Accident Overview
An instructional flight intended to add a multi-engine instrument rating to a dual student's certified flight instructor certificate ended when the airplane spun into the ground. The flight departed at 1315, and the instrument flight plan was subsequently cancelled, with the flight continuing under visual flight rules.
Flight Maneuvers and Descent
Radar data showed the airplane conducting maneuvers at altitudes between 4,200 and 4,700 feet above ground level. At approximately 1340, an eyewitness reported hearing the airplane flying overhead, then the engine sound stopped. The witness looked up and observed the airplane spinning towards the ground. The witness did not recall hearing the engines running during the final descent.
Pre- and Post-Crash Findings
The pilot reported no flight control or mechanical anomalies prior to the accident. A post-crash examination of the airplane revealed no anomalies with the airframe or systems.
Conclusion
The accident sequence involved a loss of engine sound followed by a spin, but the investigation found no mechanical or control issues that could explain the event.