(5) Put the rigid borescope of the BORESCOPE KIT (856A1320 P04 or P05) into the borescope port and turn on the light source of BORESCOPE -LIGHT SOURCE SET (856A1322 P03 or P04).
Subtask 72-52-00-290-055
B. Do a borescope inspection:
(1) Look at the trailing edge, tip concave and convex side of the HPT blades as follows:
(a) Adjust the borescope equipment to obtain maximum clarity of view.
(b) Turn the HPT rotor CW (aft looking forward). Stop the rotor at each blade to make sure all of the defects can be seen.
NOTE : To turn the HPT rotor CW, the rotation pad drive must be
____ turned counterclockwise (CCW).
(c) Inspect the HPT blades (from the rear) and use the limits that follow:
NOTE : It is not easy to visually tell when cooling holes are
____ plugged. Cooling holes which are apparently plugged are permitted if any cracking, erosion or burning is within serviceable limits.
NOTE : Crack indications which are not completely identified may
____ R be sprayed with stoddard solvent (Material No. CP2011) or R acetone (Material No. CP1039) or isopropyl alcohol R (Material No. CP1041) or ardrox 552 (Material No. CP2559) R or turco ind 79 (Material No. CP2560) or mag-chem teksol R (Material No. CP2566) or degreasol 99 R (Material No. R CP2584) or mag-chem skysol (Material No. CP2656) or an R equivalent substitute to remove light engine deposits.
NOTE : If a HPT blade has impact damage, you must do a 360-degree
____ combustor borescope inspection to look for combustor distress (Ref. TASK 72-42-00-290-041) and inner cowl bolts (Ref. TASK 72-42-00-290-007).
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NOTE : For the purposes of estimating the size of any distress,
____ the radial spacing of the trailing edge slots is approximately 0.1 in. (2.54 mm).
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1. Trailing edge for:
NOTE : Casting core
____ lines are permitted.
A. Cracks in area B and C including root filet. Make sure that discoloration, scratches or marks are not seen as cracks.
B. Cracks in area A.
C. Missing material. Burning, or holes in tip and area A.
D. Missing thermal barrier coating.
E. Plugged air passages in area
C.
F. Plugged air passages in area
B.
For a crack up to 0.12 in. (3.0 mm) in length, the maximum reinspection interval is 400 cycles.For a crack more than
0.12 in. (3.0 mm) and upto 0.20 in. (5.1 mm) inlength, the maximum reinspection interval is 200 cycles.
One permitted, 0.10in.
(2.54 mm) long.
No limit, as long as the missing material is not more than 0.50 in. x
0.50 in. (12.7 mm x 12.7 mm).
Any amount.
Not serviceable.
One permitted.
See limit extensions(Ref. TASK 72-00-00-200-025).
See limit extensions(Ref. TASK 72-00-00-200-025).
See limit extensions(Ref. TASK 72-00-00-200-025).
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G. Plugged air passages in area
A.
H. Nicks and dents, area A.
J. Nicks and dents, areas B, C, and root fillet.
K. Bent material at the tip, areas B or C.
2. Blade tip for:One permitted.
Any amount, if there areno cracks or torn metal.
No limit, as long as thenicks and dents are notmore than 0.05 in. (2.5 mm) long.
Any amount.
NOTE : There can be 2 or 4 notched blades in the HPT rotor that are used to
____ show blade tip wear. The blade tip wears as it rubs against the shroud. The number of notches that can be seen is an indication of tip wear. It is possible that all tip notches can be gone because of wear. Missing notches have no effect on the serviceable condition of
the blade.
A. Radial cracks on Any number up to 0.15
convex side not in. (3.81 mm) long.
within 0.5 in.
(12.7 mm) of
trailing edge.
B. Radial cracks on Any number up to 0.7 in.
concave side not (17.78 mm) long.
within 0.5 in.
(12.7 mm) of
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