A remote pilot had a blood alcohol level of .05 percent exactly 8 hours after drinking. According to the remote pilot study guide, what must the pilot do before flying?

Why: The study guide explains that 14 CFR part 91 requires both conditions to be met: blood alcohol below .04 percent AND at least 8 hours since drinking. "A pilot with a blood alcohol level of .04 percent or greater after 8 hours cannot fly until the blood alcohol falls below that amount." The 8-hour clock passing does not override a blood alcohol level still at or above .04 percent.

• Treats the 8-hour rule as the only requirement and ignores that blood alcohol must also be below .04 percent — exactly the mistake the study guide warns against.
• Invents a flat additional 8-hour wait regardless of blood alcohol level; the actual rule is concentration-based once the first 8 hours have elapsed, not a fixed second waiting period.