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Sport Pilot Airplane practice question 13

What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?

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Correct answer: A. Lift equals weight and thrust equals drag.

In straight-and-level, unaccelerated flight the forces are in equilibrium: lift equals weight and thrust equals drag.

References

Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), p. 5-1, Aerodynamics of Flight · search it in our library

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Question 13 from the FAA document Sport Pilot Airplane (SPA) Sample Questions (U.S. Government work, public domain) · ACS/LSC code PLT241. The FAA does not publish an answer key; the answer and explanation are ours, with references. Verify against the current regulations and handbooks.