What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) #33-ON scene investigation revealed a bulging crankcase crack between the push-rod lobes on the #4 cylinder. Post accident investigation revealed there was no movement of the #4 piston when the crank shaft was rotated. Number 4 and 3 cylinders could not be removed in the normal manner due to internal barrel damage. Rotation of the crankshaft revealed movement of the #1, 2 and 3 pistons. Number 3 cylinder was removed and extensive metal particles were found within the crankcase. Probable cause was the failure of the #4 connecting rod.
As the FAA filed it
(-23) #33-ON SCENE INVESTIGATION REVEALED A BULGING CRANKCASE CRACK BETWEEN THE PUSH-ROD LOBES ON THE #4 CYLINDER. POST ACCIDENT INVESTIGATION REVEALED THERE WAS NO MOVEMENT OF THE #4 PISTON WHEN THE CRANK SHAFT WAS ROTATED. NUMBER 4 AND 3 CYLINDERS COULD NOT BE REMOVED IN THE NORMAL MANNER DUE TO INTERNAL BARREL DAMAGE. ROTATION OF THE CRANKSHAFT REVEALED MOVEMENT OF THE #1, 2 AND 3 PISTONS. NUMBER 3 CYLINDER WAS REMOVED AND EXTENSIVE METAL PARTICLES WERE FOUND WITHIN THE CRANKCASE. PROBABLE CAUSE WAS THE FAILURE OF THE #4 CONNECTING ROD.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.