ATC AP Characteristics Practice Test

On a PAPI, a configuration of two red and two white means you are:

Not on the glide path On the glide path Too high Off the approach

Correct Answer:

On the glide path

Explanation:

PAPI uses four lights to give a vertical position readout relative to the glide slope. Each light can be red or white, and the pattern tells you where you are relative to the ideal descent path. When you see two red and two white, that specific mix means you’re on the published glide path. The general rule is that more white lights indicate you’re above the glide path and need to descend toward it, while more red lights indicate you’re below the glide path and need to decrease descent or adjust to get back on track. Extreme all-white or all-red patterns would indicate you’re well above or well below the glide path, respectively.

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