ABX 001-007, 011, 012, 016-019, 021, 022, 025, 101, 109, 114, 115, 314-999; ENGINES WITHOUT CHECK
VALVES (Continued)
1) The fan rotor can be turned freely by hand.
2) The cause of the failure condition is corrected.
3) At the next rotor overhaul, do the overtemperature inspection of the LPT rotor stage
1 and 2 disks, stage 2 HPT disks, and stage 2 HPT blade retainer (Ref GE Engine
Manual).
(d) If the airplane was operated for more than 12 cycles with a cooling air decrease, it can
continue in operation for 50 more flight cycles, if:
1) The fan rotor can turn freely by hand.
2) The cause of the failure condition is corrected.
3) At the next engine removal, do the steps that follow:
a) Do the overtemperature inspection of the LPT rotor stage 1 and 2 disks, and
the HPT stage 2 disks.
b) Replace the HPT stage 2 blade retainer (discard the old retainer).
(e) If you do not know the number of cycles the airplane has flown with a cooling air
decrease, do the steps that follow:
1) If there has been only one cooling air decrease since the last LPT overhaul, the
engine can continue in operation for 50 more flight cycles if:
a) The fan rotor will turn freely by hand.
b) The cause of the failure condition is corrected.
c) At the next engine removal, do the steps that follow:
<1> Do the overtemperature inspection of the LPT rotor stage 1 and 2 disks,
and the HPT stage 2 disks.
<2> Replace the HPT stage 2 blade retainer (discard the old retainer).
2) If there have been two or more cooling air decreases since the last LPT overhaul,
the engine may continue in operation to a maintenance base if:
a) The fan rotor turns freely by hand.
b) The cause of the failure condition is corrected.
c) Remove the engine at the maintenance base.
<1> Do the overtemperature inspection of the LPT rotor stage 1 and 2 disks,
and the HPT stage 2 disks.
<2> Replace the HPT stage 2 blade retainer (discard the old retainer).
ABX 001-007, 011, 012, 016-019, 021, 022, 025, 101, 109, 114, 115, 314-999; ENGINES WITH CHECK
VALVES
SUBTASK 72-00-00-216-137-G00
(2) If there was a decrease in cooling air from the cooling air system, do the steps that follow:
NOTE: The cooling air system is the clamps, tubes, and manifolds which supply the stage 7
compressor air from the stator case manifolds to the low pressure stage 1 nozzles.
(a) Examine the tubes for open cracks or material that is gone.
1) If the total damage area is more than 0.25 square inch (160 square mm), replace
the tube.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-00-00
NoC
Page 669
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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