What was found
CRUISE FLIGHT, 1,500 MSL, 31 RPM/NEGATIVE INDICATION OF EMANANT FAILURE ON ENGINE INSTRUMENTS. HEAVY VIBRATION FOR 5-10 SECONDS, FAILURE OF LEFT ENGINE CASE, ENGINE SHUTDOWN, RTB. SUBMITTER SUGGESTED POSSIBLE CASE OF FAILURE AND ROD END BOLT NOT PROPERLY TORQUED. ALL AD'S C/W, NO ANOMALIES NOTED IN PREVIOUS OIL SAMPLE, POSSIBLE ASSEMBLY ERROR. ENGINE DESTROYED DUE TO INTERNAL COMPONENT FAILURE RESULTING IN DESTRUCTION OF ENGINE CASE. (X)