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E E
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E E
(1) Piece missing:
any number in area G, at leading edge and 50 cycles/75 hours
trailing edge tip corners, 0.8 in. (20 mm)
radial and 0.5 in. (12.5 mm) axial
(2) Cracks and tears in area G, 0.8 in. (20 mm) 50 cycles/75 hours
from tip : any number less than 0.8 in. (20
mm) radial and less than 0.492 in. (12.5 mm)
axial
(3) Wear or local distortion of T/E and L/E tips 100 cycles/150
if less than 15 blades 0.984 in. (25 mm) hours
radial and 0.59 in. (15 mm) axial
(4) Nicks, dents, scratches for area E: any 50 cycles/75 hours
number, less than 0.059 in. (1.5 mm) in
diameter, protrusion acceptable, not thru
(5) Nicks, dents, scratches for airfoil out of 50 cycles/75 hours
area E, not L/E and T/E: any number, less
than 0.236 in. (6 mm) in diameter, protrusion
acceptable
(6) Nicks, dents, scratches out of area E on L/E 50 cycles/75 hours
and T/E: maximum axial length less than 0.059
in. (1.49 mm)
(7) Distorted L/E and T/E, out of area E maximum 50 cycles/75 hours
circumference equals 0.275 in. (6.98 mm)
radial length equals 0.708 in. (17.98 mm)
E. Booster vanes (stage 1 only) for:
(1) Piece missing: 50 cycles/75 hours
maximum 20 blades more than 0.256 in. (6.5
mm) axial, 0.728 in. (18.49 mm) radial, no
cracks starting from damage area allowed in
areas"A" and "B"
(2) Cracks and tears in area C, any number, more 10 cycles/15 hours
than 0.256 in. (6.5 mm) radial and 0.078 in.
(1.98 mm) axial. In areas A and B, any number
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more than 0.128 in. (3.25mm) radial and 0.039 in. (0.99 mm) axial
(3) Distortion of T/E and L/E: any number, if the 50 cycles/75 hours length L is not more than 1 in. (25.4 mm) and the maximum dimension X along the chord width is not more than 0.492 in. (12.5 mm).
(4) Nicks, dents, scratches for areas A and B ; 10 cycles/15 hours any number, less than 0.157 in. (3.99 mm) in diameter, protrusion permitted
(5) Nicks, dents, scratches for area C: any 50 cycles/75 hours number, less than 0.295 in. (7.49 mm) in diameter, protrusion permitted
(6) Nicks, dents, scratches L/E and T/E maximum 20 cycles/30 hours axial length less than 0.118 in. (2.99 mm) in diameter
(7) Cracked inner shroud: 3000 hours/"C" Maximum of 4 cracks extending from the L/E to check 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 This extension may vanes at, and adjacent to the cracked inner be used again shroud area, must demonstrate no difference indefinitely in in tonality. intervals of 3000
hours as long as there is no further deterioration of these conditions.
NOTE : Sound Tonality Check Recommendation
____ A sound tonality check must be done to 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 approximately 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
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