Which signal is typically used to declare a situation where safety is at risk but does not necessitate immediate action?

The signal “PAN PAN, PAN PAN, PAN PAN” is used to indicate an urgent situation that requires assistance but does not pose an immediate threat to life or safety. This signal communicates to other aircraft and ground stations that the situation is serious, though it does not require immediate action as would be the case with a distress call.

In contrast, "MAYDAY, MAYDAY, MAYDAY" signifies a life-threatening emergency that requires immediate help, whereas "SOS, SOS, SOS" is traditionally recognized as an emergency distress signal. The repeated use of "HELP, HELP, HELP" typically indicates an urgent request for help but isn't standardized like the other signals mentioned. Therefore, "PAN PAN" is the correct terminology for situations where safety is at risk, yet there is time to manage the issue without immediate panic or urgent action.