AIRPORT ELEVATION/FIELD ELEVATION, The                     機場標高，

highest point of an airport's usable runways measured        指海平面與機場可用跑道最高點之間的距離，單位是英

in feet from mean sea level. In a few countries, the       尺。有幾個國家的機場標高是由機場基準點而決定的。

airport elevation is determined at the airport reference

point.

AIR ROUTE TRAFFIC CONTROL CENTER (ARTCC),                  空中航路交通管制中心（ARTCC ），

A facility established to provide air traffic control service 給在控制空域范圍內使用儀表飛行規(guī)則飛行的飛機提

to aircraft operating on IFR flight plans within controlled 供空中交通管制服務的站臺。

airspace and principally during the enroute phase of

flight.

AIR TRAFFIC CONTROL (ATC), A service operated by           空中交通管制 （ATC ），

appropriate authority to promote the safe, orderly and       由有關當局管理，旨在促進安全，秩序，和效率的空中

expeditious flow of air traffic.                           交通服務。

AIR CYCLE MACHINE, A compressor and turbine on a           渦輪冷卻器，

common shaft for cooling the air in an air conditioning      是裝在同一根轉軸上的壓氣機和渦輪，用于冷卻空調系

system. The air is cooled by expansion from high to low    統(tǒng)中的空氣。空氣經(jīng)壓氣機壓縮后，由熱交換器移去熱量，

pressure across the turbine. The compressor is driven      然后經(jīng)過渦輪，令渦輪帶動壓氣機。通過渦輪之空氣，溫

by the turbine.                                            度下降。

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英漢對照民用航空詞典                                      BOEING

AIR DATA COMPUTER, A computer which produces air       大氣數(shù)據(jù)計算機，

data information, such as altitude and airspeed, based   根據(jù)量取壓力和溫度而產(chǎn)生大氣數(shù)據(jù)資料（高度、空速

on pressure and temperature measurements.              等）的計算機。

AIR TRAFFIC CONTROL, A system comprised of             空中交通管制，

ground and airborne components used to identify, track   一個由地面設備和機載設備組成的系統(tǒng)。用來對飛機進