R R
R R
L. Missing coating on inner faces of platform.
M. Fretting on dovetail pressure faces.
Flaking of Cu.Ni.In up See limit extension
to 10 percent is (Ref. TASK 72-00-00-200-
permitted if coating 025) and examine blades
adherence is correct in for serviceability. Make
adjacent areas and if sure that MoS2 dry film
there is no evidence of lubricant is applied to
wear on base material. disk slots, the blade
roots (dovetails), the
blade platforms and
lateral surfaces of those
platforms, and the midspan
shroud mating surfaces
before blade installation
(Ref. TASK 72-21-00-210-
004).
Flaking of Cu.Ni.In over See limit extension
10 percent and less than (Ref. TASK 72-00-00-200-
50 percent is permitted 025) and examine blades
if coating adherence is for serviceability. Make
correct in adjacent sure that MoS2 dry film
areas and if there is no lubricant is applied to
evidence of wear on base disk slots, the blade
material. roots (dovetails), the
blade platforms and
lateral surfaces of those
platforms, and the midspan
shroud mating surfaces
before blade installation
(Ref. TASK 72-21-00-210-
004) .
Any amount.
Not serviceable. Replace pair of blades
(Ref. TASK 72-21-00-300-
028).
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N. Nicks, dents and Not serviceable. Replace pair of blades scratches in (Ref. TASK 72-21-00-300-dovetail fillet 028). radius.
P. Pits. No limited quantity if Replace pair of blades not deeper than 0.005 (Ref. TASK 72-21-00-300-in. (0.13 mm). No limits 028). as regards diameter or spacing.
Q. Nicks, dents and No limited quantity if Replace blade (Ref. TASK scratches on not deeper than 0.010 72-21-00-000-007) and midspan shroud. in. (0.25 mm). No (Ref. TASK 72-21-00-400-
limited length for 007), or blend the defects scratches, and 0.5 in. (Ref. TASK 72-21-00-320-
(12.7 mm) diameter for 003) if damage is within dents. None permitted in the blending limit of midspan shroud critical figure.
(Ref. Fig. 606/TASK 72-21-00-991-314)
area. Blended fan blades must be repaired following ESM 72-21-01 Rep 01 at first shop visit opportunity.
R. Missing hard Flaking of hard coating
coating from is permitted if coating
midspan shroud not adherence is correct in
exceeding 10 adjacent areas.
percent of the
midspan shroud
mating face.
Missing hard Flaking of hard coating Monitor at every 2 "A" coating from is permitted if coating checks (800 cycles). midspan shroud adherence is correct in Remove and examine blades exceeding 10 adjacent areas. for serviceability percent but less (Ref. TASK 72-21-00-000-than 20 percent of 007). Make sure that MoS2 the midspan shroud dry film lubricant is mating face. applied to disk slots, the
blade roots (dovetails),
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the blade platforms and
lateral surfaces of those
platforms, and the midspan
shroud mating surfaces
before blade installation
(Ref. TASK 72-21-00-400-
007).
Missing hard coat Not serviceable. See limit extensions
from midspan (Ref. TASK 72-00-00-200-
shroud exceeding 025).
20 percent of the
midspan shroud
mating face.
S. Wear due to Any amount up to 0.005 Replace pair of blades
shingling on in. (0.13 mm) deep. (Ref. TASK 72-21-00-300-
midspan shroud. 028).
T. High metal caused Any amount after
by shingling on smoothing of high metal.
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