OPERATING ENVELOPE, Defines the environmental        使用包線，

limits of pressure altitude, temperatures and speed    確定飛機準予飛行的壓力高度、溫度和速度的環境極

within which the airplane is certified to operate.   限。

OPTIMUM ALTITUDE, The cruise altitude which results  最佳高度，

in the best fuel mileage.                              可獲得最佳燃油哩程的巡航高度。

OR GATE, A device or circuit with two or more inputs of 或門，

binary information and one output. The output is 1 when 具有兩個或兩個以上二進制信息輸人，和一個輸出的裝

any one or more of the inputs is 1. The output is 0 when 置或電路。當輸人端有一個或多個為邏輯1時，輸出為邏

all of the inputs are 0.                             輯1；當輸人端都為邏輯0時，輸出為邏輯0。

ORIFICE, A specified size hole in component for control 量孔，

of fluid flow from or to the component.                部件上用來控制流往或流出該部件的液流的尺寸已確

                                                     定的孔。

ORONASAL MASK, An oxygen mask covering only the      口鼻罩，

mouth and nose.                                        僅罩住嘴和鼻子的氧氣罩。

OSCILLATE, To swing back and forth with a constant   振蕩，

rhythm.                                                以恒定節律作前后的搖擺。

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英漢對照民用航空詞典                                      BOEING

OUT OF DETENT, A condition away from neutral or a      脫離卡擋，

notched position.                                        操縱桿離開中立或槽口位置的一種狀態。

OUTER LOOP CONTROL, For autopilot operation this       外回路控制，