F. Localized Not serviceable. Replace blade (Ref. TASK distortion on 72-21-00-000-007) and leading and (Ref. TASK 72-21-00-400-trailing edges of 007). root area, Area A.
G. Leading and Two areas may be Do a spot fluorescent trailing edges distorted up to 0.34 in. penetrant inspection distortion in (8.64 mm) out of contour (Ref. TASK 70-51-00-230-Areas B and D (out provided there are no 002) of root area sharp corners and the trailing edge). minimum length L is six
times the depth of the distortion.
H. Blade tip (Area C)
for:
(1) Leading edge Tip curl must not extend Replace pair of blades if tip curl. more than dimension X1 = not in the limits
0.5 in. (13 mm) across (Ref. TASK 72-21-00-300-the blade tip and not 028). No continued more than dimension X = in-service extension is
0.5 in. (13 mm) along permitted. the leading edge, with maximum deflection from original contour
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(2) Trailing edge
tip curl.
dimension X1 = 0.25 in.
(6.35 mm).
A maximum of 6 blades must not have tip curl up to dimension X1 = 1.3 in. (33 mm) across the blade tip and dimension X = 2 in. (51 mm) along the leading edge with maximum deflection from original contour dimension Y = 0.6 in. (15 mm). No more than 3 blades to these increased limits can be adjacent. In all cases, deflection tip angle must not be more than 60 degrees from original airfoil.
Tip curl must not extend more than dimension Z1 =
0.5 in. (13 mm) across the blade tip and not more than dimension Z =
0.5 in. (13 mm) along the trailing edge, with maximum deflection from original contour dimension Y1= 0.25 in.
(6.35 mm).
A maximum of 5 blades must not have tip curl up to dimension Z1 = 1 in. (25.4 mm) across the blade tip and up to dimension Z = 1 in.
(25.4 mm) along the trailing edge with maximum deflection fromReplace pair of blades ifnot in the limits(Ref. TASK 72-21-00-300-028). No continuein-service extension ispermitted.
Replace pair of blades ifnot in the limits(Ref. TASK 72-21-00-300-028). No continuedin-service extension ispermitted.
Replace pair of blades ifnot in the limits(Ref. TASK 72-21-00-300-028). No continuedin-service extension ispermitted.
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(3) Nicks and dents.
J. Nicks, dents and scratches on surface of blade platform (excluding fillet and recess area).
K. Missing Molydag coating on dovetail pressure faces.
(1) Worn or missing Cu.Ni.In coating in the original contour dimension Y1= 0.3 in.
(7.62 mm). No more than 3 blades to these increased limits can be adjacent.
No limited quantity if not deeper than 0.03 in.
(0.76 mm) and no longer than 0.25 in. (6.35 mm).
For scratches: no limited quantity,if not deeper than 0.02 in.
(0.5 mm) and, not longerthan 0.40 in. (10.16mm). For nicks and dents, no limit on diameter after removal of high metal.
Missing Molydag coatingis permitted on 100percent of the surfaceif parent material is not damaged.
Any amount if parentmaterial is not damaged.
Replace blade (Ref. TASK72-21-00-000-007) and(Ref. TASK 72-21-00-400-007), or blend the defects (Ref. TASK 72-21-00-320-003) if damage is within the blending limit of figure. (Ref. Fig. 606/TASK 72-21-00-991-314) Blended fan blades must be repaired following ESM 72-21-01 Rep 01 at first shop visit opportunity.
Do blending procedure(Ref. TASK 72-21-00-320-003).
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non-contact area (Area 1).
(2) Worn or missing Cu.Ni.In coating in the contact area (Area 2) of the dovetail pressure face.
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