Accident Overview
On September 2, 2024, at 0914 central daylight time, an experimental, amateur-built CH601 XL aircraft, registration N624RJ, sustained substantial damage following an emergency landing in a field near Odessa, Missouri. The pilot and a pilot-rated passenger received minor injuries. The flight was conducted under Title 14 Code of Federal Regulations Part 91 as a personal flight.
Pilot Account
The pilot, who also owned the airplane, reported that approximately five minutes after departure, the engine coolant temperature began to rise rapidly. In response, he turned the airplane toward the departure airport and reduced engine power and airspeed. He continued to decrease power in an attempt to stabilize or lower the coolant temperature. When the temperature continued to climb, he decided to attempt a landing at a closer airport. However, steam and an odor filled the cockpit, prompting him to choose a field landing. During the landing roll, the airplane struck a shallow drainage ditch, resulting in substantial damage to the fuselage and left wing.
Postaccident Examination
A Federal Aviation Administration inspector examined the airplane after the accident. The aircraft was equipped with an automotive engine. The inspection revealed no coolant leaks, and the coolant overflow tank was full. Despite these findings, the cause of the overheating could not be determined. The pilot stated that he had not experienced coolant overheating on previous flights and was unable to explain the event.
Conclusion
No probable cause was identified by the investigation. The source notes that the reason for the engine overheat remains unknown.