What was found
PILOT REPORTED HEARING A 'BOOM' AND A DECREASE IN MANIFOLD PRESSURE DURING FLIGHT. UPON INSPECTION, NR 6 CYLINDER OF RIGHT ENGINE WAS FOUND TO BE AWAY FROM CRANKCASE PAD. FIVE OUT OF EIGHT CYLINDER HOLD-DOWN STUDS HAD BROKEN OFF. TWO THROUGH STUDS, AND ONE SHORT STUD REMAINED TO HOLD CYLINDER ON. SUSPECT CAUSE, NOT TORQUED PROPERLY. 1,454.3 HOBBS.