(b) Nicks, dents, and scratches on the contour surfaces of the root area and area C are
permitted if they are less than 0.003 inch (0.08 mm) in depth.
(c) Nicks, dents, and scratches on the leading and trailing edges of the root area and area C
are permitted if they are less than 0.020 inch (0.51 mm) in depth.
(d) The limits for nicks, dents, and scratches on the leading and trailing edges in all areas
other than the root area and area C are as follows:
1) They are permitted if they are less than 0.060 inch (1.52 mm) in depth and are
located on the outer panel.
2) They are permitted if they are less than 0.040 inch (1.0 mm) in depth and are
located on the inner panel.
3) Scratches are permitted if they are less than 0.50 inch (13 mm) in length (after the
high metal has been removed).
(e) Fan blade tips (trailing edge) that rub or catch against the fan case shroud:
1) Tips that catch or rub are permitted, if the blades satisfactorily complete all other
blade inspection specifications (paragraph 2.B)
2) There is no limit to the number of the blade tips that rub or catch against the shroud.
3) Discoloration resulting from tip rub, any amount provided there are no cracks in the
airfoil.
(f) Tip curl is permitted on both corners of the blade tip if the conditions that follow are met:
1) The tip curl must measure less than 0.50 inch (13 mm) on the leading or trailing
edge of the blade tip.
2) Deflection of the tip curl must be less than 0.250 inch (6.35 mm) from the initial tip
contour.
3) A maximum of five blades can have the conditions that follow:
a) Tip curl that measures less than 1.5 inches (38 mm) across the blade tip.
b) Leading or trailing edge deflection from the initial contour must be less than
0.30 inch (7.62 mm).
(g) Nicks and dents on the blade tip are permitted if they are less than 0.060 inch (1.52 mm)
in depth and 0.250 inch (6.35 mm) in length.
(h) Nicks, dents, and scratches on the contour surfaces in all areas other than the root area
and area C are permitted if they are less than 0.020 inch (0.51 mm) in depth.
1) Scratches must be less than 0.50 inch (12.7 mm) in length.
2) The diameter of nicks and dents is not limited (after high metal has been removed).
(i) Nicks, dents, and scratches on the top surface of the blade platform (not the fillet) are
permitted if they are less than 0.030 inch (0.76 mm) in depth.
1) Scratches must be less than 0.50 inch (12.7 mm) in length.
2) The diameter of nicks and dents is not limited after the removal of high metal.
(j) Fretting on the side edges of the platform is permitted if it is less than 0.015 inch (0.38
mm) in depth.
(k) No nicks, dents, or scratches are permitted on the hard-coat surface of the mid-span
shroud.
(l) For mid-span shroud areas other than the hard coat surfaces, nicks, dents, and scratches
are permitted if they are less than 0.010 inch (0.25 mm) in depth.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-31-02
NoC
Page 608
D633T1B7 Dec 22/2016
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ABX 001-007, 011, 012, 016-019, 021, 022, 025, 101,
109, 114, 115, 314-999
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