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AerodynamicsQuestion 445 of 934

At what height is ground effect most realized on approach to touchdown?

  1. More than the wingspan above the surface
  2. Less than the wingspan above the surface
  3. Only within 10 feet of the surface
  4. About 500 feet above the surface
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Correct answer: Less than the wingspan above the surface

As the aircraft nears touchdown, ground effect is most realized at altitudes less than the wingspan.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 5: Aerodynamics of Flight — Ground Effect, page 109

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Questions last reviewed: 18 October 2026