Airworthiness Directives; Raytheon (Beech) Model 400A and 400T Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Raytheon (Beech) Model 400A and 400T series airplanes, that requires replacement of temperature switch assemblies of the wing ice protection system with new, improved parts. This amendment 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 this 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.