Do you have to
file a 7460-1?
Enter a latitude, a longitude and a structure height. The CurvAero Part 77 report tells you whether federal regulation obliges you to give the FAA notice of the construction — and shows the rule and the measurement that produced the answer.
Notice is owed to the FAA at least 45 days before construction begins or before a permit application is filed, whichever is earlier. Filing when you did not need to costs weeks; not filing when you did can stop the build.
Determination
Notice required
Triggered by § 77.9(b) — 100:1 notice surface
- Site
- 41.9742° N, 87.9073° W
- Structure height
- 185 ft AGL
- Nearest runway
- 10L/28R — 13,000 ft
- Distance to runway
- 11,420 ft
- Surface exceeded by
- +71 ft
Illustrative figures. Every report states the data vintage it was run against.
What triggers notice
Four thresholds in 14 CFR 77.9
Meeting any one of them obliges you to notify the FAA. The report checks all four against your coordinate and tells you which, if any, applied.
More than 200 feet above ground
Any construction or alteration standing more than 200 ft above ground level at its site requires notice, wherever in the country it is — no airport needs to be nearby.
Inside a sloped notice surface near an airport
Notice is required when the structure exceeds an imaginary surface that extends outward and upward from the nearest point of the nearest runway, at a slope set by that runway's length. The report measures this for every public-use and military airport in range.
- chevron_right100:1 for 20,000 ft — runway longer than 3,200 ft
- chevron_right50:1 for 10,000 ft — runway 3,200 ft or shorter
- chevron_right25:1 for 5,000 ft — heliport landing and takeoff area
A traverse way that must be raised
A highway, railroad or waterway is treated as raised by the height of the tallest mobile object that uses it, so a structure clear on paper can still trigger notice.
- chevron_right17 ft — interstate highway
- chevron_right15 ft — any other public roadway
- chevron_right10 ft — private road
- chevron_right23 ft — railroad
On or near a proposed airport
Work on or near an airport that is itself the subject of a notice or proposal already on file with the FAA requires notice, including airports not yet built.
Section 77.15 removes the obligation in specific cases — most often a structure shielded by an existing permanent object of equal or greater height. The report evaluates those exceptions rather than leaving them for you to argue.
What you enter
Six fields, then the report
Where
- Latitude and longitude
- Decimal degrees or DMS, referenced to NAD83.
- Site elevation
- Ground elevation above mean sea level; derived from terrain data when omitted.
What
- Structure height
- Height above ground level, including antennas, lightning rods and crane reach.
- Structure type
- Tower, building, wind turbine, crane, pole or transmission line.
When
- Construction dates
- Start and end dates — a crane is temporary, and that changes the filing.
- Marking and lighting
- Any obstruction marking or lighting already proposed for the structure.
What the report contains
An answer you can show your reviewer
The determination
A plain answer — notice required, or not required — with the paragraph of 77.9 that produced it and the arithmetic behind it.
Nearest airports
Every airport that put the site inside a notice surface, with distance, bearing, runway length and the slope applied.
Surface penetrations
Where the structure breaks a Part 77 imaginary surface, by how much, and which surface — horizontal, conical, primary, approach or transitional.
Exceptions checked
The 77.15 exceptions that can remove the obligation, such as a structure shielded by an existing permanent object, each shown as applied or not.
A filing-ready summary
The site data the 7460-1 asks for, collected in the order the form asks for it, so the filing is transcription rather than research.
A dated, repeatable record
Every report records its inputs and the data vintage it ran against, so a result can be defended months later or re-run when the design changes.
A screening, not an FAA determination
This report establishes whether 14 CFR 77.9 requires you to give notice, and prepares the site data for that filing. Only the FAA can issue a determination of hazard or no hazard, and only the FAA can accept a 7460-1 — filed through its Obstruction Evaluation / Airport Airspace Analysis portal.
Run your coordinate
Send us the site and the height. We will come back with the determination, the rule behind it, and what filing would involve.