Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain de Havilland Model DHC-8- 102, -103, and -301 series airplanes. This proposal would require a one-time inspection for wear and breakage of wire segments of the individual lighting units of the ceiling and sidewall lights, and replacement of any damaged wiring. This proposal also would require installation of teflon spiral wrap on the wiring of the ceiling and sidewall lights. This proposal is prompted by reports of chafing found on the electrical wiring of the cabin ceiling lighting system. The actions specified by the proposed AD are intended to prevent the possibility of a fire on an airplane due to such chafing and consequent short circuiting, overheating, and smoking of the wires on the aircraft structure.