H55 has completed the electric aviation industry's first regulator-required and authority-witnessed propulsion battery module certification test sequence. The EASA-supervised campaign, finalised in December 2025, demonstrated that its system could contain worst-case battery failures, including thermal runaway events, without propagation.

Over a six-month period, H55 produced more than 100 test articles built to serial-manufacturing standards. The test results confirmed the readiness of its propulsion battery system for certification and industrial deployment. The campaign took place in a certified production facility using approved hardware, validating H55’s production capability alongside its engineering approach.

H55’s patented Energy Storage System uses cell-level monitoring, redundancy and hazard mitigation to protect against failure. This architecture enables certification evidence to be reused across multiple aircraft platforms and programmes, reducing risk for operators, manufacturers, and insurers. The system has already been adopted by partners including BRM Aero, CAE, and Pratt & Whitney Canada.

With over 2,000 electric flight hours and zero battery-related incidents, H55 has shown operational depth in executing certifiable electric aviation programmes. Co-founder André Borschberg says: “This milestone validates our focus on designing to aviation certification standards, not just making flight possible.”

H55 is now submitting final test reports to EASA, and with FAA recognition also underway, the path is open for global certification and industrial scale-up.