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  • BSI Flex 1903 v1:2023-08 formally released

    This is an interactive version 1 of BSI Flex 1903 v1.0:2023-08. The aim of the standard is to create a lexicon of standard terms and acronyms used in this sector.

    We welcome your engagement and comments on this version to help inform the development of the next version. Comments on clauses or terms in the standard should be made via the BSI Standards Development Portal. We would also welcome general feedback including what terms could be considered for future versions and these can be made through our dedicated feedback page.

direct command and control link



  • Definition

    data link architecture established between uncrewed aircraft (UA) (3.1.82) and its command unit, which is self-contained, does not require any third-party services and enables real-time command and control.


    NOTE Typically relies on a wireless communication system such as radio frequency (RF) (3.1.73)  communication with devices located within radio line of sight (3.1.74) of one another.

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