What is the emergency frequency used for distress calls?

The emergency frequency used for distress calls is 121.5 MHz. This frequency is designated internationally as the primary emergency frequency for aviation distress communications. It is monitored by air traffic control, aircraft in flight, and many emergency response agencies, making it the standard for pilots to report emergencies or seek assistance.

When a pilot declares an emergency on 121.5 MHz, it allows for immediate communication to seek help, whether due to engine failure, navigation issues, or other emergencies affecting flight safety. Additionally, because it is specifically set aside for emergencies, it has a higher chance of being monitored by other aircraft in the area, further increasing the likelihood of obtaining assistance.

In contrast, other frequencies mentioned do not serve the same purpose. While 123.45 MHz is often used for general aviation communications, it is not specifically an emergency frequency. The frequency 118.0 MHz typically operates within specific air traffic control channels and is not designated for emergencies. Lastly, while 7700 is used for squawking an emergency code in transponders, it does not serve as a frequency for voice communication but rather for indication on radar. Therefore, 121.5 MHz stands out as the correct response for distress communication in aviation.