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航空术语词典 Dictionary of Aeronautical Terms 上(113)

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


C-clamp. A screw-type clamp made in the shape of the letter C. One jaw is fixed, and the other is mounted on a screw.
CD duct. See convergent-divergent duct.
CDI (course deviation indicator). An indicator used with VOR, LORAN, or GPS navigation systems to indicate the direction and relative amount of deviation from the desired course. CDIs are often called Left-Right indicators.
CDU (control display unit). A component in a flight management computer system that contains a cathode-ray tube and a keyboard with alphanumeric keys and mode-select and line-select keys. The CDU allows the flight crew to access the data to be displayed.
Ceconite. The registered trade name for an inorganic aircraft fabric woven of polyester fibers. Ceconite is installed on the structure and then shrunk with heat.
ceiling (meteorological condition). 14 CFR Part 1: “The height above the earth’s surface of the lowest layer of clouds or obscuring phenomena reported as ‘broken,’ ‘overcast,’ or ‘obscuration,’ and not classified as ‘thin’ or ‘partial.’”
ceiling balloon (meteorology). A small, black, helium-filled balloon used to find the height of a base of clouds.
The balloon is released by a weather observer, and the time needed for it to disappear into the clouds is measured. Since both the rate of rise of the balloon and the time it took to disappear into the clouds are known, the height of the base of the clouds can be determined.
ceiling light (meteorology). A light used by weather observers to measure the height of the bottom of a layer of clouds at night. A beam of light, shone vertically upward, makes a spot of light on the bottom of the cloud.
A theodolite (an instrument used to measure angles), located a known distance away from the light, is used to measure the angle up to the spot of light on the cloud base.
By knowing the distance between the theodolite and the ceiling light and the angle measured by the theodolite, the height of the cloud base can be determined.
ceilometer (meteorology). A cloud-height measuring system. A ceilometer projects a beam of light on the cloud base, detects the reflection by a photoelectric cell, and determines the cloud-base height by triangulation.
celestial navigation. A form of navigation used by airplanes and ships. Location fixes are found by observing the angle between the observer and one of the navigational stars, and noting the exact time the observation is made. The exact location of the navigational star at the time of the observation is found by referring to a nautical almanac.
The location on the earth’s surface of the star at the time of observation and the angle between the star and the observer are plotted on a navigational chart. Celestial navigation has been almost entirely replaced by various forms of electronic navigation, which are more accurate and easier to use.
cell (electrochemical). An electrochemical device consisting of two electrodes surrounded by an electrolyte. A potential difference exists between the electrodes that causes electrons to flow.
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