--- title: "SERA.15001 – SERA.15050: SECTION 15 Controller-pilot data link communication (CPDLC) procedures (ANNEX: Rules of the Air, SERA) — rule index · Avioverse" description: "SERA.15001 – SERA.15050, Regulation (EU) No 923/2012. The logon address associated with an air traffic services unit shall be published in the national…" url: "https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15" --- # SECTION 15 Controller-pilot data link communication (CPDLC) procedures ANNEX: Rules of the Air · Standardised European Rules of the Air (SERA) · Regulation (EU) No 923/2012 · SERA.15001 – SERA.15050 On this page 1. ## [SERA.15001 Data link initiation and data link initiation failure](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15001) The logon address associated with an air traffic services unit shall be published in the national aeronautical information publications (AIPs). 2. ## [SERA.15005 Establishment of CPDLC](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15005) CPDLC shall be established in sufficient time in advance to ensure that the aircraft communicates with the appropriate air traffic control unit. 3. ## [SERA.15010 Transfer of CPDLC](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15010) When CPDLC is transferred, the transfer of voice communication and CPDLC shall commence concurrently. 4. ## [SERA.15015 Construction of CPDLC messages](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15015) The text of CPDLC messages shall be composed in standard message format, in plain language, or in abbreviations and codes. 5. ## [SERA.15020 Responding to CPDLC messages](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15020) Unless otherwise specified by the competent authority, voice read-back of CPDLC messages shall not be required. 6. ## [SERA.15025 Correction of CPDLC messages](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15025) When a correction to a CPDLC message is deemed necessary or when the contents of such a message need to be clarified, the air traffic controller and the… 7. ## [SERA.15030 Controller data link communication procedures for emergencies, hazards, and CPDLC equipment failure](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15030) When an air traffic controller or a pilot is alerted that a single controller-pilot data link communication message has failed, the air traffic… 8. ## [SERA.15035 Intentional shutdown of CPDLC system](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15035) When a system shutdown of the communications network or the CPDLC ground system is planned, a NOTAM shall be published to inform all affected parties of… 9. ## [SERA.15040 Discontinuation of the use of CPDLC requests](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15040) When a controller requires all stations or a specific flight to avoid sending CPDLC requests for a limited period of time, the following phrase shall be… 10. ## [SERA.15045 Use of CPDLC in the event of air-ground voice communication failure](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15045) The existence of a CPDLC connection between an air traffic services unit and an aircraft should not prevent the pilot and the air traffic controller… 11. ## [SERA.15050 Testing of CPDLC](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-15/sera-15050) Where the testing of CPDLC with an aircraft could affect the air traffic services being provided to the aircraft, coordination shall be effected prior to… Consolidated from the EASA Easy Access Rules (revision 26 Aug 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use. Share [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Favioverse.aero%2Fregulations%2Feasa%2Fsera%2Fannex-rules-of-the-air%2Fsection-15)[X](https://twitter.com/intent/tweet?url=https%3A%2F%2Favioverse.aero%2Fregulations%2Feasa%2Fsera%2Fannex-rules-of-the-air%2Fsection-15\&text=SECTION%2015%20Controller-pilot%20data%20link%20communication%20\(CPDLC\)%20procedures%20%E2%80%94%20SERA)