Airworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 050 series airplanes. This action requires modification of the window frames surrounding the windshield windows and installation of reinforcement plates on all window frames of the flight compartment. For certain airplanes, this action requires modification of the window frames surrounding the sliding windows and direct vision windows of the flight compartment. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent structural degradation of the window frames of the flight compartment, which could result in depressurization of the airplane during flight.