Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Pilatus Aircraft Ltd. (Pilatus) Model PC-12 airplanes. The proposed action would require replacing and re- routing the power return cables on the starter generator and generator 2, inserting a temporary revision to the pilot operating handbook (POH), and installing a placard near the standby magnetic compass. 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 directional deviation on the standby magnetic compass caused by an overload of electrical current in the airplane structure, which, if not corrected, could result in flight-path deviation during critical phases of flight in icing conditions and instrument meteorologic conditions (IMC).