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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.

powered lifted aircraft



  • Definition

    heavier-than-air aircraft capable of vertical take-off, vertical landing, and low-speed flight, which depends principally on engine-driven lift devices or engine thrust for the lift during these flight regimes and on non-rotating aerofoil(s) for lift during horizontal flight.

    NOTE: in addition to conventional phase of flight descriptions (e.g. take-off, climb, cruise, etc.), powered lift aircraft typically have an additional phase of flight, referred to as the transition phase, during which the primary means of generating lift transitions to/from the non-rotating aerofoils Also referred to as hybrid lift aircraft

    [SOURCE: ICAO Annex 1 to the Convention on International Civil Aviation, Personnel Licensing, 14th edition, July 2022] [19]

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