What should be done with frost prior to takeoff?

Prior to takeoff, it is essential to remove all frost from the aircraft's surfaces. Frost can significantly affect the aerodynamic properties of the wings and control surfaces, leading to reduced lift and increased drag. This can compromise the aircraft's performance during takeoff and impose risks to safety.

Removing all frost ensures that the aircraft surfaces are smooth and clean, allowing for optimal airflow over the wings. This is crucial in maintaining the necessary lift for a safe takeoff. Additionally, any frost that remains can create an uneven surface, further deteriorating performance metrics and increasing the likelihood of stalling.

While applying de-icing fluid can be a part of the frost-removal process, it is imperative to first ensure that all frost is completely removed to maintain safe operation. Therefore, removing all frost is the most appropriate course of action before flight.