Incident
Shortly after takeoff, the pilot detected an unusual odor. While entering the downwind leg for a precautionary landing, smoke filled the cabin. Witnesses on the ground observed the aircraft trailing smoke as it approached the runway. The airplane touched down with excessive force, causing the landing gear to collapse. Flames became visible inside the cabin as the aircraft slid to a stop.
Investigation Findings
Post-accident examination of the airframe revealed that an in-flight fire had originated in the baggage compartment. Inside the compartment, investigators found an automotive-style battery with a set of jumper cables attached to its terminals. The opposite ends of the cables were fused together on the baggage compartment floor. The pilot stated that he kept the battery in the baggage compartment for the purpose of jump-starting the airplane, but he did not recall using it on the day of the accident.
Witness Account
One witness reported hearing multiple unsuccessful attempts to start the airplane, noting that the battery seemed weak. The witness then observed the baggage door being opened, and shortly thereafter, the airplane was started.