Plain English Meaning

Bright flashing lights on the aircraft that make it easy to see, helping other pilots and people on the ground spot it and avoid getting too close.

Full Definition

A system of high-intensity flashing or rotating lights on an aircraft, typically including a red rotating beacon and white strobe lights, designed to make the aircraft conspicuous to other pilots and ground personnel. Required by regulation for most aircraft operations, the anticollision light system must be operating any time the aircraft is in flight, and on the ground when the engine is running, except when the pilot determines the lights would create a safety hazard.

Context Anchor

Seen in aircraft electrical system discussions, exterior light checks, and before-start or .