CESSNA 175 near Sugar Creek, OH — 2011-08-31

Probable cause

The pilot's delayed application of carburetor heat while operating in conditions conducive to carburetor icing.

NTSB narrative

The pilot reported that the airplane's engine began to run rough during level flight, with about a 70 percent power setting. He switched fuel tanks and applied carburetor heat, but the airplane's engine continued to run rough. The pilot initiated a forced landing to a cornfield during night light conditions. Postaccident examinations of the airplane revealed that the firewall was buckled. No anomalies were found with regard to the airplane, engine, or systems during the postaccident examinations. According to the Federal Aviation Administration icing probability chart, the airplane was operating in conditions conducive to carburetor icing at the time of the accident.

NTSB coding

• Loss of engine power (partial) · Enroute-cruise
• Engine Failure Enroute
• Carburetor Icing Conditions
• Delayed Action

Evidence available

• 4 docket documents

Docket documents4

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• E-mail from FSDO inspectorother
• FAA SAIB on carburetor icingother
• Record of conversation with FSDO inspectorother

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