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On a two-bar VASI, what does "red over red" indicate?
Choices
The airplane is on the glide path
Red over white indicates on the glide path.
The airplane is too high
White over white indicates too high.
✓ The airplane is too lowcorrect
Red over red means the airplane is below the glide path — "red over red, you are dead."
The VASI is inoperative
Red over red is a valid too-low indication, not a failure signal.
Why
On a VASI, red over red means too low, white over white means too high, and red over white means on the glide path.
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.