Curv Aero CurvAero Blog
Practical articles on FAA airspace, obstruction evaluation and aviation data, written for the people who build near airports.
Newest first.
FAA Filing for Wind Turbines and Met Towers: The 2026 Rules
The 90-day filing deadline, new met tower notice requirements, turbine lighting and aircraft detection lighting systems under AC 70/7460-1N.
Read articleCell Tower FAA Notice and FCC ASR: How They Fit Together
When a tower or rooftop antenna needs Form 7460-1, how the FAA determination feeds FCC Antenna Structure Registration, colocations, and what owners owe after construction.
Read articleFAA Notice of Presumed Hazard: What It Means and What to Do Next
Why the FAA issues a Notice of Presumed Hazard (now a Notice of Preliminary Findings), how to read the letter, and the realistic ways to resolve it.
Read articleDo Construction Cranes Need FAA Notice?
When a crane needs a 7460-1 even if the building does not, how to file it as a temporary structure, what determinations require, and crane marking and lighting.
Read articleDo I Need to File FAA Form 7460-1? A 5-Minute Check
Four questions about height, location and nearby airports decide whether your tower, building, crane or turbine needs FAA notice, with three real scenarios.
Read articlePart 77 Imaginary Surfaces Explained
The five imaginary surfaces around every public-use runway — primary, approach, transitional, horizontal and conical — with a full dimension table and worked examples.
Read articleHow to File FAA Form 7460-1: A Step-by-Step Guide
Deadlines, what each of the 21 form items means, coordinate and height rules, common mistakes and what happens after you file.
Read article14 CFR 77.9 Notice Criteria: When You Must File FAA Form 7460-1
The 200 ft rule, the 100:1, 50:1 and 25:1 notice surfaces, roads and railroads, on-airport work and the exceptions, with worked examples.
Read articleLooking for the reference guides?
Our resources cover the 14 CFR 77.9 notice criteria and the Form 7460-1 filing process in detail.