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TECHNICAL ANNEXES: ANNEX A   109
(b) Shapes. Shapes shall be employed to indicate wind direction, landing and take-off directions, and meteorological information. Shapes employed for different purposes shall be distinctive, one from another, but all shall be conspicuous and legible from a height of at least 1,000 feet (300 meters). Location of shapes used for the same purpose on or near landing areas shall be as uniform as is consistent with proper landing area design. 
(1) Boundary Markers. Suitable markers shall be installed to delineate the boundary of the usable landing area to aircraft in the air and to aircraft on the ground. 
(2) Circle Markers. A circle marker, clearly visible from the air, may be placed on the landing area to aid in identifying the landing area.
(3) Wind Direction Indicators. The direction of the wind at the landing area shall be clearly indicated to aircraft on the ground and in the air by a smoke signal or a free swinging wind direction indicator, of the cone, tee, or tetrahedral type.
(4) Landing Direction Indicators. At landing areas where traffic control is exercised, the desired direction of the landing or take-off shall be clearly indicated to aircraft on the ground and in the air by a landing direction indicator of distinctive appearance so constructed that it will become free swinging in winds in excess of a pre-determined velocity which shall be 20 miles (32 kilometers) per hour or less as operation of the landing area requires.
(c) Flags. Flags shall be of sufficient surface to be clearly visible and legible from a distance of at least 500 feet (150 meters) perpendicular to that surface. Flags marking hazards either temporary or permanent shall be international orange and shall be displayed on the top or along the highest edge of the obstruction. Horizontally extended obstructions shall be marked every 50 feet (15 meters).
8. Luminous Marking Devices. Luminous marking devices include incandescent lamps, gaseous discharge lamps, and gas operated lamps, together with the optics and auxiliary mechanisms to furnish the characteristics stipulated. 
(a) Dangerous Lights. No lights shall be exhibited at or in the neighborhood of a landing area which may endanger the safety of aircraft, whether by reason of glare, or by causing confusion with or preventing clear visual reception of lights or signals prescribed by this subsection. 
(b) Beacons. The positions of a landing area shall be indicated by a luminous beacon located on the landing area. The course of an airway may be indicated by luminous beacons. 
(1) Airfields and Lands Airports Open to Public Use. An airfield or land airport open to public use shall be indicated by a beacon showing aviation white and aviation green or by a beacon showing aviation white, together with an auxiliary light showing aviation green. 
(2) Water Airports. A water airport shall be indicated by a beacon showing aviation white and aviation yellow or by a beacon 
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