What was found
LEFT ENGINE OIL LEAK ON TAKEOFF WITH WHITE SMOKE, CREW FEATHERED AND LANDED. DURING INSPECTION, A HOLE WAS FOUND IN THE CRANKCASE, AND ANOTHER LOCATION SHOWED A FRACTURED CASE. THE ENGINE WAS DISASSEMBLED, AND A CRANKSHAFT BOLT E4A-10-100-202 WAS FOUND TO HAVE FAILED. THE HEAD OF THE BOLT HAD MIGRATED THROUGH THE LOWER POWER SECTION, CAUSING DAMAGE TO THE ENGINE CASE AND INTERNAL ENGINE ITEMS. THE ENGINE WAS REPLACED.