What was found
(CAN) ON FEB 28/10, DURING CRUISE FLIGHT ENGINE DEVELOPED A VIBRATION FOLLOWED WITHIN SECONDS BY A TOTAL SEIZURE. AIRCRAFT WAS LANDED WITHOUT INJURY TO PILOT OR PASSENGER BUT TOTAL LOSS OF AIRFRAME. DISASSEMBLY OF ENGINE REVEALED THE CRANKSHAFT HAD FRACTURED THROUGH THE NR 3 CONNECTING ROD JOURNAL. CAUSE OF FAILURE NOT DETERMINED. POSSIBLE CONTRIBUTING FACTORS, NON STANDARD PROPELLER AND PROPELLER SPACER ALLOWING UNCONTROLLED TORSIONAL VIBRATIONS.