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| blind approach landing system | |||
| instrument landing system (为飞机着陆导航的无线电辅助设施。它提供了到最佳着陆点的横向和垂直导引。仪表着陆系统包括航向信标，指引飞机到跑道中心线; 下滑发射机,指引飞机沿着要求的下滑路线下降; 外指点标和内指点标，飞机在其上经过时为飞机提供指示；以及灯光系统) | |||
| instrument landing system | |||
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仪表着陆系统 : 55 phrases in 4 subjects |
| Aviation | 33 |
| Electronics | 12 |
| General | 1 |
| Space | 9 |
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