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7. Fuel Nozzles
A. Fuel nozzles with dislodged wear sleeves or wear 5 cycles
sleeves with 4 interrupted weld designs
8. HPT nozzle
A. Leading edge missing material, from cracking or 25 cycles
burn-through, up to 0.5 in. (12.7 mm) X 0.5 in.
(12.7 mm) per vane. Maximum of 4 vanes per 90
degree arc
B. Concave surfaces of airfoil missing material, 25 cycles
from cracking or burn-through, up to 0.75 in.
(19.04 mm) diameter per vane
C. Convex side missing panel 25 cycles provided
HPT blades are
within limits
D. Inner and outer platforms missing material, from 25 cycles
cracking or burn-through, up to 0.5 in. (12.7 mm)
diameter per segment
E. Trailing edge missing material up to 0.75 in. (19 25 cycles
mm)in axial direction
F. Baffle missing material, any amount. 10 cycles
9. HPT rotor blade
A. Trailing edge cracks in Area A less than 0.2 in. 10 cycles
(5.08 mm) long
B. Trailing edge cracks and convex airfoil cracks 25 cycles
within 0.5 in. (12.7 mm) of trailing edge (10
blades maximum) in Area B less than 0.3 in. (7.62
mm) long
C. Radial tip cracks less than 0.35 in. (8.89 mm) 10 cycles
long
D. Leading edge cracks in Area A less than 0.1 in. 10 cycles
(2.54 mm) long
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E. Axial nose or gill hole cracks in Area B less 10 cycles
than 0.05 in. (1.27 mm) long
F. Radial nose or gill hole cracks in Area B less 10 cycles
than 0.06 in. (1.52 mm) long
G. Radial nose or gill hole cracks in Area C less 10 cycles
than 0.03 in. (0.76 mm) long
H. Leading edge missing material in areas A and B. 25 cycles
Any amount provided cavity 2 is not exposed (any
number of blades)
J. Airfoil distortion or evidence of burning or 25 cycles
melting (10 blades maximum)
10. HPT shroud and stage 1 low pressure turbine (LPT)
nozzle
A. HPT shrouds
(1) Circumferential cracks that connect and are 25 cycles
more than 1 in. (25.3999 mm) long.
(2) Circumferential cracks more than 0.25 in. 25 cycles
(6.3499 mm) long that connect to axial cracks
in Area B.
(3) Burn through of shroud rub land 25 cycles
B. Stage 1 LPT nozzle
(1) Cracks in all areas up to 1.4 in. (35 mm) 10 cycles
long provided not more than 2 adjacent
airfoils per segment
(2) One crack permitted on each airfoil, from 100 cycles
leading edge to trailing edge, if there is no
missing material.
(3) Burns, erosion, corrosion and missing metal 5 cycles
up to 1 in.2 (645.16 mm2) per airfoil and no
cracks extending from distressed area
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11. LPT Rotor
A. LPT blades (all stages)
(1) Blade pretwist
- Total gap, for stage 1, up to 0.1 in. (2.54 5 cycles
mm)
- Stage 2-4 gaps such that adjacent 5 cycles
interlocks, do not contact each other
(2) 0.08 in. (2.03 mm) max. deflection over a 15 cycles
length 10 times longer max, only for stage 1
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