AD NUMBER: 2008-09-10
MANUFACTURER: Air Tractor
SUBJECT: Airworthiness Directive 2008-09-10 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) to supersede AD
2003-06-01, which applies to all Air Tractor, Inc. (Air Tractor)
Models AT-300, AT-301, AT-302, and AT-400A airplanes that have
aluminum spar caps; certain Air Tractor Models AT-400 airplanes
that have aluminum spar caps; and all Models AT-300 and AT-301
airplanes that have aluminum spar caps and are or have been
converted to turbine power. AD 2003-06-01 requires replacing the
wing spar lower caps at a specified safe life limit; allows
extending the safe life limit on certain airplanes if a wing lower
spar cap splice rework is done; allows a limited time of continued
operation beyond the safe life limit provided parts are ordered,
the replacement is scheduled, and repetitive inspections reveal no
cracks; and requires a report of any cracks found during any
inspection to the FAA. This AD results from a recent report of
cracks found on a Model AT-301 airplane at hours below the
modification time specified in AD 2003-06-01. Consequently, this AD
retains the wing spar lower cap replacement and reporting
requirements from AD 2003-06-01 and adds a repetitive eddy-current
inspection. We are issuing this AD to detect and correct cracks in
the wing centerline splice joint. If not detected and corrected,
these cracks could result in the wing separating from the airplane
during flight.
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