To ensure accurate sizing, set printer Page Scaling option to None or 100. US Patent 2,085,020 Combination Sight and Indicator for Traffic Control Projectors. ATC Light Gun Signals For use in chart or flight planning ring binders, cut along dashed lines and punch holes as needed in margins.
^ a b Federal Aviation Administration (July 5, 1973). ATC Light Signals Air Traffic Control (ATC) will use a powerful Light Gun to Signal the Pilot in the event of Radio Communications failure or other emergency when the pilot does not have a working Radio in the aircraft.Give way to other aircraft and continue circling Clearances to land and taxi will follow.) ICAO – Land at this airport and proceed to apron (this is not a clearance to either land or taxi. The use of handheld combination red/green/white signal lamps for air traffic control dates back to at least the 1930s. The table below describes the meaning of the signals. Air traffic control signal light guns are typically specified with a (white) center beam brightness of > 180,000 - 200,000 candela, and are visible for roughly 4 miles in clear daylight conditions. Planes can acknowledge the instruction by rocking their wings, moving the ailerons if on the ground, or by flashing their landing or navigation lights during hours of darkness. These colors may be flashed or steady, and have different meanings to aircraft in flight or on the ground. Flashing red, Taxi clear of runway in use, Airport unsafe - do. The signal lamp has a focused bright beam and is capable of emitting three different colours: red, white and green. Steady red, Stop, Give way to other aircraft and continue circling. ICAO regulations require air traffic control towers to possess such signal lamps.
In the case of a radio failure or aircraft not equipped with a radio, or in the case of a deaf pilot, air traffic control may use a signal lamp (called a "signal light gun" or "light gun" by the FAA ) to direct the aircraft. Air traffic control signal light gun in use at base flight tower
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