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N42080 accident description

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Crash location 45.481945°N, 92.988333°W
Nearest city North Branch, MN
45.509685°N, 93.086610°W
5.1 miles away
Tail number N42080
Accident date 10 Aug 2008
Aircraft type Piper J-3
Additional details: None

NTSB Factual Report

The pilot reported that the engine started running rough and vibrating. He turned the ignition key to "OFF" and executed a forced landing to a field. The fuselage sustained substantial damage during the forced landing to a rough field. The inspection of the engine revealed that the number one cylinder connecting rod had failed. It exhibited signatures consistent with overheating. The number one cylinder connecting rod bearing was extruded and pieces were found in the oil screen. The bearing exhibited signatures consistent with overheating. About 2 quarts of oil were found in the engine sump with no signs of external oil leakage. The pilot reported that oil level during the preflight was over 4 quarts.

NTSB Probable Cause

The loss of engine power as a result of oil starvation to the number one rod bearing and number one connecting rod. Contributing to the accident was the rough terrain.

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