Obstruction Evaluation

Have you received a Notice of Presumed Hazard from the Federal Aviation Administration (FAA) and do you need to mitigate your proposed structure’s impact?


Do you plan to build a structure near an airport and are you unsure of its potential impact?


Do you have questions about the planned location of a structure you plan to build?


Do you have questions about how tall you can build a structure before it becomes a problem for the FAA?


These and similar questions generally surface during the planning and development stages of a construction project and may indicating that an Obstruction Evaluation is in order.


The purpose of an Obstruction Evaluation is to determine what impacts a proposed structure may have on the National Airspace System and to propose mitigation that facilitates FAA approval.


Any proposed structure has the potential to be an Obstruction as it pertains to Federal Air Regulations (FAR) Part 77 and Terminal Instrument Procedures (TERPS) publications.


Both FAR Part 77 and TERPS imaginary surfaces are complex but extremely relevant pieces of airspace designed to protect departing, arriving and enroute aircraft from structures.


Other pertinent yet often overlooked Obstruction Evaluation factors include; VFR (Visual Flight Rules) Traffic Patterns, RF Interference, Radar Interference, Military Training Routes, Military VR routes, Special Use Airspace and Navigational Aids (Navaids).


Williams Aviation Consultants Inc., having performed hundreds of Obstruction Evaluations, will provide project sponsors with expert site analysis.  Williams also has extensive experience in mitigation services with the FAA for sponsors who have received a Notice of Presumed Hazard for their proposed projects.


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