What happened
After landing on runway 31L, the pilot of an Aeronca exited at the first taxiway and received clearance from ground control to proceed to his destination on the airport. As the aircraft approached and passed behind a Beech C-9MA performing a runup at a hold short position, the Aeronca spun around and experienced an engine failure.
The pilot of the Aeronca notified ground control that the aircraft had spun around. In response, ground control instructed the Beech C-99 to reduce power to idle, which the crew acknowledged.
The pilot of the Aeronca then exited his aircraft to perform a hand prop of the engine. After the engine successfully started, the Aeronca began taxiing without any occupants because the pilot had left the throttle in a position greater than idle. During this unmanned taxi, the Aeronca subsequently impacted the right rear quarter of the Beech C-99. No injuries were reported.