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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.

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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.

design verification



  • Definition

    evaluation of an implementation of design requirements to determine that the requirements have been met


    NOTE 1: In other words, "Did we design the aircraft/system/function/item in accordance with the requirements?”

    NOTE 2: The requirements include any applicable regulatory and safety requirements.

     NOTE 3: The design verification process is utilized by European Union Aviation Safety Agency (EASA) as a means of demonstrating compliance with “uncrewed aircraft system (UAS)” (3.1.83)  requirements for operations categorized as Specific Operations Risk Assessment (SORA) Specific Assurance Integrity Level (SAIL) III or IV within the specific category.  


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