Incident
Approximately a few minutes after departing North Sioux City-Graham Field in South Dakota, the aircraft was climbing when the crew encountered technical difficulties. In response, they feathered the left propeller. Shortly thereafter, the crew lost control of the airplane. The aircraft subsequently crashed in flames in an open field near Sioux City, South Dakota. The impact and post-crash fire destroyed the aircraft. Both pilots on board were killed.
Probable Cause
According to the official investigation, the probable cause of the accident was an uncontrolled descent following an in-flight fire for undetermined reason.
Findings
Investigators reported two findings: the left propeller was found feathered for unknown reason, and examinations showed no engine malfunction.