Airworthiness Directives; Eurocopter France Model SA-365N, SA-365N1, AS-365N2, AS 365 N3, SA-366G1 Helicopters

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This document proposes adopting a new airworthiness directive (AD) for Eurocopter France (ECF) Model SA-365N, SA-365N1, AS-365N2, AS 365 N3, and SA-366G1 helicopters. This proposal would require inspecting the 9-degree frame flange (frame) for the correct edge distance of the four attachment holes for the stretcher support and for a crack and repairing the frame if necessary. This proposal is prompted by a quality control check that revealed some stretcher attachment holes were improperly located on the frame where there was insufficient edge distance. The actions specified by this proposed AD are intended to prevent failure of the frame due to a crack at the stretcher support attachment holes, loss of a passenger door, damage to the rotor system, and subsequent loss of control of the helicopter.