What was found
DURING THE COURSE OF A NORMAL FLIGHT, PILOT NOTICED OIL LEAK ON LEFT ENGINE. AFTER FLIGHT, REMOVED ENGINE COWLING AND SAW 5 CYLINDER STUDS HAD BROKEN ON THE NR 1 CYLINDER. ON ENGINES OPERATED ON 1600 TBO'S, SUSPECT TIME IN SERVICE IS THE MAIN CAUSE FOR BREAKAGE. PLEASE NOTE: THIS IS NOT A 7TH STUD TYPE CASE, HOWEVER, IT IS A 'HEAVY' CASE.