Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Raytheon Aircraft Company (Raytheon) Beech Model F33A, A36, B36TC, 58/58A, C90A, B200, and 1900D airplanes equipped with a KA-33 cooling blower. The proposed AD would require you to incorporate certain electrical parts to protect cooling blowers. Several reports of circuit breakers failing to protect cooling blowers on the affected airplanes have prompted the proposed action. The actions specified by the proposed AD are intended to provide protection to the blower motor circuit, thus reducing the possibility of emission of smoke or a burning odor into the cockpit or passenger compartment as a result of a failed or seized blower motor.