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12/5/78 18. AIRPORT ZONING FOR HEIGHT RESTRICTION. AC 150/5300-4B CHG 3 * a. The purpose of zoning to limit the height of objects in the vicinity of airports is to prevent them from interfering with the safe and efficient operations of the airport. An airport zoning ordinance can be an effective method of achieving this and also of generally attaining compatibility of land use in the immediate vicinity of the airport. The ordinance must conform to the prescribed authority of the enabling act. b. It has been recognized that guidance is needed in the preparation of an airport airspace zoning ordinance. To this end, Advisory Circular 150/5190-4, A Model Zoning Ordinance to Limit Height of Objects Around Airports, has been published. The model ordinance defines and provides for the establishment of various zones and prescribes height limitations for each zone required to prevent the.,ereation or establishment of objects which may interfere with the operation of the airport. It also provides for the granting of variance from the ordinance where it is duly found that the proposed object would not interfere with the safe and efficient operations of the airport. c. Airport zoning ordinances developed for height limitations will not insure compatible land use adjacent to or in the immediate vicinity of the airport. This must be accomplished through zoning to control land use in these areas. However, zoning to limit height of objects around airports is a very important consideration for land use control for the airport influence area'and should be an integral part of off -airport land use controls. While detailed treatment is not a part of Advisory Circular 150/5190-4, the restriction of off -airport land uses to those compatible with the airport should be considered by local authorities in drawing up zoning ordinances. * Also in striving to achieve compatible land uses, it is important to coordinate all zoning closely with regional and local planning agencies. The adoption of an airportzoning ordinance is considered a necessary step in the planning and development of an airport. 19. LAND ACQUISITION. a. The amount of land needed for any one of the three groups of utility airports will vary considerably. Factors, such as length and number of runways, lateral clearances, areas required for buildings, hangars, aircraft tiedown, transient apron, automobile parking, and future expansion of the airport, should be studied in detail, and a plan for the construction and expansion of the airport, such as an airport layout plan, should be developed. Chap 5 Par 18 Page 17