What was found
WHILE IN FLIGHT IN ICING CONDITIONS THE RIGHT PITOT SYSTEM SEEMED TO FREEZE UP, THUS DISCONNECTING THE AUTOPILOT AND FLIGHT DIRECTOR. THE PITOT HEAT FUNCTIONS BUT WE SUSPECT MOISTURE GATHERS FURTHER DOWN THE PITOT LINE AND FREEZES. MAINTENANCE AT PREMIER JET CENTER AT KFCM HAS BEEN NOTIFIED IN THE PAST BUT UNABLE TO SOLVE THE PROBLEM. THIS HAS HAPPENED IN OTHER PC-12NG’S TO ME AS WELL. IT HAPPENS ON OCCASION WHEN IN ICING CONDITIONS.