Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to certain Dassault Model Fan Jet Falcon series airplanes and Model Mystere-Falcon 20 series airplanes. That action would have required inspecting and testing for fatigue cracking due to stress corrosion in the vertical posts of the window frames in the flight compartment. This new action revises the proposed rule by adding airplanes to the applicability, clarifying which airplanes must do certain actions, and specifying which window frames to ultrasonically inspect. The actions specified by this new proposed AD are intended to prevent fatigue cracking of the window frames, which could result in rapid depressurization of the fuselage and consequent reduced structural integrity of the airplane. This action is intended to address the identified unsafe condition.