as ambient pressure.                                  孔、或限流器。

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VENT SCOOP, An air inlet/outlet on the bottom skin of 通氣進氣口，

the wing for fuel tank venting and supplying positive air 位于機翼下表面蒙皮上，用以燃油箱通氣和提供燃油箱

pressure inside the fuel tank.                        內正氣壓的空氣進出口。

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

area for airflow measurement. (Principle: As air velocity 氣源導管上，導管截面變小以量取空氣流量的那一部

increases, pressure decreases).                       份。（原理，導管截面變小時，流速增高，壓力降低。）

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

airplane from top to bottom. Airplane left and right    由飛機上部至底部的垂直軸。用以操縱方向舵，使飛

movement controlled by the rudder.                    機沿此軸作左右運動。

VERTICAL NAVIGATION, Functions which provide          垂直導航，

guidance signals to control the aircraft during climb or 在爬升或下降期間提供引導信號以控制飛機的功能。

descent.

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

                                                        飛行高度改變的速率。

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

empennage for stability/control about the vertical axis. 在飛機尾部，用以保持飛機繞垂直軸的穩定性和控制