← All explained questions · Airports, Runways, Signs, Markings and Lighting
A PAPI shows three white lights and one red light. What does this indicate?
Choices
On the glide path
On path is two red and two white.
✓ Slightly highcorrect
More white than red means above the path; three white and one red is slightly high.
Slightly low
More red than white would indicate low, not high.
Well below the path
Four red would indicate well below the path.
Why
A PAPI shows two red and two white when on path. More white than red means high, so three white and one red is slightly high; more red than white means low.
FAA source: AIM 2-1-2browse the reference library →
This is taught in Beacons, Lighting and Glideslope Aids — study the lessons free, then practice with grading and mastery tracking.
Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.