SELBYVILLE, DE, USA
N67803
CESSNA 152
THE ACFT HAD JUST CLIMBED OUT AFTER A BANNER PICKUP WHEN THE ENG BEGAN TO RUN ROUGH. THE PLT ADJUSTED THE MIXTURE & THE ENG TEMPORARILY SMOOTHED OUT. ABOUT 2 MINUTES LATER, THE ENG RAN ROUGH AGAIN & THE PLT RELEASED THE BANNER. THE ENG BEGAN A SEVERE VIBRATION, BACKFIRED, & QUIT RUNNING. SUBSEQUENTLY, THE ACFT NOSED OVER DRG AN EMERGENCY LANDING IN A SOYBEAN FIELD. AN ENG TEARDOWN REVEALED THE #4 EXHAUST LOBE OF THE CAMSHAFT WAS WORN & THAT THE $4 EXHAUST TAPPET WAS IN POOR CONDITION. ALSO, THERE WAS EVIDENCE THAT THE #4 CONNECTING ROD HAD BEEN SUBJECTED TO HIGH TEMP.
EXCESSIVE WEAR OF THE NUMBER FOUR EXHAUST LOBE ON THE CAMSHAFT AND POOR CONDITION (WEAR) OF THE NUMBER FOUR EXHAUST TAPPET. THE SOYBEAN CROP IN THE EMERGENCY LANDING AREA WAS CONSIDERED TO BE A FACTOR.
Source: NTSB Aviation Accident Database
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