Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Bell Helicopter Textron Canada (BHTC) Model 430 helicopters. This proposal would require replacing arm clamp screws (screws) in the yaw, roll, pitch, and collective syncro resolvers, and installing a guard bracket on the yaw, roll, pitch, and collective syncro resolvers. This proposal is prompted by an operator's report that a yaw control channel jammed during freedom-of-control checks following maintenance. The actions specified by the proposed AD are intended to prevent a jammed flight control and subsequent loss of control of the helicopter.