AD NUMBER: 2006-13-15
MANUFACTURER: Mitsubishi
SUBJECT: Airworthiness Directive 2006-13-15 SUMMARY: We are adopting a
new airworthiness directive (AD) for all Mitsubishi Heavy
Industries MU-2B series airplanes. This AD requires you to do the
following: Remove and visually inspect the wing attach barrel nuts,
bolts, and retainers for cracks, corrosion, and fractures; replace
any cracked, corroded, or fractured parts; inspect reusable wing
attach barrel nuts and bolts for deformation and irregularities in
the threads; check the minimum breakaway torque of reused wing
attach barrel nuts; replace any deformed or irregular parts; and
install new or reusable parts and torqueto the correct value. This
AD results from a recent safety evaluation that used a data-driven
approach to evaluate the design, operation, and maintenance of the
MU-2B series airplanes in order to determine their safety and
define what steps, if any, are necessary for their safe operation.
Part of that evaluation was the identification of unsafe conditions
that exist or could develop on the affected type design airplanes.
We are issuing this AD to detect and correct cracks, corrosion,
fractures, and incorrect torque values in the wing attach barrel
nuts, which could result in failure of the wing barrel nuts and/or
associated wing attachment hardware. This failure could lead to
in-flight separation of the outer wing from the center wing section
and resultin loss of controlled flight.
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