, dents, cracks and damage. See Table 6 for service damage limits.

Table 6: Turbine Exhaust Case - Visual Examination

EXAMINE	DAMAGE	DISPOSITION
Outer duct areas (external case surfaces)
Nicks and scratches	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted.
	More than the permitted limits.	Not permitted. Remove the engine from service in five cycles or less.
Round bottom dents	Any quantity 0.010 in. (0.254 mm) maximum depth and 0.5 in. (12.700 mm) maximum diameter.	Permitted.
	More than the permitted limits.	Not permitted. Remove the engine from service in five cycles or less.
Cracks	Any amount in any direction.	Not permitted. Remove the engine from service in five cycles or less.
Case front flange P and inner and outer rear flange, both sides
Nicks and scratches	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted.
	More than the permitted limits.	Not permitted. Remove the engine from service in five cycles or less.
Round bottom dents	Any quantity 0.010 in. (0.254 mm) maximum depth and 0.5 in. (12.700 mm) maximum diameter.	Permitted.
	More than the permitted limits.	Not permitted. Remove the engine from service in five cycles or less.
Cracks	Any amount from the flange bolt hole outward.	Permitted.
	Any amount from the flange bolt hole outward, but not into the fillet radius.	Permitted for reduced inspection interval of 425 hours.
	Any amount from the flange bolt hole outward, but not to the fillet radius.	Not permitted. Remove the engine from service in five cycles or less.
Mount and fail-safe lugs on top of the case (4 locations) NOTE: Fail safe-lugs do not have bushings.
Nicks and scratches	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted.
	More than the permitted limits.	Not permitted. Remove the engine from service in five cycles or less.
Round bottom dents	Any quantity 0.010 in. (0.254 mm) maximum depth and 0.5 in. (12.700 mm) maximum diameter.	Permitted.
	More than the permitted limits.	Not permitted. Remove the engine from service in five cycles or less.
Cracks	Any amount in any direction.	Not permitted. Remove the engine from service in five cycles or less.
Mount bushings on lugs at top of case (4 locations)
Scratches or scoring	Any quantity 0.004 in. (0.102 mm) maximum depth.	Permitted.
	Any quantity more than 0.004 in. (0.102 mm) and less than 0.008 in. (0.203 mm) depth.	Not permitted. Blend repair or remove the engine from service in 25 cycles or less.
	More than the permitted limits.	Not permitted. Remove the engine from service in five cycles or less.
Visible wear or hole elongation	Any quantity.	Not permitted. Remove the engine from service in five cycles or less.
Cracks	Any quantity.	Not permitted. Remove the engine from service in five cycles or less.
Rear mount bushing movement	Gap less than 0.001 in. (0.025 mm) movement between TEC mount lug and bushing flange.	Permitted.
Oil supply and scavenge tubes
Correct assembly of tubes, clamps and shields	Any quantity of loose, broken or missing parts.	Not permitted. Disassemble to repair as necessary.
Nicks, scratches and sharp bottom dents	Any quantity 0.005 in. (0.127 mm) maximum depth.	Permitted.
	More than the permitted limits.	Not permitted. Replace tube.
Round bottom dents	Any quantity 0.025 in. (0.635 mm) maximum depth.	Permitted.
	More than the permitted limits.	Not permitted. Replace tube.
Cracks	Any quantity.	Not permitted. Replace tube.
External brackets
Correct assembly of brackets and attachments	Any quantity.	Not permitted. Disassemble to correct as necessary.
Bends and missing nut plates	Any quantity.	Not permitted. Disassemble to repair or replace bracket as necessary.
Cracks	Any quantity.	Not permitted. Replace bracket.
Struts (10 locations)
Strut airfoil, pressure and suction surfaces for cracks	Any amount of cracks less than 0.25 in. (6.350 mm) in length which do not extend further than airfoil.	Permitted for a reduced inspection interval of 425 hours.
	More than two cracks per strut airfoil and/or total cumulative length of all cracks more than 0.25 in. (6.350 mm).	Not permitted. Remove the engine from service in five cycles or less.
	U-shaped cracks where the metal can break loose.	Not permitted. Remove the engine from service in five cycles or less.
	Cracks in Area A (top three struts).	Not permitted. Remove the engine from service in five cycles or less.
Strut leading edge for cracks	Axial cracks 0.25 in. (6.350 mm) or less in total length through airfoil to the leading edge and into leading edge fillet radius in Area B only.	Permitted for a reduced inspection interval of 425 hours.
	Axial cracks more than 0.25 in. (6.350 mm) in total length through airfoil to the leading edge and into leading edge fillet radius in Area B only.	Not permitted. Remove the engine from service in five cycles or less.
	Radial cracks 0.25 in. (6.350 mm) or less in total length, in or adjacent to the leading edge, but not into leading edge fillet radius in Area B only.	Permitted for a reduced inspection interval of 425 hours.
	Radial cracks more than 0.25 in. (6.350 mm) in total length through the airfoil to leading edge fillet radius in Area B only.	Not permitted. Remove the engine from service in five cycles or less.
	Cracks in Area A (top three struts).	Not permitted. Remove the engine from service in five cycles or less.
Strut trailing edge for cracks	Axial cracks 0.75 in. (19.050 mm) or less in total length through airfoil to the trailing edge and into trailing edge fillet radius in Area B only.	Permitted for a reduced inspection interval of 425 hours.
	Axial cracks more than 0.75 in. (19.050 mm) in total length through airfoil to the trailing edge and into trailing edge fillet radius in Area B only.	Not permitted. Remove the engine from service in five cycles or less.
	Cracks in Area A (top three struts).	Not permitted. Remove the engine from service in 25 cycles or less.
Strut fillet radius areas for cracks	Radial cracks that go into the inner or outer fillet radius and are less than 0.5 in. (12.700 mm), up to a maximum of two cracks.	Permitted for a reduced inspection interval of 425 hours.
	Radial cracks that go through fillet radius to the inner or outer case surfaces.	Not permitted. Remove the engine from service in five cycles or less.
Inner and outer case surfaces for cracks	Cracks less than 0.25 in. (6.350 mm) in length, up to a maximum of two cracks between any two adjacent struts, that do not go through the case.	Permitted with regular inspection interval.
	Cracks 0.25 in. (6.350 mm) - 0.5 in. (12.700 mm) in length, up to a maximum of two cracks between any two adjacent struts, that do not go through the case.	Permitted for a reduced inspection interval of 425 hours.
	Cracks of any quantity that are 0.5 in. (12.700 mm).	Not permitted. Remove the engine from service in five cycles or less.
	Cracks of any quantity that go through the inner or outer case.	Not permitted. Remove the engine from service in five cycles or less.
	U-shaped cracks where the metal can break loose.	Not permitted. Remove the engine from service in five cycles or less.
	Cracks in Area A (top three struts).	Not permitted. Remove the engine from service in five cycles or less.
Inner and outer case surfaces
Inner and outer case areas from the strut leading and trailing edges for cracks	Cracks less than 0.5 in. (12.700 mm), up to a maximum of two cracks between any two adjacent struts, that do not go through the case.	Permitted for a reduced inspection interval of 425 hours.
	Cracks of any quantity which are more than 0.5 in. (12.700 mm).	Not permitted. Remove the engine from service in five cycles or less.
	Cracks of any quantity that go through the inner or outer case.	Not permitted. Remove the engine from service in five cycles or less.
	U-shaped cracks where the metal can break loose.	Not permitted. Remove the engine from service in five cycles or less.
	Cracks in Area A (top three struts).	Not permitted. Remove the engine from service in five cycles or less.
Non-flow path areas
Dents and deformation	Any quantity that does not affect fit or function permitted.	Permitted with regular inspection interval.
TEC side of bearing housing flange in visible part of flange and flange radius.
Nicks and scratches	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted with regular inspection interval.
Cracks	Any quantity.	Not permitted. Remove the engine from service in five cycles or less.
No. 5 and 6 bearing attachment tie-rods for loose and missing tie-rods	Not permitted.	Remove the engine from service in five cycles or less.
Hub forward flow guided for evidence of Low Pressure Turbine (LPT) contact
Nicks and scratches	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted with regular inspection interval.
Cracks	Cracks less than 0.5 in. (12.700 mm), up to a maximum of two cracks.	Permitted for a reduced inspection interval of 425 hours.
Discoloration	Any quantity.	Permitted with regular inspection interval.
Hub front wall
Nicks and scratches	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted with regular inspection interval.
Cracks	Not permitted.	Remove the engine from service in five cycles or less.
Bosses on outer case for
Nicks, scratches and surface damage	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted with regular inspection interval.
Ground handling pads (4 locations)
Nicks, scratches and surface damage Loose/damaged inserts	Any quantity 0.010 in. (0.254 mm) maximum depth.	Permitted with regular inspection interval.

(6) Remove the MAT - PROTECTIVE from the inside of the engine exhaust.
(7) Examine the assembly for unwanted objects, damage and correct assembly.

5. Close-up
Subtask 72-54-00-410-105-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(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 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 72-54-00-440-070-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 72-54-00-410-104-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 13:02:03 UTC