Obstruction Standards FAR Part 77.23 – Standards for Determining Obstructions FAR Part 77.23(a)(2) – Obstruction Standards FAR Part 77.25(a-e) – Civil Airport Imaginary Surfaces Things You Should Know FCC Acknowledges Errors with TowAir Online Software FAA announces new requirements for visual approaches into airports Notice of Proposed Rulemaking (NPRM) Safe, Efficient Use and Preservation of Navigable Airspace IFR Departure Surface (40:1) and Climb Gradient Private airports with procedures are now protected by FAA Contact Us Need an Airspace specialist to help? Send a message