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英漢對照民用航空詞典                                    BOEING

LOW RANGE RADIO ALTIMETER, A system that             低空無線電高度表，

measures the vertical distance from the airplane to the 一種測量飛機至地形的垂直距離的系統。

terrain.

LRC, Stands for Long Range Cruise speed. Represents  遠程巡航速度，

the typical cruise speed for a given jet airplane; usually 遠程巡航速度的縮寫。代表噴氣式飛機常見的巡航速

expressed as a Mach number.                          度，通常以馬赫數方式表示。

LRRA, SEE - LOW RANGE RADIO ALTIMETER                低空無線電高度表，

                                                       見 Low Range Radio Altimeter．

LRU, SEE - LINE REPLACEABLE UNIT                     航線可換件，

                                                         見 Line Replaceable Unit．

LUBRICANT, A substance used to reduce friction       潤滑劑，

between moving parts. It can be a natural or an artificial 用于減輕運動物體之間產生的磨擦的物質。它可以是天

material.                                            然的或人工制造的原料。

LVDT, SEE - LINEAR VARIABLE DIFFERENTIAL             線性可變差動變壓器，

TRANSFORMER                                              見 Linear Variable Differential Transformer．

M

MAC, SEE - MEAN AERODYNAMIC CHORD                    平均氣動弦，

                                                         見 Mean Aerodynamic Chord．

MACH NUMBER, The ratio of the aircraft's true        馬赫數，

airspeed to the speed of sound at that point.            飛機真空速與該處音速之比。