Aeromedical factorsQuestion 724 of 934

When does a sinus block occur most often?

  1. During climb
  2. During level flight at altitude
  3. During takeoff
  4. During descent
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Correct answer: During descent

Congestion can plug the sinus openings. This sinus block occurs most frequently during descent.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 17: Aeromedical Factors — Middle Ear and Sinus Problems, page 427

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Questions last reviewed: 18 October 2026