Under what conditions is carburetor ice likely to form?

Carburetor ice is particularly likely to form under conditions of outside air temperatures ranging from -7° to 21° C with high relative humidity. The formation of carburetor ice occurs due to the cooling effect of fuel vaporization, which can create a drop in temperature that causes moisture in the air to freeze. When temperatures are within this specific range, the air can hold a significant amount of moisture, and when combined with the cooling effect from the carburetor, it leads to conditions that favor ice formation.

At this temperature range, the combination of moisture in the air and the cooling effect can lead to serious performance issues in an aircraft's engine due to ice accumulation. Therefore, understanding these conditions is crucial for pilots and aviation maintenance personnel to prevent the potential hazards associated with carburetor icing.