Alcohol & Flying
FAR 91.17 explained, plus DUI/DWI reporting.
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Good questions
Pilot & Flight-Training FAQ
Straight answers to the questions students and pilots ask most often. For a deeper look at any topic, follow the links to the full guides.
Common Questions
How long must I wait after drinking before flying?
FAR 91.17 requires at least 8 hours from “bottle to throttle”, no operating while under the influence, and a blood-alcohol level below 0.04%. With a hangover, allow far more time.
At what altitudes do VFR cruising rules apply?
At 3,000 feet AGL and above. Odd 500-foot altitudes (e.g. 4,500 MSL) for headings 0–179°, even ones (e.g. 5,500 MSL) for headings 180–359°.
Do I need supplemental oxygen at altitude?
It is recommended on flights above 12,500 MSL and at night above 7,000 MSL. Never gauge your need by how you feel, because hypoxia can feel comfortable.
Who has the right of way when aircraft converge?
At roughly 90 degrees, the aircraft on the left yields to the one on the right. Head-on, both turn right. The aircraft being overtaken has priority, and an aircraft in distress overrides all.
What are the minimum safe altitudes over built-up areas?
Over congested areas, an altitude allowing a glide to a safe landing in case of engine failure, generally at least 1,000 feet above the highest obstacle within 2,000 feet — but confirm the exact value in FAR 91.119 for your situation.
What is the minimum fuel for a VFR flight?
For VFR day, enough fuel to fly to the first point of intended landing and then for at least 30 minutes; for VFR night, 45 minutes. These are minimums — add a healthy reserve for safety.
What should I do if the engine fails after takeoff?
Maintain best glide, pick a field or surface ahead, and fly the aircraft first. Communicate on 121.5 if time allows. The specific airspeed and checklist depend on your airplane — rehearse it until it is automatic.
When must I notify the FAA of an address change?
A pilot must provide a new address to the FAA within 30 days after changing permanent mailing addresses. Details are found in Part 61.