Definition
An unstaffed, remotely controlled radio facility located on or near an airport that allows pilots on the ground to contact Air Traffic Control or a Flight Service Station by VHF radio. The pilot keys the microphone a set number of times to establish a telephone link through the GCO to the appropriate facility, primarily for picking up IFR clearances or closing flight plans at airports without a control tower or direct radio coverage.
Plain English
A radio box at a small airport that lets a pilot on the ground call ATC or Flight Service through a phone link, just by clicking the mic a few times on the right frequency.
Context Anchor
Seen at some non-towered airports, especially when a pilot needs to contact air traffic control or flight service before takeoff or after landing.
Derivation
“Outlet” originally means a place where something goes out or is released. In this term, it means an access point for communication, not an electrical socket.
Why Pilots Care
Gives pilots at remote or uncontrolled airports a direct way to receive IFR clearances, file flight plans, or get weather without driving to a phone.
Intuition Check
Do not read “outlet” as a power outlet. A Ground Communication Outlet is a radio access point for talking to air traffic control or flight service from the ground.
Example Sentence 1
Before takeoff from the non-towered field, the pilot tuned the GCO frequency and keyed the mic four times to reach Center for an IFR clearance.
Example Sentence 2
After landing at the remote strip the pilot contacted Flight Service through the Ground Communication Outlet to close the flight plan.