Airworthiness Directives; Short Brothers Model SD3-60 Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to all Short Brothers Model SD3-60 airplanes, that requires performing repetitive inspections of the shear attachment fittings of the vertical stabilizer for corrosion, and performing corrective actions if necessary. The actions specified by this AD are intended to detect and correct corrosion in the area of the main spar web fittings of the vertical stabilizer, which could result in reduced structural integrity of the vertical stabilizer. This action is intended to address the identified unsafe condition.