Online Ground School (Private Pilot)
Lesson: Airport Lighting (Airport Beacons)
Reference: ACS PA.III.A.K1 - K9, PA.III.B.K1 - K4 PHAK Chapter 14
Beacon lights are used to help identify an airport and the type of airport at night.
The beacons are operated from dusk until dawn, but may also be operated during the day if the weather is below VFR minimums.