when the switch is activated. Color codes and the meaning of each signal shall be attached to the back
of the light gun.
Because of the infinite variety of possible emergency situations, specific procedures cannot be
prescribed. When you believe an emergency exists or is imminent, select and pursue a course of action
that appears most proper under the circumstances. Before selecting a course of action, however, always
get enough information to handle the emergency intelligently. Base your decision as to the type of help
needed on information and requests received from the aviator, then provide maximum assistance.
CONTROLLING AIRBORNE AIRCRAFT
The proper light gun signals for controlling airborne aircraft are a steady green, flashing green,
steady red, or flashing red. A steady green means cleared to land. A flashing green followed by a
steady green light at the proper time means return for landing. A steady red means give way to other
aircraft and continue circling. A flashing red means the airport is unsafe, do not land. The aviator at
night should acknowledge the above signals by flashing landing lights. During daylight hours,
acknowledge by rocking the wings while in flight.
NOTE: Flashing white is not used for controlling airborne aircraft. There are so many flashing white
lights on the ground that it would be hard to distinguish one from the other.
CONTROLLING AIRCRAFT ON THE GROUND
The proper light gun signals for controlling aircraft on the ground are a steady green, flashing
green, steady red, flashing red, and flashing white. A steady green means cleared for takeoff. A
flashing green means cleared to taxi. A steady red means stop. A flashing red means taxi clear of the
landing area or runway in use. A flashing white means return to the starting point at the airport. The
pilot should acknowledge these signals by moving ailerons or rudders. (A helicopter aviator might
either turn the helicopter toward the controlling facility and flash his landing lights or rock the tip path
CONTROLLING VEHICLES, EQUIPMENT, AND PERSONNEL
The proper light gun signals for controlling vehicles, equipment, and personnel on the ground are
a steady green, steady red, flashing red, and flashing white. A steady green means cleared to cross, go,
or proceed. A steady red means stop. A flashing red means clear the runway or taxiway. A flashing
white means return to the starting point at the airport.