At what temperature range is carburetor icing likely to occur?

Carburetor icing is most likely to occur within the temperature range of 20 to 70 degrees Fahrenheit. This phenomenon occurs due to the principle of fuel vaporization and the cooling effect it has on surrounding air as fuel is mixed with air in the carburetor. When the temperature falls below 70 degrees, the conditions are conducive to ice formation, especially in high humidity environments.

In this temperature range, the combination of ambient temperatures and relative humidity levels can lead to the formation of ice, which can restrict airflow through the carburetor and can cause engine performance issues. At temperatures above 70 degrees Fahrenheit, the likelihood of carburetor icing diminishes significantly as the warmer air helps to prevent ice formation. Similarly, at temperatures below 20 degrees Fahrenheit, while icing can still potentially occur, conditions are generally less favorable compared to the 20 to 70 degrees range due to the reduced humidity levels.

Understanding where carburetor icing can occur helps pilots and operators be vigilant about potential performance impacts during flight, especially when flying in conditions that are conducive to icing.