The VHF universal simplex channel for emergency and distress communication is which frequency?

• A. 121.5 MHz
• B. 118.0 MHz
• C. 123.4 MHz
• D. 126.0 MHz

Answer: (A)

The main idea is understanding the universal emergency channel used in aviation communications. The distress and emergency calls use a single global VHF frequency, which is 121.5 MHz, and it is a simplex channel, so you transmit and receive on the same frequency without a repeater. This channel is monitored by many ground stations and search-and-rescue services, so a MAYDAY call heard on 121.5 helps authorities locate and assist aircraft in trouble. Other frequencies are used for routine contact with air traffic control and other services, not for emergency distress calls. So, 121.5 MHz is the universal emergency and distress channel.