Airworthiness Directives; Eurocopter France Model AS350B, BA, B1, B2, B3, D, and AS355E Helicopters

This amendment adopts a new airworthiness directive (AD) for the specified Eurocopter France (ECF) model helicopters that requires replacing the hydraulic fluid at a specified time interval when operating in cold weather. This amendment is prompted by reports of ice forming due to condensation in some parts of the hydraulic system during cold weather operation. The actions specified by this AD are intended to prevent ice from forming in the hydraulic system resulting in an unintended movement of the flight controls and subsequent loss of control of the helicopter.