Summary
This document proposes adopting a new airworthiness directive (AD) for Bell Helicopter Textron Canada (BHTC) Model 430 helicopters. This proposal would require replacing a certain servo actuator-to- actuator support attachment bolt (bolt) with an airworthy bolt. This proposal would also require establishing a retirement life for certain bolts and recording the retirement life on a component history card or equivalent record. This proposal is prompted by further evaluation of certain fatigue-critical parts, resulting in establishing a life limit of 5000 hours for the affected bolts. The actions specified by this proposed AD are intended to prevent fatigue failure of the bolt and subsequent loss of control of the helicopter.