What was found
DURING 100-HOUR INSPECTION, THE CRANKCASE WAS FOUND CRACKED (2 INCHES). THIS WAS THE SAME CRACK THAT WAS FOUND 2 YEARS AGO WHEN THE ENGINE HAD 1,500 HOURS TSMO. THE CASE HALVES WERE REPLACED AND NOW 1,000 HOURS LATER, THE SIMILAR CRACK HAS RE-APPEARED. SUSPECT VIBRATION PROBLEM.