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How long alcohol remains in the body

Remote Pilot (Part 107) practice question 14 of 20 on Operations / Physiology. ACS element UA.V.E.K2 · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONAccording to the Remote Pilot Study Guide, considerable amounts of alcohol can remain in the body for how long?

  1. AAbout 4 hours
  2. BNo more than 8 hours after drinking
  3. COver 16 hours
Show the answer and explanation

Correct answer: C. Over 16 hours

  • A — incorrect Four hours is far shorter than the period the study guide describes; alcohol can remain in the body for over 16 hours.
  • B — incorrect Eight hours is the minimum regulatory interval between drinking and flying, not the length of time alcohol can remain in the body, which the study guide gives as over 16 hours.
  • C — correct The study guide states that considerable amounts of alcohol can remain in the body for over 16 hours, so pilots should be cautious about flying too soon after drinking.

BACKGROUND

The Remote Pilot Study Guide explains that alcohol impairs the efficiency of the human body and is closely linked to performance deterioration. Even in small amounts it can impair judgment, decrease sense of responsibility, affect coordination, constrict the visual field, diminish memory, reduce reasoning ability, and lower attention span. While experiencing a hangover, a pilot is still under the influence of alcohol, and motor and mental impairment remains even if the pilot feels normal. Considerable amounts of alcohol can remain in the body for over 16 hours, so pilots should be cautious about flying too soon after drinking.

STUDY TIP

Distinguish the 8-hour regulatory minimum from the physiological fact that alcohol can persist for over 16 hours.

KEY POINTS

  • Alcohol can remain in the body for over 16 hours.
  • A hangover means the pilot is still under the influence.
  • The 8-hour rule is a minimum; be more conservative.

SOURCES

  • remote_pilot_study_guide.txt ch9 "Alcohol"
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MORE ON OPERATIONS / PHYSIOLOGY

SkyDrill is not affiliated with the FAA. This is an original practice item based on 14 CFR part 107, 14 CFR part 89, and the FAA Remote Pilot – Small UAS Study Guide (FAA-G-8082-22). Regulations and handbooks are revised; confirm details against the current edition.