時間：2011-03-11 23:18來源：藍天飛行翻譯 作者：航空 點擊：次
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OMNI (electronic navigation system). A term used for the VOR, Very-high-frequency Omni-Range, navigation system. See VOR. omni bearing selector (electronic navigation instrument). A component in the VOR system on which the pilot selects the radial from the VOR station along which he wishes to fly. The omni bearing selector (OBS) shifts the phase of the reference signal inside the instrument, so the needle on the course deviation indicator (CDI) will center when the aircraft is on the selected radial. omnidirectional antenna (radio antenna). A type of radio antenna that has the same field strength in all horizontal directions. An omnidirectional antenna is also called a nondirectional antenna. omnidirectional microphone. A microphone that picks up sounds equally well from all directions around it. An omnidirectional microphone is also called a nondirectional microphone. on-condition maintenance (aircraft maintenance). A type of aircraft maintenance in which parts are replaced only when their condition is such that they appear to be no longer airworthy. On-condition maintenance differs from life-limited maintenance, in which a part is replaced at the end of a specified number of operational hours or operational cycles, regardless of its apparent condition. on-course indication (air traffic control). An indication on an instrument which provides the pilot a visual means of determining that the aircraft is located on the center line of a given navigational track, or an indication on a radarscope that an aircraft is on a given track. one-hundred-and-eighty-degree ambiguity (navigation system error). An error inherent in some types of radio direction finding equipment in which the equipment cannot distinguish whether the signal being received is ahead of the aircraft or behind it. Automatic direction finding (ADF) equipment solves this problem by using a sense antenna. one-hundred-hour inspection (aircraft maintenance inspection). An inspection required by 14 CFR |
