Light Gun Signals
Learn aviation light gun signal meanings for aircraft on the ground and in flight, including steady and flashing green, red, white, and alternating signals.
Introduction to Light Gun Signals
- Light gun signals are a tool used by Air Traffic Control Towers (ATCT) when:
- No radio is equipped on the aircraft
- Communications cannot be established, or
- During communication malfunctions
- Applies not only to aircraft, but to ground vehicles, equipment, and personnel not equipped with radios
- ATC personnel use a directive traffic control signal which emits an intense narrow light beam of a selected color (either red, white, or green) when controlling traffic by light signals
- Test your understanding of Light Gun Signals by completing the knowledge quiz, applying your knowledge in the interactive scenario, comparing your performance against the applicable Airman Certification Standards, and concluding with the topic summary to reinforce the key concepts before moving on to the next lesson.
Light Gun Signals Key Highlights
- Light gun signals allow air traffic control towers to communicate with aircraft experiencing radio communication failures.
- Controllers use colored light signals to provide movement instructions to aircraft operating on the ground or in flight.
- Steady green signals authorize takeoff clearance on the ground and landing clearance for aircraft in flight.
- Flashing green signals clear aircraft on the ground to taxi and instruct aircraft in flight to return for landing, to be followed by a steady green signal at the proper time.
- Steady red signals instruct aircraft to stop on the ground or give way to other aircraft and continue circling while airborne.
- Flashing red signals direct aircraft on the ground to taxi clear of the runway in use and aircraft in flight not to land because the airport is unsafe.
- Flashing white signals instruct aircraft on the ground to return to the starting point on the airport.
- Alternating red and green signals indicate pilots should exercise extreme caution during operations.
- During daylight, acknowledge light gun signals by rocking the wings in flight or moving the ailerons or rudder on the ground; at night, blink the landing or navigation lights.
- Understanding light gun signals improves emergency preparedness, communication capability, and overall flight safety.
Light Gun Procedures
- If radio communication fails before entry into Class B, Class C, or Class D surface airspace, remain outside unless ATC has authorized entry by another method, an established no-radio procedure applies, or an emergency requires different action.
- If the failure occurs after entry or while in the traffic pattern, maintain aircraft control, remain predictable, continue to see and avoid other traffic, attempt appropriate alternate communication, and watch the tower for light signals. An appropriate tower clearance is still required before landing unless an emergency requires the pilot in command to exercise emergency authority.
- If radio malfunction occurs after departing the parking area, watch the tower for light signals and monitor the tower frequency if reception remains possible.
-
Day Light Gun Procedures:
- During daylight, acknowledge tower transmissions or light signals by moving the ailerons or rudder while on the ground or rocking the wings while in flight
-
Night Light Gun Procedures:
- At night, acknowledge tower transmissions or light signals by blinking the landing or navigation lights
- Between sunset and sunrise, a pilot on the ground who needs to attract the tower's attention should turn on the landing light and taxi to a position clear of the active runway where the light is visible to the tower.
- Keep the landing light on until the appropriate tower signals are received
Light Gun Signal Notes and Limitations
- A steady green light directed to an aircraft in flight means cleared to land.
- Light gun signals have important limitations:
- Pilots may not be looking toward the control tower when a signal is directed at their aircraft.
- Signals may be difficult to see during daylight.
- Light gun signals communicate only limited instructions and cannot provide an explanation or additional information.
- Alternating red and green is the general warning signal and means "exercise extreme caution."
- If an electrical failure caused the communication loss, the aircraft's exterior lights may also be unavailable, making it more difficult for the controller to locate the aircraft.
Light Gun Signals Simulator
Choose a signal, then switch between aircraft on the ground and in flight to explore its meaning.
Image for demonstration purposes only
Steady green · Aircraft on the ground
Cleared for takeoff.
Signal brightness and flash timing are illustrative. Use the signal name as well as its color and pattern.
Compare all six signals
| Signal | On the ground | In flight |
|---|---|---|
| Steady green | Cleared for takeoff. | Cleared to land. |
| Flashing green | Cleared for taxi. | Return for landing (to be followed by steady green at the proper time). |
| Steady red | Stop. | Give way to other aircraft and continue circling. |
| Flashing red | Taxi clear of the runway in use. | Airport unsafe, do not land. |
| Flashing white | Return to starting point on airport. | Not applicable to aircraft in flight. |
| Alternating red and green | Exercise extreme caution. | Exercise extreme caution. |
Source: FAA Aeronautical Information Manual, 4–3–13: Traffic Control Light Signals.
Light Gun Signals Interactive Scenario
Interactive Scenario
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Light Gun Signals Knowledge Check
Choose the knowledge check that matches your current training for Light Gun Signals.
Private Pilot
PPL knowledge check
Core Knowledge Review
Review foundational knowledge, key concepts, and practical considerations. Topic: Light Gun Signals.
- Immediate feedback
- Answer explanations
- Account progress tracking
Commercial Pilot
CPL knowledge check
Advanced Application
Apply knowledge to advanced operations, risk management, and aeronautical decision-making. Topic: Light Gun Signals.
- Immediate feedback
- Answer explanations
- Account progress tracking
Why Take a Quiz?
Quizzes reinforce key concepts, identify knowledge gaps, and build confidence for real-world decisions. Quiz material is representative of the information provided here and is not based on or sourced from the Federal Aviation Administration test bank.
Light Gun Signals Conclusion
- Although the traffic signal light offers the advantage that some control may be exercised over nonradio equipped aircraft, pilots should be cognizant of the disadvantages
- Still looking for something? Continue searching:
Light Gun Signals References
- Federal Aviation Administration (FAA) - Pilot/Controller Glossary.
- Aeronautical Information Manual (4-3-13) Traffic Control Light Signals.
- CFI Notebook.net - Air Traffic Control Tower (ATCT).
- CFI Notebook.net - Emergency Voice Reports.
- Federal Aviation Regulations (91.125) ATC light signals.
- Professional Helicopter Pilots Association