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Aviation Light Gun Signals
Light guns allow tower controllers to use a beam of light to communicate with pilots of aircraft or drivers of ground vehicles who do not have radios or who have had a radio failure. They also make it possible for pilots who are deaf to land at controlled airports.
Color and Type of Signal
Aircraft on the Ground
Aircraft in Flight
Vehicles, Equipment and Personnel
Steady
green
Cleared for takeoff Cleared to land Cleared to cross, proceed or go
Flashing
green
Cleared for taxi Return for landing, followed by steady green at appropriate time Not applicable
Steady
red
STOP Give way to other aircraft and continue circling STOP
Flashing
red
Taxi clear of the runway in use Airport unsafe, do not land Clear the taxiway or runway
Flashing
white
Return to starting point on the airport Not applicable Return to starting point on the airport
Alternating
red & green
Exercise Extreme Caution Exercise Extreme Caution Exercise Extreme Caution

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Light me up, Scotty!