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The Future Flight Standards Hub is designed to accelerate the development of Future Flight demonstrators and wider industry innovation based on emerging best practice, knowledge sharing, and standards support.

  • BSI Flex 1903 v2:2024-06 community preview

    This is an interactive version 2 of BSI Flex 1903. The aim of the standard is to create a lexicon of standard terms and acronyms used in this sector. Please note, content is still undergoing internal review and there may be minor changes at full publication.

    We welcome your engagement and comments on this version to help inform the development of the standard. 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 .

uncrewed aircraft observer (UAO)



  • Definition

    person, in communication with the remote pilot (3.1.118), who, by unaided visual observation of the uncrewed aircraft, assists the remote pilot in keeping the uncrewed aircraft in visual line of sight (VLOS) operation (3.1.145) and safely conducting the flight

    [SOURCE: UK CAA, CAP 722D, Unmanned aircraft system operations in UK airspace: Abbreviations and master glossary, modified – “unmanned aircraft” replaced by “uncrewed aircraft”; “positioned alongside the remote pilot” replaced by “in communication with the remote pilot”] [6]

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