Tue, Dec 14, 2010
Structural Failure In A Wing Occurred During A Production
Acceptance Flight Test
The FAA has issued an emergency AD (2010-26-53) for Cessna
LC41-550FG and LC42-550FG (Corvalis) airplanes.
Cessna 400 Corvalis TT
The emergency AD was prompted by a Cessna Model LC41-550FG (400
Corvalis TT) that suffered a significant structural failure in
the wing during a production acceptance flight test. The wing skin
disbonded from the upper forward wing spar. The length of the
disbond was approximately 7 feet. This condition, if not corrected,
could result in catastrophic failure of the wing due to disbonding
of the wing skin from the wing spar. The FAA says they are
evaluating this situation and may take additional AD action as
necessary.
The AD was issued after the FAA evaluated of all the
relevant information, and determined the unsafe condition described
previously is likely to exist or develop in other products of the
same type design.
Note: A Cessna spokesman states that the
Emergency AD covers only eight aircraft and none are flying in the
field. Six are either Cessna demonstrators or undelivered, while
the only aircraft delivered is being modified for flight to the
Pacific Rim and is not flying, and the other is having its wing
replaced due to damage sustained in a ground accident.
The AD requires owners to obtain written approval to operate the
airplane from the Manager, Wichita Aircraft Certification Office
(ACO). This written approval must clearly state that operation is
approved per Emergency AD 2010-26-53. The airplanes may not be
operated without the written approval.
A special flight permit also requires written approval from the
Manager, Wichita ACO, and it must clearly state that operation is
approved per Emergency AD 2010-26-53.
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