Summary
This document proposes superseding an existing airworthiness directive (AD) for the specified Bell Helicopter Textron Canada (BHTC) model helicopters. That AD currently requires an initial inspection and at specified intervals checks and inspections of the tail rotor blade (blade) for a deformation, a crack, and a bent or deformed tail rotor weight (weight). Also, that AD requires, before further flight, replacing each blade with an airworthy blade if a deformation, a crack, or a bent or deformed weight is found. This action would contain the same actions as the existing AD and would also propose adding certain serial-numbered blades to the applicability that were inadvertently omitted from the current AD and would require replacing each affected blade, which would be terminating action. This proposal is prompted by three reports of skin cracks originating near the blade trailing edge balance weight. The actions specified by the proposed AD are intended to prevent blade failure and subsequent loss of control of the helicopter.