The CPDLC message set is contained in ICAO Doc 4444: PANS-ATM, Annex 5. The global communication procedures are detailed in the ICAO Provisions: Annex 10 Volume III Part 1 Chapter 3. The CPDLC is being globally implemented and currently is in different implementation stages. A “free text” capability is also provided to exchange information not conforming to defined formats. The pilots are provided with the capability to respond to messages, to request/receive clearances and information, and to report information. The controllers are provided with the capability to issue ATC clearances (level assignments, lateral deviations/vectoring, speed assignments, etc), radio frequency assignments, and various requests for information. It enables a number of data link services (DLS) that provide for the exchange of communication management and clearance/information/request messages which correspond to voice phraseology employed by air traffic control procedures. The CPDLC application provides air-ground data communication for the ATC service. The message is displayed on a flight deck visual display. (ICAO Doc 4444: PANS-ATM) DescriptionĬPDLC 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. DefinitionĬontroller Pilot Data Link Communications (CPDLC) is a means of communication between controller and pilot, using data link for ATC communications. The goal is to provide background information for understanding the safety issues related to this technology. It describes the main principles, the different data link services and the basics of CPDLC operations, including related phraseology. This article gives an overview of Controller Pilot Data Link Communications (CPDLC).
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