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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.

segregated beyond visual line of sight (S-BVLOS) operations



  • Definition

    beyond visual line of sight (BVLOS) (3.1.19) operation where the primary means of achieving safe separation from crewed aircraft is using airspace structures which are intended to reduce the likelihood of an otherwise unmitigated encounter with a crewed aircraft to an acceptable level.


    NOTE: Examples of airspace structures which can be used for segregation include permanent or temporary danger areas, prohibited and restricted areas.

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