O

O-RING, A circular shaped rubber or synthetic material O形圈，

sealing device for pneumatic and hydraulic systems.   用于氣源和液壓系統(tǒng)，圓形的橡膠或合成材料制成的密

                                                    封裝置。

OAT, SEE - OUTSIDE AIR TEMPERATURE                  外界大氣溫度，

                                                        見Outside Air Temperature．

OBSTACLE, An obstruction protruding into the airspace 障礙物，

in the path of flight.                                進(jìn)人飛行航徑上空域里的障礙物。

OBSTACLE CLEARANCE, The process of flying the       越障，

aircraft over all obstructions under the flight path. 飛機飛越其航道上所有障礙物的飛行過程。障礙物的選

Which obstructions are considered and the amount of 擇和飛機距離障礙物的高度要求由當(dāng)?shù)赜嘘P(guān)管理機構(gòu)決

vertical altitude required above the obstructions are 定。

determined by local regulatory agency.

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英漢對照民用航空詞典                                 BOEING

OEW, SEE - OPERATING EMPTY WEIGHT                 使用空重，

                                                    見Operating Empty Weight．

OFFSIDE, Opposite side.                           反面，

                                                    相反的一面。

OIL COOLER, A heat exchanger for cooling engine oil 滑油冷卻器，

by fuel flow or airflow.                            利用燃油或空氣的流動來冷卻發(fā)動機滑油的熱交換器。