Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to certain Dassault Model Mystere-Falcon 50 series airplanes, that would have required repetitive tests of double-skin feeder tanks for fuel leaks, and corrective actions, if necessary. It also would have required modification of seals in the feeder tanks, which would have terminated the repetitive leak tests. That proposal was prompted by issuance of mandatory continuing airworthiness information by a foreign airworthiness authority. This new action revises the proposed rule by making the proposed requirements applicable to additional airplanes. The actions specified by this new proposed AD are intended to prevent fuel leaks from the feeder tanks, which could result in fuel vapors in the cabin that could come into contact with ignition sources. The actions are intended to address the identified unsafe condition.