(c) Push the borescope through the plastic guide tube until the tip comes out of the end of the tube.

 (d) Push the tip of the borescope between the nozzle vanes by using the tip deflection control.

 (e) Turn on the light source of the BORESCOPE - LIGHT SOURCE SET (856A1322 P03 or P04).

 (f) Adjust the borescope equipment to get maximum clarity of view.

 (9) 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 CCW.

 (10) Inspect the HPT blades (from the front) 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.
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 NOTE : Crack indications which are not completely identified may be

____ sprayed with solvent (CP2011) or an equivalent substitute to remove light engine deposits.
 NOTE : When a HPT blade has impact damage, you must do a 360 degree
____ combustor borescope inspection to look for combustor distress (Ref. TASK 72-42-00-290-005).
 NOTE : For purposes of estimating the size of any distress, the
____ radial spacing of the trailing edge slots is approximately 0.1 in. (2.55 mm) .
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Leading edge for:
 A. Axial and radial Any number 0.05 in. See limit extensions
 cracks in area A.  (1.27 mm) long if they (Ref. TASK 72-00-00-200-do not connect more than 025). 2 holes.
 B. Axial and radial  Not serviceable.
 cracks in areas B
 and C, including
 root radius not
 intersecting nose
 or gill holes.

 C. Nicks and dents in  Any amount.
 area A.

 D. Nicks and dents in  Any amount.
 area B.

 E. Nicks and dents in  3 permitted, 0.05 in.
 area C, including (1.27 mm) long. Nicks
 root radius. and dents must be

 separated by 0.125 in.
 (3.17 mm) minimum.
 F. Axial nose or gill  Not serviceable. See limit extensions hole cracks, areas (Ref. TASK 72-00-00-200-B and C. 025).
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 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
G. Radial nose or  None allowed in area C,  See limit extensions
 gill hole cracks,  one permitted, 0.03 in.  (Ref. TASK 72-00-00-200-
areas B and C.  (0.76 mm) long in area  025).
 B.
 H. Dirt or  Any amount.
 environmental
 build-up.
 J. Missing material  Any amount provided  See limit extensions
 in areas A and B.  cavity 2 not exposed  (Ref. TASK 72-00-00-200-
(max 2 blades per  025).
 engine). Repeat the
 inspection within 100
 hours.
 K. Missing material  Not serviceable.
 in area C.
 L. Missing thermal  Any amount.
 barrier coating.
 2. Blade tip for:

 NOTE : There are 2 notched blades in the HPT rotor to show the amount of
____
 blade tip rubbing. If the notches can or cannot be seen, the
 condition is serviceable.

 A. Radial cracks on  Any number up to 0.15  See limit extensions
 convex side not  in. (3.8 mm) max radial  (Ref. TASK 72-00-00-200-
within 0.50 in.  length.  025).
 (12.7 mm) of
 trailing edge.
 B. Radial cracks on  Any number up to 0.7 in.  See limit extensions
 concave side not  (17.8 mm) max length.  (Ref. TASK 72-00-00-200-
within 0.50 in.  025).
 (12.7 mm) of
 trailing edge.

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