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Aeromedical factorsQuestion 739 of 934

Which rule does 14 CFR part 91 set for alcohol and flying, according to the handbook?

  1. Blood alcohol below .08 percent and 4 hours since the last drink
  2. Blood alcohol below .04 percent and 8 hours since the last drink
  3. Blood alcohol below .04 percent and 12 hours since the last drink
  4. Blood alcohol below .02 percent and 24 hours since the last drink
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Correct answer: Blood alcohol below .04 percent and 8 hours since the last drink

Both conditions must be met. A pilot cannot fly sooner than 8 hours after drinking, even with a low blood alcohol level.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 17: Aeromedical Factors — Alcohol, page 437

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Questions last reviewed: 18 October 2026