航空术语词典Dictionary of Aeronautical Terms 中

时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次

lighted airport. An airport with runway and obstruction lighting available.
light-emitting diode. See LED.
light ends (petroleum products). The portions of a petroleum product that boil off first in the process of fractional distillation. Butane is an example of one of the light ends of petroleum fuel.
lightening hole (aircraft structure). A hole cut in a piece of structural material to get rid of weight, or lighten the structure, without losing any strength. A hole several inches in diameter may be cut in a piece of metal at a point where the metal is not needed for strength; for example, in the web of a wing rib. The edges of the hole are flanged (bent outward) to give the metal rigidity. A piece of metal with flanged lightening holes is more rigid than the metal before the lightening holes were cut.
lighter-than-air aircraft. A device sustained in the air by aerostatic lift. Balloons and dirigibles are examples of lighter-than-air aircraft made of materials that are heavier than air, but are filled with a gas (or with hot air) that is less dense than the surrounding air.
When a gas-filled aircraft displaces a greater weight of air than it weighs, aerostatic lift is produced, and the aircraft rises into the air. 14 CFR Part 1: “Aircraft that can rise and remain suspended by using contained gas weighing less than the air that is displaced by the gas.”
light gun (air traffic control). A hand-held directional light signaling device, which emits a brilliant narrow beam of white, green, or red light as selected by the tower controller. The color and type of light transmitted is used to approve or disapprove anticipated pilot action when radio communication is not available.

lightning (atmospheric condition). A bright flash of light in the atmosphere caused by a discharge of electricity from one cloud to another or between a cloud and the earth. Lightning is actually an extremely large spark.
lightplane (type of airplane). A simple, single-engine airplane, used for training or noncommercial flying.
light sensitive diode (semiconductor device). A semiconductor diode whose ability to conduct in a forward direction is determined by the amount of light falling on the PN junction.

light year. The distance traveled by light in one year. The light year is a unit of measurement commonly
used in discussing astronomy and is equal to 5.879 trillion (5.879 x 1012 miles).
lime grease. A semisolid lubricant made by mixing oil with calcium carbonate. Lime grease is more suitable for use around water than grease having a sodium carbonate base.
limit switch (electrical switch). A precision electrical switch, used to turn a mechanism on or off when some part of the mechanism reaches a specific position or location. Limit switches are actuated by a very short movement of the actuating control, and they actuate at exactly the same position of the control each time.
Lindberg fire detection system. A type of aircraft fire detection system that detects either a fire or a general overheat condition. The detector element consists of a sealed, stainless steel tube filled with a material that absorbs gas when it is cool and releases it when it is heated. This tube is fitted with a pressure-actuated switch that initiates a fire warning signal when the tube is heated and releases enough gas to close the switch.

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