航空術(shù)語詞典Dictionary of Aeronautical Terms 中

時(shí)間：2011-03-11 23:13來源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次

ILS Category I An ILS approach procedure which provides for approach to a height above touchdown of not less than 200 feet and with runway visual range of not less than 1,800 feet.
ILS Category II An ILS approach procedure which provides for approach to a height above touchdown of not less than 100 feet and with runway visual range of not less than 1,200 feet.
ILS Category IIIA An ILS approach procedure which provides for approach without a decision height minimum and with runway visual range of not less than 700 feet.
ILS Category IIIB An ILS approach procedure which provides for approach without a decision height minimum and with runway visual range of not less than 150 feet.
ILS Category IIIC An ILS approach procedure which provides for approach without a decision height minimum and without runway visual range minimum.
IMC (instrument meteorological conditions) (air traffic control). Meteorological conditions expressed in terms of visibility, distance from cloud, and ceiling less than the minimums specified for visual meteorological conditions.
IMEP (indicated mean effective pressure). The average pressure existing inside the cylinder of a reciprocating engine during its power stroke. IMEP, expressed in pounds per square inch, is a measured pressure which contrasts with brake mean effective pressure, BMEP, which is a computed pressure. The horsepower found when IMEP is used in the horsepower formula is indicated horsepower, IHP.
“Immediately” (air traffic control). A term used by ATC when such action compliance is required to avoid an imminent situation.
immersion heater. An electrical heater used to heat liquids by immersing (submerging) the heater in the liquid.
immiscible. Not able to mix. Liquids are immiscible if they will not mix with each other. Water and oil are immiscible. If a bottle containing both water and oil is agitated, the oil and water will form an emulsion. But when the bottle sits for a while without further agitation, the oil and water will separate, the oil rising to the top of the water.
impact extrusion. A form of extrusion made by forcing cold metal through a die by striking it a hard blow. This blow comes from a punch driven at a high velocity.
impact ice. Ice that forms on an aircraft flying through freezing rain or other visible moisture when the air temperature is in the freezing range (between 0° and –15°C). Impact ice forms on the leading edges of the wing and tail surfaces and disturbs the smooth flow of air over these surfaces. Impact ice also forms on the engine inlet air filters and can stop an engine functioning unless inlet air is taken from an alternate source.
Impact ice forming on the inlet air duct of a jet engine can break off and be pulled through the engine, causing severe damage to the compressor blades.
impact pressure. Pressure resulting when moving air is stopped. Impact pressure picked up by a pitot tube is called pitot pressure.
impact wrench. A power-driven tool used to install and remove nuts, bolts, and screws. The torque delivered to the fastener by an impact wrench is in a series of sharp blows or impacts.

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