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| 简易精确进近下滑道指示器; 简易精确进近下滑道指示器 仅由位于跑道左侧的两组灯光单元构成。如距跑道较近的灯光单元显示红色，较远的灯光单元显示白色,表示飞机处于下滑道中。如两组灯光单元均显示白色，表示飞行高度过高，两组灯光单元均显示红色,表示飞行高度过低。APAPI 系统始终将轮视角高度 (EWH )设为 10ft (3m) APU auxiliary power unit 辅助动力装置 (为液压系统、空调系统、电力系统和航空电子系统提供动力的装置。它可以提供交流电 (AC)和直流电 (DC)。 APU 主要是在飞机起飞前使用或是地面测试时使用。在极少的情况下,APU 还可以在紧急情况下提供推力。地面辅助动力装置在发动机起动时可提供电力) | |||
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| A visual glide slope indicator VGSI consisting of only two light units normally situated on the left side of the runway in the form of a wing bar and indicating that the aircraft is on slope if the unit nearest the runway shows red and the unit furthest from the runway shows white, too high if both units show white, and too low if both units show red | |||
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