CONDITION CONTINUE-IN-OPERATION LIMIT
Cracks in the case welds or the parent metal. The cracks are less than 4.0
inch (101.6 mm). The open area is less than 0.5 square inch (322 square
mm).
25 flight cycles
Cracks in the boss pads that are less than 4.0 inch (101.6 mm). The open
area is less than 0.5 square inch (322 square mm)
25 flight cycles
(b) LPT Aft Casing
CONDITION CONTINUE-IN-OPERATION LIMIT
Radial flange cracks, less than 4 cracks on each flange. Each crack is less
than 0.25 inch (6.35 mm) into the casing.
25 flight cycles
Cracks in the case welds or the parent metal. The cracks are less than 4.0
inch (101.6 mm), and do not go into the flange.
25 flight cycles
(c) LPT Rotor
CONDITION CONTINUE-IN-OPERATION LIMIT
1st - 4th Stage blade damage from a hit. There is no material that is gone,
and the cracks are less than 50 percent of the chord width (in the outer half
of the blade). The cracks are less than 25 percent of the chord width (in the
inner half of the blade).
10 flight cycles
(d) Core (N2)
CONDITION CONTINUE-IN-OPERATION LIMIT
Overspeed condition - 110.6 % (10869 rpm) to 117.0 % (10976 rpm) 10 flight cycles
SUBTASK 72-00-00-866-092-G00
(5) The Continue-In-Operation Limits for the Accessory Drive follow:
(a) Accessory Gearbox (AGB)
CONDITION CONTINUE-IN-OPERATION LIMIT
Oil leakage from the magnetic carbon seal (preformed packing) in the AGB
drive pads.
10 flight cycles. Make sure the seal drain
line is disconnected from the AGB drain
module and the port has a plug.
NOTE: As soon as possible, replace the
magnetic carbon seal. Remove the drain line
plug, and connect the drain line to the AGB.
SUBTASK 72-00-00-716-145-G00
(6) EGT Thermocouple Probe
(a) If there is damage to the thermocouple harness pigtail leads, do the EGT indicating
system inspection and continue-in-operation limits (TASK 77-21-00-206-004-G02).
G. Fan (N1) Overspeed Inspection
SUBTASK 72-00-00-216-055-G00
(1) If the fan was operated at speeds from 117.0% (4016 rpm) to 125.0% (4290 rpm), refer to the
FIM 71-05-00-1.
SUBTASK 72-00-00-026-056-G00
(2) If the fan was operated at speeds above 125.0% (4290 rpm), do the steps that follow:
(a) Replace the engine (TASK 71-00-02-004-004-G00 and TASK 71-00-02-404-233-G00).
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-00-00
NoC
Page 658
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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
To Next Page
Loading...
