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Remote Pilot (Part 107) practice question 21
A stall occurs when the smooth airflow over the unmanned airplane's wing is disrupted and the lift degenerates rapidly. This is caused when the wing
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Correct answer: C. exceeds its critical angle of attack.
A stall occurs when the wing exceeds its critical angle of attack, regardless of speed or weight.
References
- Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), p. 5-3, Aerodynamics of Flight · search it in our library
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Question 21 from the FAA document Unmanned Aircraft General (UAG) Sample Questions (U.S. Government work, public domain) · ACS/LSC code UA.IV.A.K1b. The FAA does not publish an answer key; the answer and explanation are ours, with references. Verify against the current regulations and handbooks.