FAA: L807 AC 150/5345-27 (Current Edition)
ICAO: Annex 14, Vol. 1, para. 5.1.1 (Size 2 only)
The Hali-Brite L-807 Wind Cone provides a visual indication of wind direction and velocity. FAA Size 2 wind cones are used at the central location on an airfield. FAA Size 1 wind cones are used at small airfields and heliports and as a supplemental indicator at large airfields.