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Welcome to the Future Flight Standards Hub

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 .

conventional take-off and landing (CTOL) capability aircraft



  • Definition

    aircraft where either the safe lift-off and touchdown forward speed exceeds 45 knacross the ground, or the maximum forward speed for emergency touchdown exceeds 60 kn across the ground


    NOTE 1 All VTOL-capable aircraft (3.1.143) are able to take-off and land vertically. Some also have the additional capability to take-off or land as conventional aeroplanes, accelerating and/or decelerating on a runway.

    NOTE 2 CTOL aircraft design conditions include additional, more stringent considerations than VTOL-capable aircraft (3.1.43), e.g. those related to crashworthiness during landing.


    [SOURCE: EASA, Fourth publication of proposed means of compliance with the Special Condition VTOL] [17]

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