Mon, Oct 17, 2005
AD NUMBER: 2005-21-02
MANUFACTURER: MDHI
SUBJECT: Airworthiness Directive 2005-21-02
SUMMARY: This amendment supersedes an existing
airworthiness directive (AD) for the MD Helicopters, Inc.(MDHI)
Model 369A, H, HE, HM, HS, D, and E helicopters with a certain part
numbered main rotor blade (blade) and modified with a Helicopter
Technology Company, LLC (HTC),Supplemental Type Certificate (STC)
No. SR09172RC, SR09074RC, or SR09184RC. That AD currently requires
recording on the component history card or equivalent record
(record) each torque event (TE) on each blade, inspecting both
surfaces of the blade, and replacing any cracked blade with an
airworthy blade. Also, that AD establishes life limits for certain
part numbered blades. This amendment revises the model
applicability, adds MDHI part-numbered blades, removes any
reference to the life limits of the blades, changes the
requirements for inspecting the blades, and revises the STC
applicability. This amendment also provides that compliance with
portions of certain documents constitutes alternative methods of
compliance with portions of this AD, contains editorial changes for
clarification, and makes some corrections. This amendment is
prompted by additional reports of cracked blades and by the
comments received inresponse to AD 2003-24-01. The actions
specified in this AD are intended to detect fatigue cracking of the
blade to prevent blade failure and subsequent loss of control of
the helicopter.
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