FAA Private Pilot Helicopter (PRH)Human FactorsMedium
A pilot consumed several alcoholic beverages last night. This morning, a breathalyzer shows a blood alcohol level of 0.02, and only 6 hours have passed since the pilot's last drink. Under 14 CFR 91.17, may this pilot legally act as PIC today?
- AYes, because 6 hours is sufficient for alcohol to metabolize
- BNo, because less than 8 hours have elapsed since consuming alcohol
- CYes, because the BAC is below the 0.04 limit
- DNo, because any alcohol consumption within 24 hours is prohibited
Show answer & explanationAnswer & explanation
Correct answer: B. No, because less than 8 hours have elapsed since consuming alcohol
14 CFR 91.17 requires ALL three conditions to be met: no alcohol within the preceding 8 hours, BAC below 0.04, and not under the influence. Even though the BAC is legal, only 6 hours have passed, violating the 8-hour rule, so the pilot may not act as PIC.
Why the other options are wrong
- A. 6 hours does not meet the regulatory 8-hour minimum, regardless of actual metabolism.
- C. BAC alone is not sufficient; the 8-hour rule is a separate requirement.
- D. The rule specifies 8 hours, not 24 hours.
14 CFR 91.17 Alcohol Rule
A pilot may not act as a crewmember within 8 hours of consuming alcohol, with a BAC of 0.04 or greater, or while under the influence.
- All three conditions must be satisfied simultaneously
- 8-hour rule is independent of actual BAC level
- Often called 'eight hours from bottle to throttle'
Memory trick: '8 hours, .04, and no buzz' — all three gates must be clear.