3-2-1 Light Signals

 Use air traffic control light signals from Table 3-2-1 to control aircraft and the movement of vehicles, equipment, and personnel on the movement area when radio communications cannot be employed.

Table 3-2-1 - ATC Light Signals
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   Key:
      Color and type of signal
         Meaning: Aircraft on the ground
         Meaning: Aircraft in flight
         Meaning: Movement of vehicles, equipment, and personnel
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   Steady green
      Cleared for takeoff
      Cleared to land
      Cleared to cross; proceed; go
   Flashing green
      Cleared to taxi
      Return for landing (to be followed by steady green at the proper time)
      Not applicable
   Steady red
      Stop
      Give way to other aircraft and continue circling
      Stop
   Flashing red
      Taxi clear of landing area or runway in use
      Airport unsafe - Do not land
      Clear the taxiway/runway
   Flashing white
      Return to starting point on airport
      Not applicable
      Return to starting point on airport
   Alternating red and green:
      General Warning Signal - Exercise Extreme Caution
      General Warning Signal - Exercise Extreme Caution
      General Warning Signal - Exercise Extreme Caution
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REFERENCE -
FAAO 7110.65, Altitude Restricted Low Approach, paragraph 3-10-10.
FAAO 7210.3, Letters of Agreement, paragraph 4-3-1.

3-2-2 Warning Signal

 Direct a general warning signal, alternating red and green, to aircraft or vehicle operators, as appropriate, when:
NOTE -
The warning signal is not a prohibitive signal and can be followed by any other light signal, as circumstances permit.
 a. Aircraft are converging and a collision hazard exists.
 b. Mechanical trouble exists of which the pilot might not be aware.
 c. Other hazardous conditions are present which call for intensified pilot or operator alertness. These conditions may include obstructions, soft field, ice on the runway, etc.

3-2-3 Receiver Only Acknowledgment

 To obtain acknowledgment from an aircraft equipped with receiver only, request the aircraft to do the following:
 a. Fixed wing aircraft -
  1. Between sunrise and sunset -
   (a) Move ailerons or rudders while on the ground.
   (b) Rock wings while in flight.
  2. Between sunset and sunrise - Flash navigation or landing lights.
 b. Helicopters -
  1. Between sunrise and sunset -
   (a) While hovering, either turn the helicopter toward the controlling facility and flash the landing light or rock the tip path plane.
   (b) While in flight, either flash the landing light or rock the tip path plane.
  2. Between sunset and sunrise - Flash landing light or search light.