What was found
AC WAS ON FERRY FLIGHT, PILOT REPORTED GETTING OIL ON WINDSHIELD. OIL BEGAN TO GET WORSE; REDUCED POWER, AC STARTED VIBRATING SEVERELY. POWER WAS REDUCED FURTHER AND VIBRATION ALSO REDUCED. PILOT LANDED AC IN UNPLANTED FIELD. AC SKIPPED OVER TERRACE AS SLOWED TO STOP. TAIL CAME UP AND AC WENT OVER ON NOSE. PROP STRUCK GROUND AND SEPARATED FROM ENGINE. CRANKSHAFT HAD BROKEN IN PROP THRUST BEARING AREA. EXAM OF CRANKSHAFT SHOWS FATIGUE CRACKING. BLADES DAMAGED APPROX 25 INCHES FROM TIPS. PROP WAS INSTALLED AFTER BEING O/H. ENGINE RUN AND GROUND CHECKS COMPLETED. PROP WAS IN SERVICE .5 HOUR BEFORE FAILURE OF CRANKSHAFT. (CE07200414081)