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FAA Part 77 Quick Check
Pick your nearest airport, then enter your structure height and the distance to it. This tool computes a simplified screening estimate to tell you whether your project likely penetrates a FAA Part 77 notice surface — and whether you should file a Form 7460-1.
PART 77 QUICK CHECK RESULT
Directional estimate only, not an FAA determination. A "likely clear" result does not mean notice is not required: whether 14 CFR 77.9 requires you to file Form 7460-1 is your call as the proponent, and when in doubt, file.Disclaimer
See the full breakdown
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Criterion analysis
Methodology note
This estimate uses the airport reference point elevation as both the site ground elevation and the base of the 100:1 notice surface, with the straight-line distance you entered. A full LOS Analyzer screening additionally computes the horizontal, conical, and transitional surfaces; places each individual runway end; pulls terrain elevation along the actual sightline; and corrects for earth curvature and atmospheric refraction — all factors this quick-check cannot model. Results here are a go/no-go directional signal, not a determination.
Get a full Part 77 + line-of-sight screening
The full screening runs the complete terrain-aware, curvature-corrected engine against all Part 77 surfaces and generates a Form 7460-1 draft from the same inputs. Your first one is free; each after that is $99.
Run your first full screening freeTerrain-aware · all Part 77 surfaces · curvature-corrected · 7460-1 draft · first report free, then $99