Private Pilot Private Exam

How does frost affect the lifting surfaces of an airplane during takeoff?

1. Frost increases lift efficiency

2. Frost enhances stability

3. Frost prevents the airplane from becoming airborne

4. Frost decreases drag during takeoff

The correct answer is: Frost prevents the airplane from becoming airborne

Frost has a significant adverse effect on the lifting surfaces of an airplane during takeoff. When frost accumulates on wings and other lifting surfaces, it disrupts the smooth airflow that is crucial for generating lift. The presence of frost alters the wing's shape and can lead to a drop in the overall aerodynamic efficiency. This disruption can prevent the airplane from reaching the necessary lift coefficients to become airborne, thereby hindering takeoff performance. While options regarding increasing lift efficiency or enhancing stability may seem relevant, they do not accurately reflect the impact of frost. Instead, the presence of frost detracts from lift and can lead to early stall conditions. Similarly, drag is likely to increase with frost because it creates roughness on the surface of the wing, further worsening takeoff capabilities. Thus, the correct choice highlights the crucial understanding that frost can prevent the airplane from becoming airborne, which is vital for flight safety and performance.