What are light gun signals used for?

• A. Light Gun signals are used when radio communications have failed between ATC and an airfield driver
• B. Light Gun signals are used to request fuel
• C. Light Gun signals are used to direct ground crew
• D. Light Gun signals are used only during daylight hours

Answer: (A)

Light gun signals provide a backup method for directing airfield movements when radio communications between ATC and a surface vehicle are broken. A controller uses a portable light signal to convey instructions to pilots and ground drivers, telling them to stop, proceed, or taxi in specific directions until normal radio contact is restored. This capability is usable at any time, day or night, and is essential for safe operations when radios aren’t working. It’s not about requesting fuel, and its purpose isn’t limited to directing ground crews; it’s a general signaling method to maintain surface control during communication outages.