Airworthiness Directives; Dassault Model Falcon 900EX Series Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to all Dassault Model Falcon 900EX series airplanes. This action requires revising the airplane flight manual to advise the flightcrew about limitations on operating in icing conditions, and to require that the airplane be operated per these limitations. This action is necessary to ensure that the flightcrew is aware of the potential for reductions in climb performance in certain situations while operating in icing conditions, and the actions they must take to avoid this condition, which could result in an inability to avoid low- level obstacles during takeoff and consequent controlled flight into terrain. This action is intended to address the identified unsafe condition.