----------------------- Page 18-----------------------

英汉对照民用航空词典                                      BOEING

BALANCED FIELD LENGTH, The field length                平衡场长，

associated with optimum aircraft performance when        当障碍物非限制因素使飞机达到最佳性能的场长。在此

obstacles are not a constraint. In this case, after engine 情况下，V1时发动机故障，要完成加速、起飞、离地35

failure at V1, the distance required to accelerate, takeoff 英尺所需距离等于相同速度下完成全停所需的距离。

and reach a height of 35 feet is equal to the distance

required to stop from the same speed.

BALLAST, A weight installed in an aircraft to maintain 压舱物，

the center of gravity within allowable limits.           为保持飞机重心在许可范围内面装载的配重物。

BALL NUT, A fixed spherical nut driven by the          球形螺母，

jackscrew for flap and stabilizer movement.              由粗重螺杆驱动的固定的球形螺母，用以使襟翼和水平

                                                       安定面运动。

BAR OUT OF VIEW, A signal used to remove the flight    指引杆消失，

director command bar(s).                                 用于除去飞行指引杆的信号。

BAROMETRIC PRESSURE, The pressure of air above         气压，

zero pressure measured in inches of mercury (in Hg) or   零压力以上的空气压力。通常以多少寸高水银柱（in

in millibars (MB).                                     Hg）或毫巴（MB）来表示。

BASE METAL, The underlining metal to which alloying    基底金属，

agents or metals are added.                              指合金中的主要金属成份。

BATTERY, An electrical device for changing stored      电瓶，

chemical energy into direct electric current.            将储蓄的化学能转变为直流电的电气装置。

                                      TECHNICAL DICTIONARY                                   17

----------------------- Page 19-----------------------