Even if 8 hours have passed and the alcohol concentration is below 0.04, a crewmember still may not operate if the person is

• A.drinking coffee or another caffeinated drink during the operation at the control station.
• B.under the influence of alcohol in a way that adversely affects safety.
• C.tired from a normal night's sleep the day before, even though the pilot feels alert and ready.

Why

The 8-hour and 0.04 standards do not create a safe harbor for a person who is still under the influence to a degree that affects safety. Meeting the numeric limits while still impaired does not make the operation lawful.

Source: 14 CFR 107.27 · ACS knowledge area: Applicable Regulations · From the Regulations & Registration practice bank (REG-078).

Practice this category as a full test

More Alcohol Influence Standard questions

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• How much does FAA registration cost for one small unmanned aircraft, and how long is the registration valid?
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