Condition Maximum Serviceable Limit
Cracks Not Permitted.
Dents Permitted, if the dent diameter is less than the span between four trailing edge holes
or 0.140 inch (3.56 mm). No trailing edge holes can be closed by the dent.
(d) Examine the concave surfaces of the rotor blades on the stage 1 HPT for the conditions
that follow:
Condition Maximum Serviceable Limit
Cracks, holes, tears, or metal that is
gone from the trailing edge face
Not permitted.
Holes, tears and metal that is gone Not Permitted.
Radial cracks from the bottom of the
film cooling holes
Permitted, if they are less than 0.05 inch (1.27 mm) in length. Refer to the
Continue-In-Operation Limits.
Radial cracks not from the bottom of
the film holes (also not in the tip)
Not permitted.
Nicks and dents in area 'A' and 'B'
(damage from a hit)
Permitted, if they are less than 0.250 inch (6.35 mm) in diameter. There must be
no tears, cracks, holes or material that is gone.
Axial cracks Not permitted. Refer to the Continue-In-Operation Limits.
Surface cracks near the tip Permitted within the repair area (the repair area has a different color)
(e) Examine the convex surfaces of the rotor blades on the stage 1 HPT for the conditions
that follow:
Condition Maximum Serviceable Limit
Cracks, holes, or metal that is gone
from the face of the trailing edge
Not permitted.
Cracks in the airfoil, not from a hit
(also not in the tip area)
Not permitted. Refer to the Continue-In-Operation Limits.
Dents and cracks from a hit in area 'A' Permitted, if there are no holes or tears. The cracks must have a length less than
0.120 inch (3.05 mm) (the distance between the convex film holes).
Holes from a hit in area 'A' Not permitted. See the Continue-In-Operation Limits.
Surface cracks near the tip Permitted, within the repair area (the repair area has a different color).
(f) Examine the tip area (above the tip film holes) of the rotor blades on the 1st-stage HPT
for the conditions that follow:
Condition Maximum Serviceable Limit
Radial cracks that start at the tip Radial cracks are permitted on the concave side if they do not extend below the
second gill hole on the tip.
Radial cracks are permitted on the convex side if they do not extend below the
third gill hole from the tip.
Radial cracks in the leading or trailing edge that do not extend below the tip
area are permitted.
There must be no material that is gone.
Cracks Permitted, if they are only in the tip area.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-00-00
NoC
Page 615
D633T1B7 Aug 22/2017
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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