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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.

take-off and landing zone (TOLZ)



  • Definition

    site prepared for use by an uncrewed aircraft to take-off or land plus the area surrounding it which is maintained free from uninvolved persons, livestock or other hazards during take-off and landing


    NOTE TOLZ also applies to “vertical take-off and landing (VTOL)(3.1.87) , STOL or conventional fixed wing take-off and landing uncrewed aircraft. Dimensions vary according to the specific equipment and operator.

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