Airworthiness Directives; Saab Model SAAB 2000 Series Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Saab Model SAAB 2000 series airplanes. This action requires a one-time visual inspection of the right-and left-hand propeller gearbox to ensure that the attachment nut that secures the borescope plug to the gearbox is installed; and installation of an attachment nut, 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 oil leakage from the propeller gearbox, which could lead to an increase in oil temperature and result in engine shutdown.