What must be ensured regarding the wings and control surfaces before an aircraft takes off?

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Ensuring that the wings and control surfaces are free of frost, ice, or snow is crucial before an aircraft takes off because these elements can significantly impair the aircraft's performance and safety. Ice or snow accumulation affects the aerodynamics of the wings by altering their shape and disrupting airflow, which can lead to reduced lift and increased drag. This can result in longer takeoff distances, difficulty in maintaining altitude, and even a risk of loss of control during flight, particularly during critical phases like takeoff and landing.

In cold weather operations, it's essential to perform de-icing or anti-icing procedures prior to departure to maintain the aircraft's safe operating characteristics. This is a fundamental aspect of winter operations to ensure that all aerodynamic surfaces are functioning as designed and that the aircraft is ready for a safe flight.