Aviation Light Gun Signals

Light gun signals allow control towers to communicate with pilots of aircraft and drivers of other vehicles that do not have radios, or that have had a radio failure. They also allow 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 and green	Exercise Extreme Caution	Exercise Extreme Caution	Exercise Extreme Caution

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