TUCSON, AZ, USA
N69116
CESSNA 152
THE PILOT OF A CESSNA 152 EXPERIENCED ENGINE FAILURE DURING PILOT TRAINING MANEUVERS. THE STUDENT PILOT STATED THE ENGINE JUST 'FROZE.' EXAMINATION REVEALED THAT A CRANKSHAFT BEARING ROTATED AFFECTING THE OIL SUPPLY TO NUMBER 3 AND 4 CONNECTING RODS. NUMBER 3 CONNECTING ROD FAILED. EXAMINATION OF THE ENGINE LOG BOOK REVEALED THAT THE ENGINE HAD ACCRUED 2477.4 HOURS SINCE MAJOR OVERHAUL. THE FACTORY RECOMMENDED TIME BETWEEN OVERHAUL WAS 2400 HOURS.
ENGINE FAILURE DUE TO OIL STARVATION CAUSED BY A ROTATION OF THE MAIN BEARING. A FACTOR IN THE ACCIDENT WAS THE FAILURE OF THE OPERATOR MAINTENANCE PERSONNEL TO ACCOMPLISH AN ENGINE OVERHAUL WITHIN THE INTERVAL SPECIFIED BY THE MANUFACTURER.
Source: NTSB Aviation Accident Database
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