Home › Part 107 Practice Tests › Loading, Performance & Airport Operations Questions › Question 42
When a multirotor hovers very close to the ground, what does ground effect typically do?
- A.It doubles the aircraft's maximum altitude
- B.It locks the aircraft in place so no corrections are needed
- C.It traps air beneath the aircraft, which can make low hovering feel less stable and require small corrections
Correct answer
C. It traps air beneath the aircraft, which can make low hovering feel less stable and require small corrections
Why
Near the surface, propeller wash recirculates and creates unsteady cushion effects. Pilots should expect some wallowing in a very low hover and climb promptly to a clean hover height.
Source: FAA-G-8082-22 Ch. 8 · ACS knowledge area: Determining the Performance of an sUAS · From the Loading, Performance & Airport Operations practice bank (PER-042).