Borescope Inspection of the Turbine Intermediate Case (TIC) Assembly [PW11]

TASK 72-52-00-290-802-A
Borescope Inspection of the Turbine Intermediate Case (TIC) 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.

ZONE: 400

1. Reason for the Job
Use this procedure to borescope inspect the Turbine Intermediate Case (TIC) vane assembly gas path area for burning and damage.
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	THERMOMETER - METAL PROBE TYPE, 0 TO 400 DEG.F
CTE8003	1	SYSTEM BOROSCOPE (VIDEO)
PWA110092	1	GUIDE, BORESCOPE - ENGINE ASSY, TURBINE INTERMEDIATE C

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-817-A	Motor the Engine (Dry Method)
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 72-00-00-000-804-A	Removal of the Borescope Plugs
TASK 72-00-00-290-811-A	Borescope Inspection of the Engine
TASK 72-00-00-400-804-A	Installation of the Borescope Plugs
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
Borescope Inspection of the Turbine Intermediate Case (TIC) Assembly

3. Job Set-up
Subtask 72-52-00-941-057-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 72-52-00-010-062-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 the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 72-52-00-040-056-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 72-52-00-010-063-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 72-52-00-290-056-A ** ON A/C NOT FOR ALL

A. Borescope Inspection of the TIC Assembly

WARNING: DO THE BORESCOPE INSPECTION IN AN AREA WHICH HAS PROTECTION FROM THE WEATHER. IF A BORESCOPE INSPECTION IS DONE IN WET CONDITIONS, USE SUFFICIENT PROTECTION TO PREVENT POSSIBLE ELECTRICAL SHOCK TO THE OPERATOR OR DAMAGE TO THE EQUIPMENT. AN ELECTRICAL SHOCK CAN KILL A PERSON OR CAUSE A BAD INJURY.

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

CAUTION: MAKE SURE THAT THE TEMPERATURE IN THE ENGINE IS LESS THAN 150 DEG.F (65.6 DEG.C) BEFORE YOU INSTALL THE FLEXIBLE BORESCOPE. IF THE CASES ADJACENT TO THE BORESCOPE PORT ARE SUFFICIENTLY COOL TO LET YOU TOUCH THEM, IT IS A SIGN THAT YOU CAN DO THE BORESCOPE INSPECTION. HIGH TEMPERATURES CAN CAUSE DAMAGE TO THE BORESCOPE.

(1) Operation intervals:
(a) See the Pratt & Whitney engine maintenance program for recommended intervals for each engine module.
(b) These inspection intervals can be adjusted based on operator experience and approval of the local regulatory agency.
(c) Operation at regular inspection interval limit:
1 If parts damage meets regular inspection criteria, the engine can continue in service.
2 The parts will be examined again at the next regular inspection interval.
(d) Operation at a reduced inspection interval limit:
1 If the parts are damaged to the reduced inspection interval limits, the engine can continue in service as noted in the inspection procedure.
a The parts must be examined again at the reduced inspection interval.
b The reduced interval is 1/2 the regular interval, unless specified differently.
c Contact Pratt & Whitney for further disposition.
(e) Operation at an additional reduced inspection interval limit:
1 If the parts are damaged to the additional reduced inspection interval limits, the engine can continue in service as noted in the inspection procedure.
a The parts must be examined again at the reduced inspection interval.
b Reduced interval is 1/4 the regular interval, unless specified differently.
c Contact Pratt & Whitney for further disposition.
(f) Operation at more than the additional reduced inspection interval limit:
1 If the parts are damaged more than the additional reduced inspection interval limits, the engine cannot continue in service for more than five additional flight cycles unless otherwise specified in the inspection procedure for the parts.
2 The engine must be disassembled for repair or replacement of the damaged parts.
(2) Perform the initial set-up for the borescope inspection:

NOTE: It is recommended that you wait a period of three to five hours after engine shutdown before you do this borescope inspection.

(a) For borescope inspection procedures and access port locations (Ref. AMM TASK 72-00-00-290-811).
(b) Remove the access port TIC-1 borescope access plug from the turbine intermediate case (Ref. AMM TASK 72-00-00-000-804).
(3) If the engine has been operated recently, check the engine temperature with the THERMOMETER - METAL PROBE TYPE, 0 TO 400 DEG.F.
(a) The engine temperature must be less than 150 deg.F (66 deg.C).
(b) You can dry-motor the engine with the starter to decrease the engine core temperature (Ref. AMM TASK 71-00-00-860-817).
(4) Do the inspection with the CTE8003 SYSTEM BOROSCOPE (VIDEO). You can use the PWA110092 GUIDE, BORESCOPE - ENGINE ASSY, TURBINE INTERMEDIATE C.

NOTE: To see all areas of the TIC vane assembly, it can be necessary to do a 360 degrees loop over the top of the leading edge and a 360 degrees loop over the top of the trailing edge. To access the trailing edge area, it can be necessary to use the TIC borescope guide.

(5) Install the flexible borescope through the access port TIC-1 for examination of the gas path areas of the turbine intermediate case vane assembly.
(6) Examine the forward areas of the vane assembly, which includes the inner and outer platform areas and the airfoil walls for burn-through and damage.
(a) Refer to Table 1 for the permissible limits.

Borescope Inspection of the Turbine Intermediate Case (TIC) Assembly ** ON A/C NOT FOR ALL

(7) Examine the rear areas of the vane assembly which includes the inner and outer platform areas and the airfoil walls for burn-through and damage.
(a) Refer to Table 1 for permissible limits.
(8) Examine the piston ring seals for jamming or wear. Refer to Table 1 for the permissible limits.

Borescope Inspection of the Turbine Intermediate Case (TIC) Assembly ** ON A/C NOT FOR ALL

EXAMINE	DAMAGE	DISPOSITION
All coated gaspath surfaces for cracks	Any quantity in coating only without burning or burn-through less than 1 in. (25.4 mm).	Permitted with regular inspection interval.
	Any quantity in coating only without burning or burn-through more than 1 in. (25.4 mm).	Not permitted. Remove the engine from service in five cycles or less.
	Any quantity thru-wall or with burning or burn-through terminating on the free edge more than 0.125 in. (3.175 mm).	Not permitted. Remove the engine from service in five cycles or less.
	Any quantity thru-wall or with burning or burn-through NOT terminating on the free edge more than 0.375 in. (9.525 mm).	Not permitted. Remove the engine from service in five cycles or less.
All coated gaspath surfaces with burn-through	Any quantity of burn-through less than 0.375 in. (9.525 mm).	Not permitted. Remove the engine from service in five cycles or less.
	Any quantity of burn-through more than 0.375 in. (9.525 mm).	Not permitted. Remove the engine from service immediately.
All coated gaspath surfaces for missing coat	All quantities of missing coat with no burning or erosion.	Permitted with regular inspection intervals.
	Missing coat with burning or erosion.	Contact Pratt & Whitney.

Table - Borescope Inspection of Turbine Intermediate Case - Continue-in-Service Damage Limits

NOTE: If forward inner platform leading edge cracks are visible, additional borescope inspection is required.

(9) After the completion of the borescope inspection of the TIC, remove the CTE8003 SYSTEM BOROSCOPE (VIDEO), power cables and equipment from the engine.
(10) If the HPT-1 or TIC-1 borescope plug sleeve is damaged, replace it (Ref. AMM D/O 72-51-02-96).
(11) Install the access port TIC-1 borescope access plug on the TIC (Ref. AMM TASK 72-00-00-400-804).
(12) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 72-52-00-410-062-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 right thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR.

Subtask 72-52-00-440-056-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 72-52-00-410-063-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:49:42 UTC