Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Raytheon (Beech) Model 400A and 400T series airplanes. This proposal would require replacement of temperature switch assemblies of the wing ice protection system with new, improved parts. This proposal is prompted by reports of electrical continuity problems with solder joints on the temperature switches of the wing ice protection system. The actions specified by the proposed AD are intended to prevent detachment or breakage of wires in the temperature switch assemblies of the wing ice protection system. Such detachment or breakage of wires could result in the flightcrew not being advised of an over-temperature situation on the leading edge of the wing, which could result in structural damage to the wing.