# 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: Definition of ATC Microphone Check service (AMC)

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

The AMC service shall provide air traffic controllers with the capability to send an instruction to several data link equipped aircraft, at the same time, in order to instruct flight crews to verify that their voice communication equipment is not blocking a given voice channel.
This instruction shall only be issued to those aircraft tuned to the frequency that is blocked.
The exchanges between airborne and ground data link systems for the execution of AMC service shall comply with:
operating methods and time sequence diagrams specified in Sections 5.3.1.1.1, 5.3.1.1.2 and 5.3.1.2 of the Eurocae document identified in point 11 of Annex III,
safety requirements specified in Section 5.3.2.3 of the Eurocae document identified in point 11 of Annex III,
performance requirements specified in Section 5.3.3.2 of the Eurocae document identified in point 11 of Annex III.

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