Ground Evacuation signal?

• A. 3 short rings
• B. 2 long rings
• C. 6 short rings
• D. 1 long sustained ring

Answer: (D)

A ground evacuation on the airfield is signaled by a single long sustained ring. The long, continuous tone stands out clearly over ambient noise and conveys immediate, no-delay action to evacuate to designated safe locations. It’s unambiguous and less likely to be misinterpreted in a high-noise, busy ramp environment.

Patterns consisting of short rings or multiple rings are used for other instructions or alerts and do not convey the same urgent, all-hands directive for evacuation. The sustained ring specifically communicates that everyone must leave their current area and proceed to safety right away.