Definition
A radio frequency in the VHF aviation band assigned for communication between pilots and Flight Service Stations (FSS), commonly used by en route aircraft to obtain inflight weather, file or amend flight plans, and receive Enroute Flight Advisory Service (Flight Watch) on selected outlets.
Plain English
A specific radio channel pilots tune to in order to talk with a Flight Service Station while flying, usually for weather updates or flight plan changes.
Context Anchor
Seen on aircraft communication radios, in radio examples, and in training figures that show a pilot selecting or using a specific frequency.
Derivation
Mega- means “million.” Hertz is the unit for frequency, named after Heinrich Hertz, whose work helped prove how radio waves behave. So 122.0 MHz means a radio wave frequency of 122.0 million cycles each second.
Why Pilots Care
Tuning this frequency gives pilots immediate access to weather reports, turbulence updates, and route advisories that support safe in-flight decisions.
Intuition Check
Do not read 122.0 MHz as an altitude, heading, or transponder code. Here it is a radio frequency—the channel selected on the communication radio.
Example Sentence 1
Approaching the front, the pilot tuned 122.0 MHz to request an updated weather briefing from Flight Service.
Example Sentence 2
While flying IFR, the instructor recommended monitoring 122.0 MHz for any pilot reports of icing.