There must be wind direction indicators for the flight crew to be able to get wind information during approach and take-off.
If the airport is to be used after dark there should be at least one wind direction indicator illuminated, if there is no air traffic control
service or if air traffic control is not on duty. Smaller wind direction indicators must always be installed on runways exceeding 1,200 meters.
The mast of the Wind Direction Indicator is made of aluminum alloy and the fabric of the wind sock is made of lightweight, waterproof
textile that is flexible and has a long life span.
Meets all the requirements of wind direction indicators according to ICAO.