What frequency is designated as the emergency frequency for aviation communication?

The emergency frequency designated for aviation communication is 121.5 MHz. This frequency is internationally recognized and serves as a distress frequency for pilots and air traffic control when an aircraft is in need of assistance or when there is an emergency situation.

Aircraft are required to monitor 121.5 MHz when operating in flight, particularly during times of distress, and air traffic controllers are also expected to be vigilant on this frequency for emergency communications. Its global recognition ensures that pilots can receive help from nearby aircraft or ground stations, regardless of where in the world they are flying. Other frequencies listed in the options are typically used for different communications but do not serve this specific purpose.