Sun, Feb 06, 2011
AD NUMBER: 2011-02-07
MANUFACTURER: General Electric Company CF6-45
and CF6-50 Series Turbofan Engines
SUBJECT: Airworthiness Directive 2011-02-07
SUMMARY: This AD supersedes an existing
airworthiness directive (AD) for General Electric Company (GE)
CF6-45 and CF6-50 series turbofan engines with certain low-pressure
turbine (LPT) rotor stage 3 disks installed. That AD currently
requires initial and repetitive borescope inspections of the
high-pressure turbine (HPT) rotor stage 1 and stage 2 blades for
wear and damage, including excessive airfoil material loss. That AD
also requires fluorescent-penetrant inspection (FPI) of the LPT
rotor stage 3 disk under certain conditions and removal of the disk
from service before further flight if found cracked. That AD also
requires repetitive exhaust gas temperature (EGT) system checks
(inspections). This AD requires HPT rotor stage 1 and stage 2 blade
inspections and EGT system inspections. This AD also requires FPI
of the LPT rotor stage 3 disk under certain conditions, removal of
the disk from service before further flight if found cracked, and
an ultrasonic inspection (UI) of the LPT rotor stage 3 disk forward
spacer arm. This AD also requires initial and repetitive engine
core vibration surveys and reporting to the FAA any crack findings,
disks that fail the UI, and engines that fail the engine core
vibration survey.
This AD was prompted by reports received of additional causes of
HPT rotor imbalance not addressed in AD 2010-12-10, and two
additional LPT rotor stage 3 disk events. The FAA is issuing this
AD to prevent critical life-limited rotating engine part failure,
which could result in an uncontained engine failure and damage to
the airplane.
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