EUROCOPTER FRANCE Model SA-365N, SA-365N1, SA-366G1, AS-365N2, AS 365 N3, EC 155B, and EC155B1 helicopters [Docket No. FAA-2012-0354; Directorate Identifier 2010-SW-104-AD; Amendment 39-17165; AD 2012-17-02] – requires replacing the main rotor mast nut with an airworthy main rotor mast nut to prevent this scenario. This AD was prompted by the discovery of a cracked main rotor mast nut. This condition, if not corrected, could lead to complete failure of the mast nut, resulting in failure of ...

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