Snow, ice, or frost contamination may be removed from the airplane's surfaces using which approved technique?

The approved technique for removing snow, ice, or frost contamination from an airplane's surfaces by repositioning the airplane into the sun is based on the principle of utilizing natural heat to facilitate melting. Sunlight can effectively raise the temperature of the surfaces and help clear off any accumulated frost or light ice, making it a practical and safe option in certain conditions.

This method is particularly effective as it requires no specialized equipment and relies on the available environmental conditions. It is a common practice in aviation to leverage solar heat in order to enhance safety and ensure that critical surfaces are clear before a flight.

Other methods, such as using a broom or brush, could potentially damage the aircraft's surface or leave contaminants behind, while changing the airplane's altitude or applying heat to the engines may not directly address the issue of contamination on the aircraft’s wings or control surfaces. Hence, repositioning into the sun stands out as a safe and effective practice in dealing with frost and ice on airplanes.