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B. Axial cracks.
C. Burns and bulges.
R R R D. Missing Thermal Barrier Coating (TBC)
4. Trailing edge of vane airfoil for:
A. Axial cracks starting from slots adjacent to trailing edge
B. Burns and cracks.
C. Buckling or bowing
D. Missing material (loss of metal).
5. All areas of airfoil for:
A. Craze cracking.
Any number; no missing material
Any number; no missing material
Any amount.
Any number.
Any number.
Any amount.
Total area removed from trailing edge not to be more than 0.5 in. (12.7 mm) in axial direction.
Any amount.
See limit extension(Ref. TASK 72-00-00-200-025).
See limit extension(Ref. TASK 72-00-00-200-025).
See limit extension(Ref. TASK 72-00-00-200-025).
NOTE : Craze cracking looks like many surface cracks that have no visual
____
width or depth.
B. Nicks, scores, Any number.
scratches and
dents.
C. Metal splatter. Any amount.
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6. Inner and outer platform for:
A. Cracks in parent Any number.
metal.
B. Missing metal or No through holes, but See limit extensions burning of parent any amount of missing (Ref. TASK 72-00-00-200-metal. material from cracking 025).
or burning is permitted.
C. Nicks, scores, Any amount.
scratches and
dents on platform
surface.
D. Bulging and Any amount.
bowing.
E. Cracks in platform Any amount, no
braze joint. separation of braze
joint allowed unless
caused by burning.
(1) When the inspection is complete, turn off the light source and remove the borescope and the guide tube.
(2) If any defects are found then remove additional borescope plugs and the spark igniters to inspect all of the HPT nozzle assembly.
Subtask 72-51-00-010-060
C. Remove parts before borescope inspection.
(1) Remove the drain tube from the fuel nozzle adjacent to the 6 o'clock borescope plug.
NOTE : If you remove the drain tube from the fuel nozzle adjacent to
____ the 6 o'clock borescope plug, you will be required to perform a leak check after this inspection. Use the 6 o'clock borescope port only if necessary.
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(2) Remove the borescope plugs from the approximate 1 and 6 o'clock positions.
(3) Remove both spark igniters (Ref. TASK 74-21-30-000-002)
Subtask 72-51-00-290-055
D. Do a borescope inspection.
(1) Repeat paragraph 4.B.(1) thru (6) for each borescope and spark igniter location.
Subtask 72-51-00-410-055
E. Install parts removed for borescope inspection.
CAUTION : BE SURE TO INSTALL THE CORRECT BORESCOPE PLUGS. THE COMBUSTOR
_______ BORESCOPE PLUGS DO NOT HAVE A STEM FEATURE. INADVERTENT INSTALLATION OF BORESCOPE PLUGS WITH STEMS FROM OTHER LOCATIONS WILL RESULT IN THE STEM FEATURE BEING BURNED AWAY BY COMBUSTION GASES.
R (1) Apply a small amount of graphite grease (Material No. CP2101) or R Never Seez-Pure Nickel, Special (Material No. CP2619) to the R borescope plug threads and pressure faces.
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