Airworthiness Directives; Bell Helicopter Textron Model 206A and 206B Helicopters

This amendment adopts a new airworthiness directive (AD) for Bell Helicopter Textron (Bell) Model 206A and 206B helicopters modified by Aeronautical Accessories, Inc. Supplemental Type Certificate (STC) SH1392SO with certain part-numbered high crosstubes. This amendment requires inspecting at specified time intervals and replacing any cracked crosstubes. This amendment is prompted by the discovery of a cracked high forward crosstube. The actions specified by this AD are intended to detect a crack in the crosstube which could lead to failure of the crosstube, collapse of the landing gear, and subsequent loss of control of the helicopter.