This can be a useful function when landing at night in combat at an airfield without an ILS glide slope.

这个方法会非常有用尤其在夜间降落而没有ILS滑翔轨迹指导时。

ILS guidance indication is changed to 2 circles that must be inside each other to be on the glide slope and localizer.

着陆导航系统引导指示改成2个圆圈，它们必须重合才满足下滑道和方向定位的要求。

Nine seconds later, the warning changed to a current alert, indicating the track had passed below the glide slope altitude.

九秒钟之后，警告转变成连续不断的警报，指示航迹已经低于下滑道高度。

Chances are the pilot was not getting dependable glide slope data.

飞行员错过了设定可靠的下滑道数据的大好机会.