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FAR Part 77 Surfaces. The Federal Aviation Administration’s Federal Aviation Regulations (FAR) Part 77 surfaces are the imaginary airspace surfaces established with any relation to each runway of an airport. There are five types of surfaces: (A) primary, (B) approach, (C) transitional, (D) horizontal, and (E) conical. These surfaces are above and around airports and require protection from potential obstructions that might interfere with airport traffic and potentially create a safety risk to aircraft occupants and persons on the ground. An object or structure with an elevation higher than the FAR Part 77 surface elevation is considered to penetrate the FAR Part 77 surfaces and constitutes an obstruction to navigable airspace. “Navigable airspace” is defined by the FAA pursuant to CFR Title 14, Part 77, imaginary surfaces. (Ord. 6838 § 1 (Exh. A), 2021.)