AD NUMBER: PL2005-05-52 MANUFACTURER: Cessna SUBJECT: Airworthiness Directive
PL2005-05-52 SUMMARY: Emergency AD 2005-05-51 was considered an
interim action to immediately require visual inspection of the
forward, aft, and auxiliary wing spars for cracks. The intent was
to detect immediate and existing cracking before it grew to wing
failure. The FAA has also received a report of a third crack found
at WS 112 on a Model 402C airplane. Cessna has developed new
inspection techniques (eddy current) for the forward spar that are
more effective at detecting cracks before the structural integrity
of the wing is compromised. These inspection techniques will allow
for longer intervals between repetitive inspections than in
emergency AD 2005-05-51. Recent fatigue analysis that Cessna did
and the FAA reviewed reveals that eddy current inspections of the
forward wing spars combined with visual inspections of the aft and
auxiliary spars will address the unsafe condition of these
airplanes until long-term continued operational safety is assured
through the Cessna-developed and FAA-approved spar strap
modifications.
Specifically, the eddy current inspection will replace the
visual inspection of the forward spar that emergency AD 2005-05-51
currently requires; and the visual inspections of the aft and
auxiliary spars will be maintained from emergency AD 2005-05-51,
but will only be required repetitively every 100 hours TIS instead
of every 15 hours TIS. Cessna has issued the following service
information to include procedures to eddy current inspect the
Models 402C and 414A airplanes: Cessna Service Bulletin MEB99-3,
Revision 2, dated February 28, 2005 (Model 402C); or Cessna Service
Bulletin MEB00-7, Revision 2, dated February 28, 2005 (Model
414A).
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