Airworthiness Directives; Dornier Model 328-300 Series Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Dornier Model 328-300 series airplanes. This AD requires installing a drain hole in the lower skin of the left- and right-hand elevator horns. This AD is prompted by reports of water found in the elevator assembly. We are issuing this AD to prevent water or ice accumulating in the elevator assembly, which could result in possible corrosion that reduces the structural integrity of the flight control surface, or in an unbalanced flight control surface. These conditions could result in reduced controllability of the airplane.