Definition
A published list of radio frequencies a pilot can use to contact Flight Service while en route, used for filing or amending flight plans, obtaining weather updates, and receiving advisories. These frequencies are shown on aeronautical charts near the relevant VOR or Flight Service outlet and indicate where two-way radio contact with a Flight Service Station is available during cruise.
Plain English
These are the radio channels you can use to talk to Flight Service while you are flying along, so you can get weather, update your flight plan, or ask for help.
Context Anchor
Seen in chart notes, airport information, and aviation reference material that tells pilots where to get weather, advisories, or other flight information by radio.
Derivation
The phrase is built from its parts: 'over flight' refers to flying over a station rather than landing at one, and 'service frequencies' are the radio channels Flight Service monitors. The label tells the pilot which frequencies are usable from the air.
Why Pilots Care
Allows pilots without internet or other means to receive critical updates and file plans directly over the radio.
Intuition Check
Do not read this as meaning the information is available on every Flight Service frequency. It means it is available on the appropriate published Flight Service frequency for that location or route.
Example Sentence 1
Before departure, the pilot noted the available over flight service frequencies along the route so she could request weather updates en route.
Example Sentence 2
Before takeoff the student checked NOTAMs available over flight service frequencies since the airport had no internet briefing service.