Controller-Pilot Data-Link Communications (CPDLC) is an air/ground data-link application operated at the Upper Area Control Centre, which enables the exchange of text messages between controllers and pilots. In other words, CPDLC is a two-way data-link system by which controllers can transmit non urgent 'strategic messages to an aircraft as an alternative to voice communications. The message is displayed on a flight deck visual display. The CPDLC application provides air-ground data communication for the ATC service.
CPDLC complements traditional voice communications, providing pilots and controllers with an additional communications medium. The objective of CPDLC is to improve the safety and efficiency of air traffic management.
CPLDC is used to exchange routine, non-time-critical messages at strategic level between aircrews and controllers. If urgent messages need to be exchanged at tactical level, traditional voice communications are used.
Sources:
https://code7700.com/communications_cpdlc.htm
https://www.icao.int/…/Do…/Meetings/2016/ATS/DATALINKP07.pdf
https://www.faa.gov/…/Order_7110.125_Controller_Pilot_Data_…
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