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  • Foreword

    Publishing Information

    This BSI Flex was sponsored by UK Research and Innovation (UKRI). Its development was facilitated by BSI Standards Limited, and it was released under licence from The British Standards Institution. It came into effect in May 2024.

    Acknowledgement is given to Anthony Venetz as the technical author, and the following organizations that were involved in the development of this BSI Flex as members of the Advisory Group:

    • ABOUT:ENERGY LIMITED
    • Across Safety Development Ltd
    • Arcadis Consulting (UK) Ltd
    • ARPAS- UK
    • Bird & Bird LLP
    • Auriga Aerospace
    • Blue Bear Systems Research
    • Burges Salmon LLP
    • Cranfield University
    • Dronecloud
    • envAero Ltd
    • Flight Crowd
    • HeroTech8
    • Midlands Aerospace Alliance
    • UKRI

    Acknowledgement is also given to the identified broader stakeholders who were consulted in the development of this version of the BSI Flex

    The British Standards Institution retains ownership and copyright of this BSI Flex. BSI Standards Limited, as the publisher of the BSI Flex, reserves the right to withdraw or amend this BSI Flex on receipt of authoritative advice that it is appropriate to do so.

    This BSI Flex is not to be regarded as a PAS or British Standard.

    The BSI Flex process enables a standard to be rapidly developed, on an iterative basis, in order to fulfil an immediate stakeholder, need. A BSI Flex can be considered for further development as a PAS or British Standard or constitute part of the UK input into the development of a European or international standard.

    The content in this version is part of an iterative process. It is likely to change from time to time with subsequent iterations.

    Supercession

    This Version of BSI Flex 1903 supercedes BSI Flex 1903 v1.0:2023:08, which is withdrawn.

    Relationship with other publications

    This BSI Flex is part of the Future Flight programme, which includes the following standards:

    • Flex 1904:2024 v.1 – Operational Design Domain (ODD) taxonomy for a future flight aircraft system – Specification1
    • PAS 1905 – Future flight systems – Regulatory principles, management system and design assurance processes – Guide1
    • BSI Flex 1906 v1 – Future Flight Systems – Acceptable means of compliance to Specific Operation Risk Assessment (SORA) for Uncrewed aircraft systems (UAS) – Guide1

    Information about this document

    This is Version 2.0 of BSI Flex 1903, which is the last planned version of the document. All comments received will be reviewed to inform the future direction of this document. Interested parties are encouraged to check the BSI website for updates regarding any future plans.

    This is a full update of the document, and introduces the following principle changes:

    • terms specifically requested by the Civil Aviation Authority (CAA) during the public consultation on Version 1;
    • additional amended terms following the public consultation on Version 1; and
    • new terms related to the subject areas of batteries and electrification and airworthiness.

    This publication can be withdrawn, revised, partially superseded, or superseded. Information regarding the status of this publication can be found in the Standards Catalogue on the BSI website at knowledge.bsigroup.com, or by contacting the Customer Services team.

    Where websites and webpages have been cited, they are provided for ease of reference and are correct at the time of publication. The location of a webpage or website, or its contents, cannot be guaranteed.

    Copyright is claimed in definitions 3.1.1, 3.1.15, 3.1.25, 3.1.26, 3.1.30, 3.1.32, 3.1.33, 3.1.37, 3.1.47, 3.1.59, 3.1.60, 3.1.71, 3.1.86, 3.1.96, 3.1.98, 3.1.107, 3.1.113, 3.1.120, 3.1.129, 3.1.140 and 3.1.143. Copyright holder is European Union Aviation Safety Agency (EASA), Konrad-Adenauer- Ufer 3, · D-50668 Cologne, Germany. Used with kind permission of EASA.

    Copyright is claimed in definitions 3.1.3, 3.1.9, 3.1.35, 3.1.41, 3.1.44, 3.1.72, 3.1.109, 3.1.110, 3.1.115, 3.1.116, 3.1.135, 3.1.144 and 3.1.145. Copyright holder is UK Civil Aviation Authority (CAA), Aviation House, Gatwick Civil Aviation Authority, Aviation House Beehive Ringroad, Crawley, West Sussex, RH6 0YR, UK. Used with kind permission of the CAA.

    Copyright is claimed in definitions 3.1.4, 3.1.11, 3.1.12, 3.1.13, 3.1.19, 3.1.40, 3.1.45, 3.1.52, 3.1.55, 3.1.121, 3.1.133, 3.1.134, 3.1.137, 3.1.138, and 3.1.139. Copyright holder is International Civil Aviation Organization (ICAO), 999 Robert-Bourassa Boulevard, Montréal, Québec H3C 5H7, Canada. Used with kind permission of ICAO.

    Copyright is claimed in definitions 3.1.14, 3.1.27, and 3.1.126. Copyright holder is RTCA, Inc, 1150 18th Street, NW, Suite 910, Washington, DC 20036 USA. Used with the kind permission of RTCA, Inc.

    Copyright is claimed in definitions 3.1.14, 3.1.27, and 3.1.126. Copyright holder is RTCA, Inc, 1150 18th Street, NW, Suite 910, Washington, DC 20036 USA. Used with the kind permission of RTCA, Inc.

    Copyright is claimed in definition 3.1.48. Copyright holder is Vehicle Certification Agency (VCA), Wesley House, Bull Hill, Leatherhead, Surrey, KT22 7AH, UK. Used with permission of VCA.

    Copyright is claimed in definitions 3.1.61, 3.1.62, and 3.1.63, Copyright holder is ASTM, 100 Barr Harbor Drive, Conshohocken, PA, USA. Reprinted, with permission, from ASTM International, ASTM F3338- – 18: Standard specification for design of electric propulsion units for general aviation aircraft, October 2021, copyright ASTM International. A copy of the complete standard can be obtained from www.astm.org.

    Copyright is claimed in definitions 3.1.64, and 3.1.65. Copyright holder is International Electrotechnical Commission (IEC), Rue de Varembé 3, · 1202 Geneva, Switzerland. BSI thanks IEC for permission to reproduce information from its International Standards. All such extracts are copyright of IEC, Geneva, Switzerland. All rights reserved. Further information on the IEC is available from www.iec.ch. IEC has no responsibility for the placement and context in which the extracts and contents are reproduced by the author, nor is IEC in any way responsible for the other content or accuracy therein.

    Copyright is claimed in definition 3.1.68. Copyright holder is ASTM, 100 Barr Harbor Drive, Conshohocken, PA, USA. Reprinted, with permission, from ASTM International, ASTM, F2840-14: Standard practice for design and manufacture of electric propulsion units for light sport aircraft, copyright ASTM International. A copy of the complete standard can be obtained from www.astm.org.

    Copyright is claimed in definitions 3.1.69, 3.1.127 and 3.1.128. Copyright holder is European Organisation for Civil Aviation Equipment (EUROCAE), 9 rue Paul Lafargue 93200 Saint Denis – France. Used with kind permission of EUROCAE.

    Copyright is claimed in definitions 3.1.74, 3.1.75 and 3.1.114. Copyright holder is Cambridge University Press (CUP), University Printing House, Shaftesbury Road, Cambridge, CB2 8BS, UK. Used with the kind permission of CUP.

    Copyright is claimed in definitions 3.1.87, 3.1.88, and 3.1.89. Copyright holder is ASTM, 100 Barr Harbor Drive, Conshohocken, PA, USA. Reprinted, with permission, from ASTM International, Autonomy design and operations in aviation: Terminology and requirements framework, 2019, copyright ASTM International. A copy of the complete standard can be obtained from www.astm.org.

    Copyright is claimed in definition 3.1.100. Copyright holder is Office of Communications, Riverside House 2A Southwark Bridge Road, London SE1 9HA United Kingdom.

    Use of this document

    It has been assumed in the preparation of this BSI Flex that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.

    Presentational conventions

    The definitions in this document are presented in roman (i.e. upright) type.

    Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.

    Where words have alternative spellings, the preferred spelling of the Shorter Oxford English Dictionary is used (e.g., “organization” rather than “organisation”).

    Contractual and legal considerations

    This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness, or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

    This publication is to be used at the recipient’s own risk.

    The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

    This publication is not intended to constitute a contract. Users are responsible for its correct application.

    Compliance with a BSI Flex cannot confer immunity from legal obligations.

    1) In preparation
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