What happened
The aircraft experienced an in-flight loss of engine power while operating within the traffic pattern for landing. The pilot initiated an off-airport forced landing, resulting in the aircraft coming to rest in a plowed field.
Upon arrival at the scene, the airport manager observed that the carburetor heat control was in the off position. When questioned regarding the use of carburetor heat prior to the incident, the pilot stated she believed she had applied it but could not confirm this with certainty.
The investigation
A post-accident examination was conducted two days after the event. The engine was started and operated during this inspection. The engine ran without any apparent mechanical issues or irregularities during the test run.
Findings
The operational data indicates that carburetor icing likely contributed to the power loss. Although the pilot attempted to use carburetor heat, the control was found in the off position at the time of inspection, and her recollection was uncertain. The engine's subsequent normal operation suggests no pre-existing mechanical failure.