![]() Voice remains the primary and controlling air/ground communications means. The CPDLC's principal operating criteria are: As a flight progresses from one sector to another, the pilot is requested to change to the appropriate sector discrete frequency.Ĭontroller Pilot Data Link Communications ( CPDLC) is a system that supplements air/ground voice communications. Each sector is handled by one or a team of controllers and has its own sector discrete frequency. Flight plan filing, en route weather, weather forecasts, and similar data should be requested through FSSs, company radio, or appropriate military facilities capable of performing these services.Īn ARTCC is divided into sectors. Since IFR operations are expedited through the use of direct communications, pilots are requested to use these frequencies strictly for communications pertinent to the control of IFR aircraft. ![]() Although they may be several hundred miles away from the ARTCC, they are remoted to the various ARTCCs by land lines or microwave links. These sites are located throughout the U.S. Maximum communications coverage is possible through the use of Remote Center Air/Ground ( RCAG) sites comprised of both VHF and UHF transmitters and receivers.
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