NTSB Identification: CHI97LA037.
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Accident occurred Wednesday, November 27, 1996 in BOWBELLS, ND
Probable Cause Approval Date: 05/23/1997
Aircraft: CESSNA 150, registration: CGOCS
Injuries: 2 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
While in cruise flight, the pilot said his RPM suddenly dropped and the engine began to make a '...stuttering...' noise. He said he applied carburetor heat and positioned the mixture to full rich. The engine continued to make the stuttering noise and have '...drops in the RPM.' As he approached an alternate airport he said he was informed the airport had no winter maintenance. He said he selectd a field that appeared flat with a little snow on it for a landing. As he approached the field he said it was a hill and landed next to it. An on-scene investigation revealed no mechanical or fuel anomalies that would cause the engine to stop running. The nose gear crushed the bottom of the firewall when it was bent aft during the landing. Ice crystals were found in the carburetor venturi and float bowl.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: the pilot's failure to lean the mixture control after applying carburetor heat as the pilot's operating handbook states should be done. The carburetor icing conditions and the terrain were factors. Full narrative available
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