Swiss electric-aviation supplier developing certification-grade propulsion battery systems and integrated electric propulsion for CS-23 aircraft.
Propulsion Architecture
Certification-oriented electric propulsion system centred on a modular lithium-ion Energy Storage System, battery management and aircraft integration; H55 is integrating Safran's certified ENGINeUS motor for the Bristell B23 Energic.
Primary Certification Context
Supplier / Component
Strengths
H55 completed an EASA-supervised, authority-witnessed propulsion-battery module certification test campaign in December 2025 using serial-conforming hardware. The company says more than 100 test articles covered environmental, functional, performance and worst-case safety conditions, including thermal-runaway tests without propagation. H55 also holds Swiss FOCA Production Organisation Approval and has delivered conforming certifiable modules to BRM Aero for aircraft integration.
Primary sources: H55 battery test campaign; B23 Energic module delivery.
Weaknesses / Open Questions
Completion of a certification test campaign is not the same as an issued aircraft or propulsion-system type certificate. H55's public material describes formal acceptance and aircraft-level integration work still progressing. The key evidence is regulator acceptance of the complete compliance package and service experience from production aircraft.
Last Updated
September 15, 2026
