Airworthiness Directives; Bell Helicopter Textron Canada Inc. Helicopters

We are adopting a new airworthiness directive (AD) for certain Bell Helicopter Textron Canada Inc. (BHT) Model 206A, 206B, and 206L helicopters. This AD requires replacing certain part-numbered engine auto-relight kit control boxes. This AD was prompted by a design review that revealed the control box chipset did not meet the required temperature range requirements, which could cause the control box to malfunction, disabling the engine auto-relight system. The actions of this AD are intended to prevent a disabled auto-relight system, failure of the engine to relight after a flame-out, increased pilot workload during a power loss emergency, and subsequent loss of control of the helicopter.