Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes that are equipped with a certain windshield configuration. The proposed AD would require you to incorporate pilot's operating handbook (POH) information that would prohibit the operation of the windshield heating system in the "LIGHT" mode, and would require you to modify the windshield deicing system wiring and circuit breakers. You could remove the POH information after accomplishing the modification. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by the proposed AD are intended to prevent loss of electrical power to the windshield deicing system due to operation in the "LIGHT" mode, which could result in icing of the windshield and loss of control of the airplane.