SELCAL, SEE - SELECTIVE CALLING                        选择呼叫，

                                                         见Selective Calling.

SELECTIVE CALLING, A system that automatically         选择呼叫，

alerts the flight crew to a call from the airline ground 一个能自动将航空公司地面站呼叫报知机组的系统。

station.

SELECTOR VALVE, A valve in the hydraulic system for    选择活门，

connecting hydraulic supply to one side of the actuator  液压系统中，用于将液压源一端连接作动简，另一端连

and the other side to the return line.                 接回油端的活门。

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英汉对照民用航空词典                                   BOEING

SELF SEALING COUPLING, A connection between two     自封接头，

fluid filled hoses for preventing fluid loss when the hoses 用以连接两个充满液体的软管的特制接头。在两个管子

are separated.                                      分开时，接头内的弹簧即使活门堵住通道，自动封闭而不

                                                    让液体流出。

SEMI-MONOCOQUE, Type of construction in which the   半硬壳式结构，

skin, stringers and frames carry all the loads.       使蒙皮，长桁和隔框共同承受所有载荷的构造形式。

SENSOR, An electrical device for detecting variable 传感器；

conditions and sending a signal to indicators and lights. 检测变量状况并将结果以信号送至指示器和指示灯的

                                                    电气装置。

SENSOR ACTUATOR, A device for operating the         传感器致动器，

sensor.                                               用以操作传感器的装置。