No person may attempt to act as a crewmember of a civil aircraft with .04 percent by weight or more alcohol in the blood.

• A. .04 percent
• B. .08 percent
• C. .02 percent
• D. No limit

Answer: (A)

In aviation, there is a strict limit on how much alcohol you can have in your blood before you’re allowed to act as a crewmember. The threshold is 0.04 percent BAC; once you reach or exceed that level, you are not permitted to attempt to fly. This standard helps ensure your judgment, coordination, and reaction time aren’t impaired during flight.

So the correct rule is that you may not act as a crewmember with 0.04 percent BAC or more. Choices below that level could, in certain circumstances, be permissible (though other factors and regulations still apply), while anything higher than 0.04 or the idea of “no limit” does not fit the rule.