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De Havilland Dash 8 Series

29/07/2026News:
Collins Aerospace supplied the 1-megawatt electric motor and motor controller for the hybrid-electric system.

Pratt & Whitney completes hybrid-electric ground tests

Initial testing of the flight-standard propulsion system and propeller has been completed in Longueuil, paving the way for installation on a Dash 8-100 testbed.

18/06/2026News:
H55 has accumulated more than 2,000 flight hours without a battery-related incident.

H55 powers ahead with RTX flight demonstrator battery

Certification-grade modules have entered active flight-test integration, reinforcing the company's readiness to support future hybrid-electric aircraft programmes.

18/03/2026Press Release:
RTX Hybrid-Electric Flight Demonstrator - RTX Corp, Battery Module H55 - H55		H55 battery technology helps power progress of RTX Hybrid-Electric Flight Demonstrator
05/02/2026News:
H55’s Propulsion Battery Module, which successfully completed all regulator-required certification tests.

H55 clears key battery certification hurdle

EASA-supervised test campaign confirms ability to contain worst-case failures, enabling scalable commercialisation of electric aircraft propulsion systems.

17/07/2025Press Release:
ZeroAvia granted raft of new patents key to the development of large hydrogen aviation engines

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