Aerial Marker Balls Utilized on Power Lines to Enhance Aviation Safety
Giant orange spheres, known as aerial marker balls, are strategically placed on power lines to make nearly invisible wires visible to low-flying aircraft. These markers are crucial in areas where planes and helicopters operate at lower altitudes, such as near airports, heliports, mountain passes, rivers, and deep valleys. The spheres, typically made of UV-stable plastic or fiberglass, come in sizes ranging from 20 to 36 inches across and weigh between 10 and 25 pounds. They are usually spaced about 200 feet apart along the tallest wire, with closer spacing near runways. The Federal Aviation Administration (FAA) mandates their use as unlit markers for daytime visibility, with approved colors being aviation orange, white, and yellow. Installation involves ground crews pre-assembling hardware and helicopters deploying linemen to secure the clamshell-like markers onto the conductors.
