Which action is recommended to prevent carburettor icing during flight operations?

To prevent carburettor icing during flight operations, it is highly recommended to regularly apply carburettor heat as needed. Carburettor icing occurs when moisture in the air condenses and freezes within the carburettor, which can disrupt the airflow and lead to engine performance issues. Applying carburettor heat increases the temperature of the air-fuel mixture entering the engine, thus reducing the likelihood of ice formation.

This proactive measure is particularly important in conditions where temperatures are low, and humidity levels are high, as these are the primary conditions conducive to carburettor icing. Regular application of carburettor heat allows the pilot to mitigate the risk of icing by ensuring that the fuel and air mixture maintains the appropriate temperature, thereby promoting smooth engine operation.

The other suggested actions don't effectively address the problem as directly as applying carburettor heat does. Monitoring outside air temperature can provide useful information about potential icing conditions, but it doesn't actively prevent icing. Keeping the throttle fully open could potentially result in different engine performance issues and might not have a significant impact on carburettor icing. Using fuel with a higher boiling point may be beneficial in some contexts, but it does not resolve the immediate risk of ice forming inside