What is a significant advantage of using ATC light gun signals?

The significant advantage of using ATC light gun signals lies in their ability to operate without a power source. This aspect is crucial in situations where radio communication may fail, be unreliable, or for aircraft that do not have the capability to receive radio transmissions. Light gun signals are an effective way for air traffic controllers to communicate with pilots visually, especially during emergencies or when the use of radio is not feasible.

The fact that they require no power source makes them reliable and a necessary backup communication method in instances where electronic systems might not be functioning as intended. It emphasizes their utility in ensuring safety and maintaining communication in various scenarios.

Other options suggest aspects that do not align with the primary functions or characteristics of light gun signals. For example, while some light gun signals can convey procedures simply, they do not relay complex information, and their use isn’t limited to large airports or specific times of day. They can be effective in various conditions, including at smaller airports, and they can be used in low visibility situations or at night when necessary, assuming the light gun itself is operational.