AD NUMBER: 2006-08-12
MANUFACTURER: MDHI
SUBJECT: Airworthiness Directive 2006-08-12 SUMMARY: This amendment
supersedes an existing airworthiness directive (AD) for the MD
Helicopters, Inc. (MDHI) Model 600N helicopters, that currently
requires inspecting both upper tailboom attachment fittings, nut
plates and both angles for a crack or thread damage, and repairing
or replacing any cracked or damaged part. That AD also requires
replacing the upper right tailboom attachment bolt with a new
attachment bolt, and if the upper right attachment bolt is broken,
replacing the three remaining attachment bolts with airworthy
bolts. Adding a washer to each bland modifying both access covers
is also required. Thereafter, inspecting the upper tailboom
attachments and repairing or replacing any cracked part is required
by that AD. That AD was prompted by the discovery of a cracked
attachment bolt on a helicopter. This AD requires those same
actions, plus installing additional inspection holes in the aft
fuselage skin panels and inspecting the upper and lower tailboom
attachment fittings, the upper longerons, and the angles and nut
plates for cracks. It also requires, within a specified time,
replacing the upper right tailboom attachment fitting, painting the
inspection area, and replacing existing nut plates. Additionally,
it requires inspecting the attachment bolts for any damage or wear.
This amendment is prompted by an accident involving a Model 600N
helicopter. The actions specified by this AD are intended to
prevent failure of the tailboom attachment fittings, separation of
the tailboom from the helicopter, and subsequent loss of control of
the helicopter.
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