Airworthiness Directives; British Aerospace (Jetstream) Model HS 748 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to all British Aerospace (Jetstream) Model HS 748 series airplanes. This action requires inspections of the inspection holes in all engine `W' frame socket fittings to determine if certain fasteners have been installed, or if the inspection holes have been reworked; and corrective action, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent fatigue cracking at the inspection hole locations, due to the installation of certain fasteners or hole enlargement, which could result in failure of the engine mount structure and consequent separation of the engine from the airplane.