What happened
The pilot in command (PIC) reported that the aircraft experienced an engine failure while flying in a cruise configuration. Following the incident, the student pilot who was acting as PIC suspected that carburetor icing was responsible for the loss of power.
The investigation
A mechanical inspection of the engine was conducted after the event. Investigators found no evidence of any pre-existing mechanical problems or discrepancies within the engine itself. Additionally, a follow-up inspection checked for fuel contaminants and other potential issues, but none were discovered.
Findings
The investigation utilized icing probability charts to analyze the environmental conditions during the flight. These charts indicated that carburetor icing was likely to occur in the cruise power configuration that the pilot was using at the time of the failure. The absence of mechanical faults and the presence of favorable conditions for icing pointed toward carburetor icing as the primary factor.
Safety message
Pilots operating aircraft with carbureted engines should be aware that carburetor icing can occur even in warm weather or during cruise flight if humidity levels are sufficient. Regular use of carburetor heat, as recommended by the manufacturer and based on current weather conditions, is essential to prevent this hazard.