Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Dornier Model 328-100 series airplanes. This proposal would require replacement of the de- icing system timer with a new improved timer. This proposal is prompted by reports of a short circuit in the propeller and/or de-ice wiring, and subsequent failure of the timer. The actions specified by the proposed AD are intended to prevent propeller disbonding due to short circuiting in the de-icing wiring system, which could result in reduced controllability of the airplane.