Summary
This document proposes to supersede Airworthiness Directive (AD) 98-13-08, which currently requires replacing and re-routing the power return cables on the starter generator and the generator 2 on certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes. AD 98-13-08 also requires inserting a temporary revision to the pilot operating handbook (POH), and installing a placard near the standby magnetic compass. The proposed AD would retain the actions currently required by AD 98-13-08 on all airplanes affected by that AD, and would require replacing the temporary revision to the POH and the placard near the standby magnetic compass with an improved procedural POH revision and placard. The proposed AD would also require the placard and the temporary revision to the POH for additional serial number Models PC-12 and PC-12/45 airplanes; and would require accomplishing improved Standby Magnetic Compass Swing procedures and incorporating a temporary revision to the maintenance manual on all of the affected airplanes. 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 modifications made to the airplane since manufacture, which could result in flight-path deviation during critical phases of flight.