If a crewmember consumed alcohol 9 hours before acting as crew, may they perform duties?

• A. Yes
• B. No
• C. Only if sober
• D. Only if re-evaluated by medical staff

Answer: (A)

A crewmember must not act within a certain window after consuming alcohol to ensure impairment has worn off. The rule typically sets an eight-hour buffer from the last drink before acting as crew, so once nine hours have passed, the likelihood of impairment is greatly reduced. If they are no longer impaired and there are no signs of intoxication, they may perform duties. That’s why this scenario is acceptable.

So the best fit is that they may perform duties because more than eight hours have elapsed and impairment is unlikely. The other options would imply additional conditions (being sober beyond the eight-hour rule, or requiring medical reevaluation) that aren’t necessary given a nine-hour interval with no observable impairment.