Private Pilot Private Exam

What effect does frost have on lift capability during flight?

1. It enhances lift capability

2. It has no effect on lift capability

3. It decreases lift capability

4. It only affects landing performance

The correct answer is: It decreases lift capability

Frost significantly decreases lift capability during flight due to its impact on the aircraft's wing aerodynamics. When frost accumulates on the wings, it alters the smooth airflow over the wing surface, disrupting the laminar flow and increasing drag. This can lead to a stall at higher airspeeds than usual, requiring a greater angle of attack to achieve the same lift. Essentially, any surface irregularity, including frost, reduces the effective airflow over the wings, ultimately leading to a decrease in the wings' ability to generate lift. Therefore, pilots need to be aware that even a thin layer of frost can compromise the safety and performance of the aircraft during both takeoff and in-flight maneuvers.