A

ABEAM (ABM), Beside: An aircraft is abeam a station when that station is 90° to the right or left of the track of

the aircraft. 
正切，当电台在飞机左侧或右侧方与航迹成90 度时，飞机正切电台。                                      

ABSOLUTE ALTITUDE, The actual distance the aircraft is above the ground.
绝对高度，飞机离地面的实际距离。

ABSOLUTE PRESSURE, Pressure of a liquid or gas measured relative to a vacuum.
绝对压力，相对于真空（无压力）测得的液体或气体的压力。

ACARS, SEE - AIRCRAFT (OR ARINC) REPORTING ADDRESSING AND COMMUNICATION SYSTEM
飞机通信寻址和报告系统，见Aircraft （or ARINC）Reporting Addressing and Communication System．

ACCELERATION, The rate of change in velocity with respect to time.   

加速度，随时间变化的速度改变率。

ACCESSORY GEARBOX, A part of the engine, mechanically driven by a compressor or an angle gearbox, for driving components necessary for engine and airplane operations.
附件齿轮箱，发动机的一部份，由压气机或伞齿轮箱带动，用来驱动一些使发动机和飞机工作的部件

ACCUMULATOR (NO. 1), A container with hydraulic          蓄压器（NO．1），

fluid pressurized by dry air or nitrogen for operation of  含有靠干燥空气或氮气增压的液压油的容器。当没有正

components when normal hydraulic supply is not           常的液压源可用时，该容器可用以驱动部件。

available.

ACCUMULATOR (NO. 2), In a computer, a special            存储器（NO．2），

storage register associated with the arithmetic logic unit, 计算机中，一种与算术逻辑组件有关系的特别存储寄存

used for holding the results of a computation or data    器，用来存放运算结果或数据传输。

transfer.

ACMS, SEE - AIRCRAFT CONDITION MONITORING                飞机状态监控系统，

SYSTEM                                                     见Aircraft Condition Monitoring System．

ACTUATOR, A mechanical device operated electrically,     作动筒，

hydraulically, pneumatically or mechanically for           由电，液压，气源或机械驱动的机械装置，用于传送部

transmitting motion between components.                  件之间的运动。

ADC, SEE - AIR DATA COMPUTER                             大气数据计算机，

                                                           见Air Data Computer．

ADF, SEE - AUTOMATIC DIRECTION FINDER                    自动定向仪，