AD FAA-2012-1067

We are adopting a new airworthiness directive (AD) for certain DASSAULT AVIATION Model FALCON 2000, FALCON 2000EX, MYSTERE-FALCON 900, and FALCON 900EX airplanes; and all Model MYSTERE-FALCON 50 airplanes. This AD was prompted by reports that collapse of the main landing gear (MLG) could cause wing tank structure failure, which could result in fuel spillage and consequent fire hazard. This AD requires modification of the wing fuel tanks in the area of the wheel well. We are issuing this AD to prevent fuel spillage in the event of a MLG collapse, and consequent fire hazard.