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着陆点上空高度
avia.
height above touchdown
(在接地区 (即跑道的最初3000ft)最高跑道标高之上的决断高度或最低下降高度。HAT 与所有飞机直线进近最低气象条件一起公布在仪表进近航图中。又称 height above touchdown zone (接地区上空高度)或 height above the touchdown zone elevation (接地区高程以上的高度))
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