CORRECT!

10). Why is frost considered hazardous to flight?

a). Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability.
b). Frost changes the basic aerodynamic shape of the airfoils, thereby decreasing lift.
c). Frost slows the airflow over the airfoils, thereby increasing control effectiveness.
The answer is:
a). Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability.

Frost deposited on the wings (and tail surfaces) is usually rough in texture. It tends to adhere to the wing's aerodynamic shape, thus maintaining the shape of the airfoil. But, an airfoil depends on smooth flow over the surface to provide the lift it was designed to produce. The roughness of the frost acts essentially to disrupt the smooth flow of air over the surface and the overall lifting capability of the airfoil is reduced.

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