| 单词 |
fan marker |
| 释义 |
fan marker
fan marker[′fan ‚märk·ər] (navigation) fan-marker beacon fan marker A highly directional radio signal transmitted vertically upward from a transmitter located along a navigational radio-range, as in an instrument landing system (ILS). The output of a fan marker is heard only when the aircraft is directly above the transmitter, thus indicating to the pilot his exact position. A fan marker is keyed for identification. Also called a fan-marker beacon.AcronymsSeeFM |
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