The short answer
A data center site needs FAA airspace screening if any permanent structure, exhaust stack, antenna or construction crane could exceed 200 feet above ground level, or if the site sits inside the notice surfaces around a public-use airport or heliport. In those cases the developer must file FAA Form 7460-1 (Notice of Proposed Construction or Alteration) and receive a determination before building. Screen this before land control, because a height cap or a lengthy aeronautical study can change the campus layout, the crane plan and the schedule.
What is FAA airspace screening?
Airspace screening is a check of whether proposed structures on a parcel could affect navigable airspace under 14 CFR Part 77. It answers three questions:
Does any part of the project trigger FAA notice?
If so, is there a realistic risk of a height limit, marking and lighting conditions, or a hazard determination?
Are there military or radar constraints that sit outside the standard FAA process?
When does Part 77 notice apply?
Under 14 CFR 77.9, notice is generally required for:
| Trigger | What it means for a data center |
|---|---|
| Any structure more than 200 ft above ground level | Rare for buildings, but possible for communications towers and some cranes |
| Within 20,000 ft of a public-use or military airport with a runway longer than 3,200 ft, exceeding a 100:1 slope from the nearest runway | A 60 ft building roughly 6,000 ft from a runway can trigger notice |
| Within 10,000 ft of an airport whose longest runway is 3,200 ft or less, exceeding a 50:1 slope | Small general aviation airports matter more than teams expect |
| Within 5,000 ft of a public-use heliport, exceeding a 25:1 slope | Hospital and municipal heliports near urban infill sites |
| Temporary construction equipment that meets any of the above | Tower and crawler cranes often trigger notice even when the finished building does not |
The FAA's online Notice Criteria Tool gives a fast first answer for a given coordinate and height. Treat it as a screen, not a determination.
Which parts of a data center campus create height risk?
Building roofline plus rooftop equipment. Cooling units, screens and parapets add height.
Generator and turbine exhaust stacks. On-site power plans often push stacks well above the roof.
Substation structures and transmission tie-in. Dead-end structures and new line poles can approach notice surfaces near airports.
Communications towers. Microwave or carrier towers on campus can exceed 200 ft.
Construction cranes. The tallest object on site during construction is usually the crane, and each crane position may need its own filing.
How to screen a site before LOI
Map every airport, heliport and military facility within about 4 miles of the parcel. Include private-use fields, which do not trigger Part 77 notice in the same way but can still raise local zoning and safety issues.
Set worst-case heights. Use the tallest plausible building, stack and crane, not the concept massing.
Run the Notice Criteria Tool at the parcel corners and the planned building footprint.
Check local airport zoning overlays. Many counties adopt height and land-use overlays around airports that are stricter than federal notice triggers.
Check military and radar constraints. Training routes, special use airspace and radar sites are coordinated through the DoD Siting Clearinghouse, separate from the FAA filing.
Record the result in the site memo as clear, notice required with low risk, or notice required with material risk.
Decision rules
No notice triggered at worst-case heights: proceed, and recheck if stack or crane heights change.
Notice triggered, structure well below obstruction standards: proceed, and file early so the determination is in hand before construction mobilization.
Notice triggered, structure near or above obstruction standards: price the risk. Model the layout with lower stacks or shifted buildings, and ask for an airspace consultant review before LOI.
Inside an airport zoning overlay with hard height caps: treat as a site constraint on par with power and zoning. Confirm the buildable envelope before committing.
How to sequence the Form 7460-1 filing
The FAA asks for notice at least 45 days before construction starts, and a full aeronautical study can take longer.
File permanent structures and each crane position as separate cases where locations or heights differ.
A Determination of No Hazard usually carries an expiration date, so align filings with the real construction window.
Expect possible conditions such as obstruction marking and lighting, which affect design and cost.
What the client gets from Build
Build sources sites, validates them and bundles the services needed to get from a shortlist to usable land. Airspace is one of the validation layers checked alongside power deliverability, zoning, fiber, water and environmental risk, so a height constraint shows up in the site memo before land control, not during permitting. If a site fails on airspace, Build brings another validated site instead of letting the deal stall.
Checklist
Airports, heliports and military facilities mapped
Worst-case building, stack and crane heights set
Notice Criteria Tool run at key coordinates
Local airport zoning overlay checked
DoD Siting Clearinghouse exposure checked
Filing timeline aligned with construction schedule