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| helicopter approach path indicator (类似于用在固定翼飞机上的目视进近下滑道指示器 (VASI)。当直升机正好处于所要求的下滑道时,就会显示稳定的绿色信号；当直升机在下滑道上方时,显示闪烁的绿色信号; 而稍低于下滑道时,就得到稳定的红色信号; 低于下滑道较多时，显示闪烁的红色信号) | |||
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