Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214ST Helicopters

This amendment adopts a new airworthiness directive (AD), applicable to Bell Helicopter Textron, Inc. (BHTI) Model 214ST helicopters, that requires replacement of each emergency float inflation solenoid valve (valve). This amendment is prompted by two inadvertent inflations of emergency float systems that resulted from self- activations of the valves. The actions specified by this AD are intended to prevent self-activation of the valves, and subsequent inadvertent inflation of the emergency float system, which could lead to loss of control of the helicopter.