Airworthiness Directives; Dassault Model Falcon 10 Series Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to all Dassault Model Falcon 10 series airplanes. This action requires an inspection to verify proper installation of the pins in the dual non-return valves of the fire extinguishing system for the engines, and replacement of any defective valve with a new valve. This action is necessary to prevent failure of a fire extinguisher bottle to discharge, which could result in the inability to extinguish a fire in an engine. This action is intended to address the identified unsafe condition.