AD FAA-2014-0657

We are adopting a new airworthiness directive (AD) for certain Dassault Aviation Model FALCON 2000, FALCON 2000EX, MYSTERE-FALCON 900, and FALCON 900EX airplanes. This AD was prompted by reports of a co- pilot sliding aft on his seat during take-off at rotation. This AD requires replacement of certain springs installed on the pilot and co- pilot seats. We are issuing this AD to prevent fatigue wear, which, if not corrected, could cause the seat to slide and the pilot or co-pilot to lose contact with the controls, leading to an inadvertent input on the flight control commands during take-off or climb, possibly resulting in loss of control of the airplane.