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(excluding fillet than 0.40 in. (10.16
and recess area) mm).
For nicks and dents, no
limit on diameter after
removal of high metal,
K. 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 002)
as regards diameter or
spacing,
L. Nicks, dents and No limited quantity if Do blending procedure
scratches on not deeper than 0.010 (Ref. TASK 72-21-00-320-
midspan shroud in. (0.25 mm). No 003)
(Area C) limited length for
scratches, and 0.5 in.
(12.7 mm) diameter for
dents. None permitted in
midspan shroud to
airfoil fillet radius.
M. Wear due to Any amount 0.005 in. Replace pair of blades
shingling on (0.13 mm) deep (Ref. TASK 72-21-00-300-
midspan shroud 002)
(Area C)
N. High metal caused Any amount after
by shingling on smoothing of high metal
midspan shroud
(Area C)
5. Abradable for:
(Ref. Fig. 601/TASK
72-23-00-991-308)
A. Cracks Any amount
B. Rubs Any amount
C. Crater (length<5x Cumulated damage more For defect above those
width) and damage than 160 in.2 (1032,25 limits :
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other than crack cm2) with no one area local reconditioning :
rub and larger than 30 in.2 (Ref. TASK 72-23-00-300-
circumferential (193,54 cm2) and : 040)
defect a) The maximum axial circular patch : R width (parallel to (Ref. TASK 72-23-00-300-R engine axis) is less 043)
than 2.5 in. (63.5 mm) refer to limits :
b) The minimum distance (Ref. TASK 72-00-00-200-
between the areas is 005)
equal to the maximum
dimension of the nearest
damaged area.
c) The fan case parent
metal does not show
through.
D. Grooves All damage is permitted For defect above those (orientated within if : limits : 0 deg. and 80 deg. a) The maximum width of local reconditioning : from engine axis one groove is not more (Ref. TASK 72-23-00-300-and length>5x than 0.32 in. (8.12 mm). 040) width) b) A maximum of total refer to limits :
width of 1.25 in. (31.75 (Ref. TASK 72-00-00-200-mm) of groove is with a 005) minimum separation of
0.1 in. (2.54 mm). c) The fan case parent metal does not show through.
E. Circumferential All damage is permitted For defect above those defect (360 deg. if : limits : or orientated a) The maximum axial local reconditioning : within 80 deg. to width (parallel to (Ref. TASK 72-23-00-300-90 deg. from engine axis) of one or 040) engine axis cumulated defect is less refer to limits : 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM ENGINE 發動機 1(144)
