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height above touchdown
avia. 离接地点高度; 着陆点上空高度 (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))
 English thesaurus
height above touchdown
avia., Canada The height in feet of the decision height DH or minimum descent altitude MDA above the touchdown zone elevation (TDZE)
Height Above Touchdown
abbr., scottish HAT