题目内容
词汇与结构The localizer provides for ILS facility ____ by periodically transmitting a 1020 Hz morse code identification signal.
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词汇与结构Modern localizer antennas are highly directional. However, usage of older, less directional antennas allows a runway to have a ____ approach called a localizer back course.
词汇与结构The glideslope____no identification signal, so ILS equipment relies on the localizer for identification.
词汇与结构Localizer back course signal is reverse sensing so a pilot may have to fly ____ the needle indication.
词汇与结构If neither can be seen, the approach must be ____ and a missed approach procedure will be performed.
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