Summary
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to Bell Helicopter Textron, Inc. (BHTI) Model 204B, 205A, and 205A-1 helicopters, that currently requires modification and inspections of the vertical fin spar for cracks. This action would require modification and visual and dye- penetrant inspections of the vertical fin spar for cracks, and if a crack is discovered, replacing the vertical fin spar. This action would also require a tapping test for disbonding and replacing certain fin spars within 12 calendar months. This proposal is prompted by an accident involving a Model 205A-1 helicopter and 4 other accidents involving helicopters of similar type design. The actions specified by the proposed AD are intended to prevent failure of the vertical fin spar, loss of the tail rotor, and subsequent loss of control of the helicopter.