N.Average Day-Night Sound Level (DNL). Average day-night sound level is the FAA standard measure for determining the cumulative exposure of individuals to noise. DNL is the equivalent of noise levels produced by aircraft operations during a 24-hour period, with a ten-decibel penalty applied to the level measured during nighttime hours (10:00 p.m. to 7:00 am). O. Conical Surface. An element of the airport imaginary surfaces that extends outward and upward from the periphery of the horizontal surface at a slope of 20:1 for a horizontal distance of 4,000 feet and to a vertical height of 350 feet above the airport elevation. P. Department of Aviation. The Oregon Department of Aviation, formerly the Aeronautics Division of the Oregon Department of Transportation. Q. FAA. Federal Aviation Administration. R. FAA's Technical Representative. As used in DCC 18.80, the federal agency providing the FAA with expertise on wildlife and bird strike hazards as they relate to airports. This may include, but is not limited to, the USDA-APHIS-Wildlife Services. S. FAR. Regulation issued by the FAA. T. FAR Part 77. Regulation, Part 77, “Objects Affecting Navigable Airspace,” establishes standards for determining obstructions to navigable airspace. U. Height. The highest point of a structure or tree, plant or other object of natural growth, measured from mean sea level. V.Horizontal Surface. A horizontal plane 150 feet above the established airport elevation, the perimeter of which is constructed by swinging arcs of specified radii from the center of each end of the primary surface of each runway of each airport and connecting the adjacent arcs by lines tangent to those arcs. The radius of each arc is: 1. 5,000 feet for all runways designated as utility. 2. 10,000 feet for all other runways. 3. The radius of the arc specified for each end of a runway will have the same arithmetical value. That value will be the highest determined for either end of the runway. When a 5,000-foot arc is encompassed by tangents connecting two adjacent 10,000-foot arcs, the 5,000-foot arc shall be disregarded on the construction of the perimeter of the horizontal surface. W. Non-precision Instrument Runway. A runway having an existing instrument approach procedure utilizing air navigation facilities with only horizontal guidance, or area type navigation equipment, for which a straight-in non-precision instrument approach has been approved, or planned, and for which no precision approach facilities are planned or indicated on an FAA-approved airport layout plan or other FAA planning document. X. Non-Towered Airport. An airport without an existing or approved control tower on June 5, 1995. Y.Obstruction. Any structure or tree, plant, or other object of natural growth that penetrates an imaginary surface. Z. Other than Utility Runway. A runway that is constructed for and intended to be used by turbine- driven aircraft or by propeller-driven aircraft exceeding 12,500 pounds gross weight. AA.Precision Instrument Runway. A runway having an existing instrument approach procedure utilizing air navigation facilities that provide both horizontal and vertical guidance, such as an Instrument Landing System (ILS) or Precision Approach Radar (PAR). It also means a runway for which a precision approach system is planned and is so indicated by an FAA-approved airport layout plan or other FAA planning document.
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