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die whose shape is that of the inside of the part to be spun. The lathe is turned at a high speed, and the
metal is forced against the die with a wooden tool.
metal spraying. A method of covering a material with a coating of metal. The metal to be used for the
coating is melted and sprayed out with hot, high-velocity compressed air. Metal spraying is used to cover a
steel part with aluminum to prevent corrosion, and it can also be used to cover a nonconductive material,
such as wood or paper, with metal to make it electrically conductive.
metastable compound. A chemical compound that is stable under some conditions, but unstable under
others.
meteor. A small particle of solar matter that is visible only as it becomes incandescent (glows because of
its extremely high temperature). The high temperature is caused by friction as the meteor falls through the
earth’s atmosphere.
Meteors are made of metal or rock or a combination of metal and rock. They are often called
“shooting stars” or “falling stars,” and millions of burned-out particles of meteors fall on the earth each day
as dust.
meteorological impact statement (air traffic control). See MIS.
meteorological visibility. A main category of visibility which includes the subcategories of prevailing
visibility and runway visibility. Meteorological visibility is a measure of horizontal visibility near the
earth’s surface, based on sighting of objects in the daytime or unfocused lights of moderate intensity at
night.
meteorology. The branch of science that deals with the physical properties of the atmosphere. Meteorology
deals with the way weather conditions develop and change.
meter. The basic unit of length measurement in the metric system. One meter is equal to one ten-millionth
of the distance between the equator and the earth’s north pole. The length of the standard meter is marked
on a special bar of platinum alloy deposited in Paris, France.
One meter is equal to 1,650,763.73 wavelengths of the orange light emitted when an electric arc
passes through krypton gas. One meter is also equal to 39.37 inches, and in the metric system the meter can
be changed into millimeters, centimeters, and kilometers by dividing or multiplying by units of ten.
meter fix time/slot time (air traffic control). A calculated time to depart the meter fix in order to cross the
vertex at the actual calculated landing time (ACLT). This time reflects descent speed adjustment and any
applicable time that must be absorbed prior to crossing the meter fix.
metering (air traffic control). A method of time-regulating arrival traffic flow into a terminal area so as
not to exceed a predetermined terminal acceptance rate.
metering fix (air traffic control). A fix along an established route from over which aircraft will be
metered prior to entering terminal airspace. Normally, this fix should be established at a distance from the
airport which will facilitate a profile descent 10,000 feet above airport elevation or above.
metering jet. A precision orifice used to restrict the flow of a fluid. The diameter and length of the orifice,
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 382
and the approach and departure angles to and from the orifice, all determine the amount of fluid that can
flow under a given pressure drop across the orifice. See illustration for calibrated orifice.
metering pin. A flow control device in a metering orifice, used to vary the amount of fluid that can flow
through it. The area of the orifice with the pin fully in it determines the minimum amount of fluid that can
flow, and the area of the jet with the pin all the way out determines the maximum amount of flow. The
shape, or contour, of the metering pin determines the amount of fluid that can flow with the pin in any
position other than full in or full out.
meter-kilogram. The amount of work done when one kilogram of force acts through a distance of one
meter.
methanol (wood alcohol). A poisonous liquid alcohol, formed by the distillation of wood pulp. Methanol
is used as a fuel, a solvent, and an antifreeze agent.
METO power (maximum except takeoff power). A rating for aircraft reciprocating engines. METO
power is the maximum power allowed to be continuously produced by an engine. Takeoff power is usually
limited to a given amount of time, such as one minute or five minutes.
metric horsepower. A unit of power equal to 75 meter-kilograms of work per second. One metric
horsepower is also equal to approximately 753.5 watts of power.
metric prefixes. The metric system operates on the basis of each unit being a multiple of ten times the base
unit. Each value, or multiple of ten, has its own prefix name. The prefixes most commonly used in
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航空术语词典Dictionary of Aeronautical Terms 中(130)
