时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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enroute automated radar tracking system. See EARTS. enroute descent (flight operations). Descent from enroute cruising altitude which takes place along the route of flight. enroute flight advisory service (EFAS). This service, also known as flight watch, is designed to provide, upon pilot request, timely weather information pertaining to the type of flight, intended route of flight, and altitude. enroute high-altitude charts. Aeronautical charts for enroute instrument navigation (IFR) in the high-altitude stratum. Information includes the portrayal of jet routes, identification and frequencies of radio aids, selected airports, distances, time zones, special use airspace, and related information. enroute low-altitude charts. Aeronautical charts for enroute instrument navigation (IFR) in the low-altitude stratum. Information includes the portrayal of airways, limits of controlled airspace, position identification and frequencies of radio aids, selected airports, minimum en route and minimum obstruction clearance altitudes, airway distances, reporting points, restricted areas, and related data. enroute minimum safe altitude warning. See EMSAW. entrained air. Air trapped in a liquid, forming an emulsion with it. When lubricating oil passes through an engine, it picks up large quantities of air, and this entrained air increases the volume of the oil, making it less effective as a lubricant. Entrained air must be removed from the oil by a deaerator system, an air-oil separator, before it is sent back through the engine. entrained water. Water held in suspension in the fuel carried in an aircraft fuel tank. Entrained water does not cause many problems on airplanes powered with reciprocating engines, but it does cause serious problems with turbine-powered aircraft. This is because turbine-powered aircraft fly at much higher altitude, where the air is so cold the entrained water condenses out and freezes on the fuel filters. This ice shuts off the flow of fuel to the engines. The fuel used in many turbine-powered aircraft is treated with an anti-icing agent which mixes with and lowers the freezing point of the water condensed from the fuel in the tanks. entropy. A measure of the capacity of a thermodynamic system to undergo a spontaneous change. Entropy varies with the change in the ratio of the increment of heat taken in to the absolute temperature at which it is absorbed. envelope method of covering an airplane. A method of covering an airplane by slipping a machine-sewed fabric envelope over the structure. After the envelope is slipped over the structure, the opening is hand-sewed closed, or the fabric is otherwise fastened to the structure. The fabric covering for the wings is laced to each of the ribs, and the fabric is shrunk. environmental control systems (aircraft system). The systems in an aircraft that make it possible for the human occupants to function at high altitude. Environmental control systems include supplemental oxygen, air conditioning, heaters, and pressurization systems. |
