Takeoff is permitted with frost adhering to which area if surface features can still be distinguished?

• A. Upper Fuselage
• B. Nose Cone
• C. Wing Leading Edge
• D. Tail

Answer: (A)

The key idea is that frost is only allowed in areas that don’t directly affect lift, control, or the aircraft’s radar/shape, as long as you can still see the surface features clearly to confirm there’s no ice where it would matter. The upper fuselage is the area that is least critical to aerodynamic performance during takeoff. Frost on the upper fuselage doesn’t alter the wing’s lift-generating surfaces or the tail’s stability, so if the frost is light enough that you can still distinguish the surface features, takeoff can be permitted. Frost on the wing leading edges or tail would disrupt airflow and control, and frost on the nose cone can affect radar and nose airflow, so those areas aren’t acceptable.