CONSPICUITY OF TALL RADIO AND TELEVISION TOWERS IN MARGINAL VISUAL FLIGHT RULES WEATHER.

A comprehensive study was made of marking and lighting of tall radio and television antenna towers so as to be easily detectable by aircraft pilots flying in marginal Visual Flight Rules weather during the daytime. The research used a variety of methods including controlled flight observations and routine flight sightings of ex perimentally marked and lighted towers, reports of pilot experience with such towers, and scale model tests of marking patterns. These studies are reported in detail, and recommendations are made for tower marking and lighting standards based on the findings and pertinennical literature. The recommendations include require ments for at least three white lights of 100,000 to 200,000 candles flashing synchronously at 80 90 fpm. Marking should be with black and white bands 100 feet wide. Guy wire beacons and ground markings are considered to be optional features. Author