guard frequency

guard frequency

An emergency VHF/UHF (very high frequency/ultrahigh frequency) channel monitored as a secondary frequency by all air and ground stations in a geographical area. The guard frequencies 121.5, 243 and 406 MHz are reserved around the world and are known as international aeronautical emergency frequencies. They should not be used for normal voice messages or general conversation.
Mentioned in ?
References in periodicals archive ?
We could communicate with the ship over guard frequency, and at roughly 20 miles out, we received the ship's TACAN signal.
The local controller immediately saw the problem and got on the guard frequency (a frequency that can be heard by all aircraft no matter what other frequency they're on) and told Pacer 19 to hold short of the runway Pacer 19 was able to stop as the F-15s continued their takeoffs.
All vessels longer than 66 feet, tugs or towing vessels longer than 26 feet, passenger vessels more than 100 gross tons and most dredges must be equipped with radios that can operate on the Coast Guard frequency, VHF-FM channel 22A.
As we climbed higher, we picked up an E-2C on guard frequency.
The pilot of the airattack aircraft tried to contact the pilot of the Navy aircraft on VHF guard frequency (121.
I asked the HAC to raise the landing gear and to get out a Mayday call on guard frequency.
My COTAC, bless him, had pulled out his PRC-90 and had tried to talk on guard frequency.
As I switched off of guard frequency back to Washington Center, the controller frantically called for me to contact the next ATC sector.