Definition
A radio frequency used by a ground-based station, such as a Flight Service Station (FSS), to transmit information and advisories to aircraft in flight or on the airport surface.
Plain English
A radio channel that lets people on the ground talk to pilots in the air or on the airport.
Context Anchor
Seen in Local Airport Advisory discussions, where a flight service station may provide airport information to nearby aircraft by radio.
Derivation
Frequency comes from a Latin word meaning how often something happens. In radio, it means how often a radio wave repeats each second. Ground-to-air simply identifies the communication path: between a ground facility and an aircraft.
Why Pilots Care
At airports with Local Airport Advisory service, pilots use the published ground-to-air frequency to receive traffic, wind, runway, and other advisory information that helps them operate safely without a control tower.
Intuition Check
Do not read ground-to-air as only one-way communication from the ground to the airplane. In this context, it means the radio channel used for communication between aircraft and a ground facility.
Example Sentence 1
Before entering the traffic pattern, the pilot tuned in the published ground-to-air frequency to receive the latest airport advisory from the FSS.
Example Sentence 2
At the non-towered airport the FSS specialist used the ground-to-air frequency to relay wind and runway information to arriving aircraft.