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more than 0.128 in. (3.25 mm) radial and
0.039 in. (0.99 mm) axial
(3) Distortion of T/E and L/E: any number, if the length L is no more than 1 in. (25.4mm) and the maximum dimension X along the chord width is not more than 0.492 in. (12.5mm)
(4) Nicks, dents, scratches for areas A and B ; any number, less than 0.157 in. (3.99 mm) in diameter, protrusion permitted
(5) Nicks, dents, scratches for area C: any number, less than 0.295 in. (7.49 mm) in diameter, protrusion permitted
(6) Nicks, dents, scratches L/E and T/E maximum axial length less than 0.118 in. (2.99 mm) in diameter
(7) Cracked inner shroud: Maximum of 4 cracks extending from the L/E to the T/E of the inner shroud (passing through a recess) are permitted if there is a minimum separation of 3 non-cracked vane recesses between 2 cracked recesses.
A sound check (see note below) done on the vanes at, and adjacent to the cracked inner shroud area, must demonstrate no difference in tonality.
50 cycles/75 hours
10 cycles/15 hours
50 cycles/75 hours
20 cycles/30 hours
3000 hours/"C"check
This extension maybe used againindefinitely inintervals of 3000 hours as long as there is no further deterioration of these conditions.
NOTE : Sound
____ Tonality Check Recommendati A sound tonality check must be done to
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detect if the abradable material inside the inner shroud is still in contact with the root of the vane. Use a smooth-ended cylindrical tool made of steel with diameter of approximatel
0.5 in. (12.6999 mm). (For example, a ratchet wrench extension bar). Tools made of aluminium, plastic or wood do not permit the detection of significant variation in the sound tone from one vane to the next. Removal of 2 or 3 fan blades gives a better accessibilit to do the check.
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Be careful to not use a tool or excessive force during the check. This would damage the vanes.
Do the check on an area including 3 or 4 vanes on each side of the vane where the cracked inner shroud is located. Place the tool on the leading edge mid-span of the couterclockw most vane. Lightly stroke the vane and subsequent vanes in the clockwise direction using a constant speed. Note any variations in the sound tone from one vane to the next. If there is a
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