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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 .

cooperative surveillance system



  • Definition

    system where multiple aircraft collaborate and share surveillance information between themselves and/or a ground-based network to enhance situational awareness, improve safety, and optimize airspace utilization


    NOTE 1 An air navigation service provider (ANSP)(3.1.3) can utilize a cooperative surveillance system and a flight information display (FID) to support the provision of flight information service (FIS). In addition to the aircraft position, a FID is normally expected to display aircraft flight identification (callsign or aircraft registration), aircraft type, altitude and speed.

    NOTE 2 Cooperative surveillance relies on aircraft having a functioning electronic conspicuity capability which is appropriate to the particular cooperative surveillance system. Typical examples of equipment used are automatic dependent surveillance-broadcast (ADS-B)(3.1.19)  and “secondary surveillance radar (SSR)” (3.1.121) transponders which operate on licensed aeronautical radio frequency (RF)(3.1.114)  frequency bands. Some systems also utilize a cellular network.

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