as ambient pressure.                                  孔、或限流器。

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VENT SCOOP, An air inlet/outlet on the bottom skin of 通气进气口，

the wing for fuel tank venting and supplying positive air 位于机翼下表面蒙皮上，用以燃油箱通气和提供燃油箱

pressure inside the fuel tank.                        内正气压的空气进出口。

VENTURI, A part of pneumatic duct with reduced flow   文氏管，

area for airflow measurement. (Principle: As air velocity 气源导管上，导管截面变小以量取空气流量的那一部

increases, pressure decreases).                       份。（原理，导管截面变小时，流速增高，压力降低。）

VERTICAL AXIS, A vertical axis passing through the    垂直轴，

airplane from top to bottom. Airplane left and right    由飞机上部至底部的垂直轴。用以操纵方向舵，使飞

movement controlled by the rudder.                    机沿此轴作左右运动。

VERTICAL NAVIGATION, Functions which provide          垂直导航，

guidance signals to control the aircraft during climb or 在爬升或下降期间提供引导信号以控制飞机的功能。

descent.

VERTICAL SPEED, The rate of change of altitude.       垂直速度，

                                                        飞行高度改变的速率。

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VERTICAL STABILIZER, A vertical surface of the      垂直安定面，

empennage for stability/control about the vertical axis. 在飞机尾部，用以保持飞机绕垂直轴的稳定性和控制