AD FAA-2016-8843

We are adopting a new airworthiness directive (AD) for certain Dassault Aviation Model FALCON 900EX and FALCON 2000EX airplanes. This AD requires revising the airplane flight manual (AFM) to include procedures to follow when an airplane is operating in icing conditions. This AD also provides optional terminating action for the AFM revision. This AD was prompted by a design review of in-production airplanes that identified a deficiency in certain wing anti-ice system ducting. A deficiency in the wing anti-ice system ducting could lead to undetected, reduced performance of the wing anti-ice system, with potential ice accretion and ingestion, possibly resulting in degraded engine power and degraded handling characteristics of the airplane. We are issuing this AD to ensure the flight crew has procedures for operating an airplane in icing conditions.