(Continued)
Condition Maximum Serviceable Limit
Metal splatter Permitted.
SUBTASK 72-00-00-296-192-G00
(9) Use the borescope to examine the inner and the outer platform on the 1st-stage HPT nozzle
for the conditions that follow:
Condition Maximum Serviceable Limit
Cracks in the parent metal This type of damage is permitted without a quantity limit, if
no material is gone. Refer to the Continue-In-Operation
Limits.
Nicks, scores, scratches and dents on the platform surface Permitted.
Burns and erosion Permitted, if the burns are not fully through the platform.
Refer to the Continue-In-Operation Limits.
Bulges or bowing Not Permitted. Refer to the Continue-In-Operation Limits.
SUBTASK 72-00-00-296-193-G00
(10) Use the borescope to examine the first-stage shroud on the HPT nozzle for the conditions that
follow (Figure 612):
Condition Maximum Serviceable Limit
Axial cracks Permitted without a quantity limit, if the cracks are less than
0.250 inch (6.35 mm) in length. Four cracks in each segment
are permitted if the cracks are less than 1.00 inch (25.4
mm). One crack in each segment is permitted to go all the
way across the segment, if it is at least 0.125 inch (3.18 mm)
away from the other cracks. Refer to the
Continue-In-Operation Limits.
Circumferential cracks Permitted, if they are less than 0.37 inch (9.53 mm) in length
and less than 0.125 inch (3.18 mm) apart. Refer to the
Continue-In-Operation Limits.
Two cracks that are connected Permitted, if the cracks are in the limits for the axial and
circumferential cracks. More than two connected cracks are
not permitted. Refer to the Continue-In-Operation Limits.
Material that is gone (Fig. 610, 24-piece segment shroud
only)
Permitted, if the dimension of A is less than 0.100 inch (2.54
mm), and the dimension of B is less than 1.50 inch (38.1
mm). Material can be gone from each end of the segment,
but must not go into the seal slots. Refer to the
Over-Serviciable-Limit Extensions in this section.
Material that is gone (Fig. 610, 48-piece segment shroud
only)
Permitted, if the dimension of A is less than 0.100 inch (2.54
mm), and the dimension of B is less than 0.100 inch
(2.54mm). Material can be gone from each end of the
segment, but must not go into the seal slots. Refer to the
Over-Serviceable-Limit Extensions in this section.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-00-00
NoC
Page 693
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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