IMSAFE: Are You Fit to Fly?

The Preflight Nobody Does

Before every flight I check props for nicks, batteries for swelling, and firmware for surprises. Part 107 requires that inspection, and it catches real problems. But the component most likely to fail on any given day isn't on the aircraft. It's the pilot.

The FAA's fix is a six-letter self-check called IMSAFE: Illness, Medication, Stress, Alcohol, Fatigue, Emotion. It takes thirty seconds, costs nothing, and it's the difference between a professional operation and someone hoping today isn't the day. Run it every time you fly — not just the mornings you already suspect the answer.

Six Letters, Six Honest Questions

Illness — am I sick? A head cold seems minor until you're squinting at a screen in Florida sun trying to judge distance to a roofline. Congestion, headache, and general misery all tax the attention you need for seeing and avoiding. Medication — am I taking anything that affects me? Over-the-counter counts. Plenty of cold and allergy meds cause drowsiness, and 'non-drowsy' doesn't mean 'no effect on you specifically.' If the label warns about operating machinery, your drone is machinery.

Stress — is something eating at me? An argument, money pressure, a client blowing up your phone mid-shoot. Stress narrows attention, and a narrowed pilot misses the power line at the edge of the frame. Alcohol — more on the hard numbers below. Fatigue — am I actually rested, or just used to running tired? Emotion — am I angry, grieving, rattled? Strong emotion is a known setup for the hazardous attitudes: impulsivity, macho, the whole lineup.

Any single letter can be a no-go on its own. Two or more flagging at once should end the conversation.

The Silent Ones: Fatigue, Stress, Dehydration

Here's what makes these dangerous: they degrade your judgment before you notice anything is wrong. Fatigue doesn't announce itself — it just quietly makes you slower to spot traffic, sloppier on the sticks, and more willing to accept a marginal plan. By the time you feel tired, your decision-making has already been below par for a while.

Dehydration works the same way, and on a Gulf-coast summer shoot it sneaks up fast. Standing in an open field through a long real estate or construction day, you can lose your edge well before you feel thirsty. The pattern with all three is identical: the impairment arrives first, the awareness arrives late. That's why you can't self-certify in the moment with 'I feel fine.' You plan around them instead — sleep before big shoot days, water in the truck, and a hard personal rule about flying angry or exhausted.

Alcohol: Hard Numbers and the Honest Scrub

The alcohol rules give you two bright lines: no flying within 8 hours of consuming alcohol, and no flying with a blood alcohol concentration of 0.04 or higher — and beyond both numbers, flying while impaired by alcohol or any drug is prohibited outright, no matter what the clock or the breathalyzer says. Note that the two bright lines can flag you independently — nine hours after a heavy night, you can be past the 8-hour line and still impaired, still hungover, and still a lousy pilot. The 8 hours is a minimum, not an all-clear.

Which brings us to the part no checklist can do for you: the honest self-scrub. IMSAFE only works if you answer the questions like a pilot instead of like someone who really wants to fly today. There's always a reason to push — the client is waiting, the light is perfect, you drove an hour to get here. Scrubbing a flight because you're not fit feels expensive in the moment. It's cheaper than the alternative — every scrub story ends better than every crash story — and making that call is exactly what the certificate says you can be trusted to do.

Key takeaways

• IMSAFE — Illness, Medication, Stress, Alcohol, Fatigue, Emotion — is a preflight inspection of the pilot. Run it before every flight, same as you check props.
• Fatigue, stress, and dehydration degrade judgment before you notice. Plan around them with sleep, water, and hard personal rules — don't self-certify with 'I feel fine.'
• Alcohol: minimum 8 hours after drinking and under 0.04 BAC — both are floors, not targets, and flying while impaired is prohibited outright either way. Hungover and 'legal' is still unfit.
• The checklist only works with honest answers. Scrubbing a flight feels expensive in the moment — but every scrub story ends better than every crash story.