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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.

electric/hybrid propulsion system (EHPS)



  • Definition

    system that produces lift, thrust or power for flight, including sub-systems which provide thrust, lift or power to a device that itself provides thrust or lift


    NOTE 1 An electric and/or hybrid propulsion system might include but is not limited to: electric engines; turbine engines; piston engines; generators; electrical power generation; distribution; wirings; propulsion batteries; integrated fans; cooling systems; controllers; power management system.

    NOTE 2 A propulsion battery associated to an electric engine providing power to a propeller is considered to be an EHPS. A propulsion battery alone (without any electric engine) cannot be considered as an EHPS.

    [SOURCE: EASA Special Condition, SC E-19, Electric / Hybrid Propulsion System Issue 1, April 2021, modified] [14]

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