Flight operations with frost on the upper wing surface is permitted?

Flight operations with frost on the upper wing surface are generally not permitted, as frost can disrupt the smooth airflow over the wing and significantly impair lift and control. Even a small amount of frost can lead to increased stall speeds and reduced aircraft performance. It is crucial for pilots and ground crews to ensure that all critical surfaces are free of ice or frost before takeoff to maintain safety. Regular de-icing procedures should be followed in cold weather conditions.