Definition
A specific VHF radio frequency, 123.6 megahertz, commonly assigned to Flight Service Stations (FSS) for air-to-ground communication, including airport advisories at non-towered fields and en route services. It is one of several published frequencies pilots use to contact Flight Service for weather, flight plans, and traffic information.
Plain English
A radio channel pilots tune to for talking with Flight Service, often used for airport advisories at fields without a control tower.
Context Anchor
Seen on communication radios, charts, airport information, and training diagrams that show which frequency to use.
Derivation
MHz stands for megahertz, meaning one million cycles per second. The number identifies where on the VHF radio band the channel sits, so the radio can be tuned precisely to it.
Why Pilots Care
Tuning the correct frequency keeps communications reliable and prevents missed advisories or delays during instrument operations.
Analogy
It is like tuning a car radio to one exact station. If the number is off, you may hear the wrong station or nothing useful at all.
Intuition Check
Do not treat 123.6 MHz as a general channel name or an approximate setting. It is an exact radio frequency; the decimal matters.
Example Sentence 1
Approaching the non-towered field, the pilot called Flight Service on 123.6 MHz for an airport advisory.
Example Sentence 2
During the instrument approach sequence, the crew switched to 123.6 MHz for local airport advisory services.