What happened
The pilot reported that the engine lost power, necessitating a forced landing on desert terrain. The aircraft touched down short of the runway near the Coronado airport. During the incident, the pilot sustained head injuries.
The investigation
Investigators examined the circumstances surrounding the power loss but were unable to determine the specific mechanical or operational reason for the failure. However, environmental conditions were noted as potentially significant factors. At the time of the event, the temperature was 79 degrees Fahrenheit and the dew point was 53 degrees Fahrenheit.
Findings
The weather conditions, specifically the relationship between the temperature and dew point, were conducive to carburetor ice formation. While the exact cause of the power loss remained undetermined, these atmospheric conditions present a known risk for engine performance issues in aircraft equipped with carburetors.