When is carburetor ice most likely to occur during flight?

Carburetor ice forms when there is a significant temperature drop within the carburetor due to the venturi effect, which occurs when fuel and air are mixed. This is particularly likely in cold and humid conditions because the moisture in the air can contribute to ice formation, and the colder temperatures enable the conditions under which ice can develop.

In cold, humid weather, the air is dense and holds moisture, both of which enhance the likelihood of icing. The combination of these factors means that even if the outside air temperature is not freezing, the conditions within the carburetor can reach the dew point, causing condensation that can freeze and create ice.

Understanding when carburetor ice is most likely to occur allows pilots to be vigilant and take necessary precautions, such as checking for carburetor heat application, especially when operating under expected icy conditions.