Summary
This document proposes adopting a new airworthiness directive (AD) for the specified Eurocopter France (ECF) model helicopters. This proposal would require replacing the hydraulic fluid at a specified time interval when operating in cold weather. This proposal 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 proposed 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.