# Commission Regulation (EC) No 29/2009 of 16 January 2009 laying down requirements on data link services for the single European sky (Text with EEA relevance), Division 4

Extent: E+W+S+N.I.

The transmission and reception of bit frames between ground and aircraft communication systems shall be based on communication protocols fulfilling the conditions set out in Part D.

---
Source: https://www.legislation.gov.uk/eur/2009/29/annex/IV/part/C/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-29/annex-IV/part-C/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.