Is it safe to fly an airplane that has frost on its wings?

Flying an airplane with frost on its wings is not safe because frost disrupts the smooth airflow over the wing surfaces. The presence of frost alters the aerodynamic properties of the wings, which can lead to a decrease in lift and an increase in drag. This degradation in performance can result in difficulty in controlling the aircraft, particularly during takeoff and landing.

Regulations and safety guidelines emphasize the importance of ensuring that the aircraft is free of any ice, snow, or frost before flying. This is crucial for maintaining the aircraft's performance capabilities and ensuring the safety of both the crew and passengers. Therefore, it is mandated that flying with frost on the wings is not permitted.