Incident Overview
An instructor and a certificated pilot were conducting training maneuvers. Approximately 25 minutes into the flight, the pilots detected an unusual odor described as 'something funny.' Shortly thereafter, smoke emerged from beneath the front floorboards of the airplane. Within a short period, flames became visible in the same area.
Emergency Response
The instructor, who was at the controls, immediately initiated an emergency descent and executed a successful off-airport landing. Both pilots evacuated the airplane without delay. The aircraft was subsequently consumed by fire and sustained total destruction.
Investigation Findings
Post-incident examination revealed that the fire was confined to areas aft of the firewall. Despite thorough inspection, the ignition source could not be identified. The airplane was not equipped with an electrical system, which eliminated potential electrical faults. The engine and exhaust system were found to be intact, with no anomalies noted. No mechanical deficiencies or pre-existing conditions were identified that could explain the origin of the fire.
Conclusion
The investigation concluded that the fire originated in the vicinity of the front floorboards and spread rapidly, resulting in the destruction of the aircraft. The exact cause of the ignition remains undetermined.