SERVO, An automatic control system which checks its 伺服系统，

output against its input so as to achieve a desired   能检查输出和输人数据，以便合适调控的自动控制系

control.                                            统。

SERVO ARMED, Hydraulic pressure for the servo is    伺服预位，

present to allow the servo to internally synchronize to 液压使伺服系统内部同步至适当的位置，但伺服系统的

the proper position, but the mechanical output of the 机械输出还没有接通。

servo is not connected.

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英汉对照民用航空词典                                  BOEING

SERVO ENGAGED, The mechanical output of the        伺服系统预位，

servo is connected and the servo can move a surface or 伺服系统的机械输出与伺服系统已接通，伺服系统可移

control                                            动一个平面或操纵。

SET SCREW, A small screw (usually headless) used to 定位螺丝钉，

fasten a pulley, wheel, or knob onto a shaft and prevent 小螺丝钉（一般是没有钉头的）用于将滑轮，车轮，或

rotation.                                          旋钮紧固在轴轮上被免转动。

SG, SEE - SYMBOL GENERATOR                         符号发生器，

                                                    见Symbol Generator．

SHEAR, The stress exerted on a material or, assembly 剪切力，

which tends to slide the mating surfaces parallel to each 加在材料或组件上的应力。该力往往导致互相平行的成

other.                                             对表面滑动。

SHIMMY, Rapid oscillations (left-right) of the landing 摆振，

gear wheels.                                        起落架轮子的快速的左右摆动。