Eurocontrol has published new controller–pilot data link communications (CPDLC) operational guidelines for aircraft operators, aiming to standardize and improve data link use across European airspace. The document targets airline and business aviation operators already subject to the European data link services implementing rule, which mandates CPDLC capability for IFR general air traffic above FL285 in designated airspace.
The guidance details best practices for CPDLC logon and logoff, including logon timing, correct use of addresses and re-logon management, and emphasizes consistent use of standard uplink and downlink messages while limiting free-text entries. It sets expectations for coordination between CPDLC and VHF voice, reaffirming voice as the primary medium and clarifying how to manage parallel or conflicting clearances.
The guidelines also cover failure management and reversion to voice, with links to minimum equipment list policies and the handling of flights operating under exemptions or temporary outages. They stress that CPDLC capability requires both certified airborne equipment and appropriately trained crews, and that operators must ensure alignment between flight plan entries such as J1 or DAT/CPDLCX and the aircraft’s real operational status.
Eurocontrol underlines the safety benefits of CPDLC, including fewer readback and hearback errors, better traceability of clearances and improved workload management in high-density traffic. The new guidance builds on a sharp increase in European CPDLC coverage and equipage, with most upper airspace sectors and a large majority of IFR aircraft now capable of using data link services.