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| 正常操作区 (延伸到仪表着陆系统航向信标航线或微波着陆系统进近航线任一侧的尺寸一定的空域。在独立的平行进近中，只使用正常操作区的一半) | |||
| English thesaurus | |||
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| An airspace of defined dimensions, extending to either side of an instrument landing system ILS localizer centreline. Only the inner half of the normal operating zone is taken into account in independent approaches. | |||
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