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<br />Displaced threshold: a threshold that is located at a point on the runway other <br />than the designated beginning of the runway. <br /> <br />Distance measuring equipment (DME): equipment (airborne and ground) used <br />to measure, in nautical miles, the slant range distance of an aircraft from the DME <br />navigational aid. <br /> <br />DNL: day-night noise level. The daily average noise metric in which that noise <br />occurring between 10:00 p.m. and 7:00 a.m. is penalized by 10 times. <br /> <br />Downwind leg: a flight path parallel to the landing runway in the direction <br />opposite to landing. <br /> <br />Duration: length of time, in seconds, a noise event such as an aircraft flyover is <br />experienced. (May refer to the length of time a noise event exceeds a specified <br />threshold level.) <br /> <br />Enplaned passengers: the total number of revenue passengers boarding aircraft, <br />including originating, stop-over, and transfer passengers, in scheduled and non- <br />scheduled services. <br /> <br />Fixed base operator (FBO): a provider of service to users of an airport. Such <br />services include, but are not limited to, fueling, hangaring, flight training, repair <br />and maintenance. <br /> <br />General aviation: that portion of civil aviation which encompasses all facets of <br />aviation except air carriers holding a certificate of convenience and necessity, and <br />large aircraft commercial operators. <br /> <br />Glide slope: electrical equipment that emits signals which provide vertical <br />guidance by reference to airborne instruments during instrument approaches such <br />as an ILS, or visual ground aids, such as V ASI, which provide vertical guidance for <br />a VFR approach or for the visual portion of an instrument approach and landing. <br /> <br />Global positioning system (GPS): a navigational technology based on a <br />constellation of satellites orbiting approximately 11,000 miles above the surface of <br />the earth. <br /> <br />Ground effect: the excess attenuation attributed to absorption or reflection of <br />noise by man-made or natural features on the ground surface. <br /> <br />Instrument approach: a series of predetermined maneuvers for the orderly <br />transfer of an aircraft under instrument flight conditions from the beginning of the <br />initial approach to a landing, or to a point from which a landing may be made <br />visually. It is prescribed and approved for a specific airport by competent authority. <br /> <br />B-2 <br />