Obstruction Impacts: Wind Turbines / Radio Antennas / Cell Towers / Refineries / Power Generating Stations

Williams Aviation Consultants, Inc is committed to providing a complete and thorough analysis of Obstruction Impact issues and to the development of innovative and workable solutions for the height restrictions, marking and lighting issues and other problems encountered by project developers.


A frequent problem experienced by developers is the receipt of a “Notice of Presumed Hazard” from the Federal Aviation Administration (FAA) for a proposed structure or for modifications to an existing structure.  This notice is one possible response from the FAA to the filing of FAA Form 7460-1 “Notice of Proposed Construction or Alteration”.


Often unknown to the developer is the existence of stricter federal requirements for Obstructions near airports and other landing facilities.  Developers are generally unaware of the potential impact of the Federal Air Regulation (FAR) Part 77 imaginary surfaces around airports, which were established to protect departing and arriving aircraft from structures.


All Obstructions including Wind Turbines, Antennas, Cell Towers, Refineries and Power Generating Station may have height restriction issues that will have an FAR Part 77 impact.


Additionally, Wind Turbine Farms can have distinct Obstruction lighting problems and may create electronic interfere issues with RADAR facilities.


Radio antennas and cell towers may have navigational aid Radio Frequency (RF) interference issues and issues with Global Navigation System (GPS) equipment around airports.


Refineries and power generating stations may have unique Obstruction marking and lighting problems that often require non standard solutions.  Proposed power generating plants may encounter pilot overflight issues concerning the effects of stack exhaust plumes.


Williams Aviation Consultants Inc. offers our expertise to developers as a viable resource concerning FAR Part 77, Airspace Obstruction/Terminal Instrument Procedures and of Advisory Circular AC 70/7460-1K, Obstruction Marking and Lighting.  A developer can avoid costly mistakes and delays in the development and construction of their projects by thoroughly understanding the FAA`s process for evaluating proposed structures.


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