| Section A | A index | 361-369 of 917 terms |
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airport elevation—(Also called field elevation, runway elevation, aerodrome elevation, airport height.) The officially designated elevation of an airport above mean sea level, in international usage denoted by the symbol Ha. It is the elevation of the highest point on any of the runways of the airport. Compare station elevation.
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airshed model—A model designed to study and predict the air quality of a given region, usually of dimensions of the order of hundreds of kilometers. The models typically include sources of primary pollutants, the meteorology of the region being modeled, and a chemical scheme that describes the production of secondary pollutants. Airshed models of urban regions are the most common.
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airspeed—The speed on an exposed (usually airborne) object relative to the atmosphere. In a calm atmosphere, airspeed equals ground speed.
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airway—An officially designated air route with sectors defined as specific courses to or from directional radio stations.
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