Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Dornier Model 328-300 series airplanes. This proposal would require various one-time inspections for discrepancies of the ground spoiler assemblies and the flap of each wing, and related investigative and corrective actions. This action is necessary to prevent failure of certain ground spoiler support arms due to interference between the ground spoiler assemblies and the wing flaps, which could result in loss of function of affected ground spoiler assemblies and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.