AD FAA-2008-0041

We are adopting a new airworthiness directive (AD) for Eurocopter France Model AS 355 N helicopters. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The European Aviation Safety Agency (EASA), the technical agent for France, with which we have a bilateral agreement, states in the MCAI: "This Airworthiness Directive (AD) is issued because it was found that the power drawn by the starter generators from the engines is above the consumption capacity at altitudes above 3,000 meters, declared for the engines of AS 355 N helicopters. Excessive power consumption of the starter generators reduces the engine surge margin, which can result in engine failure." After engine start, the starter generator functions as the normal operational electrical generator. We are issuing this AD to require actions that are intended to address this unsafe condition.