← All explained questions · Supplemental · III — Airport & Seaplane Base Operations

An airport beacon flashing at night with WHITE-YELLOW alternating identifies the airport as

Choices

a land airport.
Land airports are white-green.
✓ a water/seaplane base.correct
Airport rotating beacon codes (AIM 2-1-9): flashing white and green = lighted land airport; flashing white and yellow = lighted water airport; flashing green, yellow and white = heliport; two quick white flashes alternating with a green flash = military airport. White alternating with yellow therefore identifies a water/seaplane base.
a heliport.
Heliports use white-white or white-green-yellow.
a military airport.
Military beacons are white-white-green.

Why

Airport rotating beacon codes (AIM 2-1-9): flashing white and green = lighted land airport; flashing white and yellow = lighted water airport; flashing green, yellow and white = heliport; two quick white flashes alternating with a green flash = military airport. White alternating with yellow therefore identifies a water/seaplane base.

FAA source: AIM 2-1-9browse the reference library →

Covered in Supplemental · III — Airport & Seaplane Base Operations — study the lessons free, then practice with grading and mastery tracking.

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Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question. Reviewed by a panel of three CFIs + AI review.