ZeroAvia successfully carries out the first flight test of its Dornier 228 19-seat testbed with hydrogen-electric engines.
Photo Credit: ZeroAvia

ZeroAvia flies the largest aircraft powered by a hydrogen-electric engine

LONDON – Zero-emission flight took a giant step forward today with ZeroAvia flying the largest aircraft in the world to be powered by a hydrogen-electric engine.

The leader in zero-emission aviation took to the skies for the maiden flight of its 19-seat Dornier 228 testbed aircraft, retrofitted with a full-size prototype hydrogen-electric powertrain on the left wing of the aircraft.

First Flight At Gloucestershire, UK


The flight took place from the company’s R&D facility at Cotswold Airport in Gloucestershire, UK, and lasted 10 minutes. At 13.35 pm GMT this afternoon the aircraft completed taxi, take-off, a full pattern circuit, and landing.

The landmark flight forms part of the HyFlyer II project, a major R&D programme backed by the UK Government’s flagship ATI Programme, which targets the development of a 600kW powertrain to support 9-19 seat aircraft worldwide with zero-emission flight. 

The twin-engine aircraft was retrofitted to incorporate ZeroAvia’s hydrogen-electric engine on its left wing, which then operated alongside a single Honeywell TPE-331 stock engine on the right.

In this testing configuration, the hydrogen-electric powertrain comprises two fuel cell stacks, with lithium-ion battery packs providing peak power support during take-off and adding additional redundancy for safe testing.

For the aircraft configuration, hydrogen tanks and fuel cell power generation systems were housed inside the cabin. In a commercial configuration, external storage would be used and the seats restored.

All systems performed as expected. This is the largest ZeroAvia engine tested to date and places the company on the direct path to a certifiable configuration to be finalized and submitted for certification in 2023.

The programme also serves as the key to unlocking speedy technology development for larger aircraft.

Opening Future Potential


ZeroAvia’s 2-5 MW powertrain programme, already underway, will scale the clean engine technology for up to 90-seat aircraft, with further expansion into narrowbody aircraft demonstrators over the next decade.

Of note, this flight test campaign is being conducted under a full Part 21 flight permit with the UK CAA, which is a much more stringent set of requirements compared to the E-Conditions framework ZeroAvia used for its 6-seat prototype test flights in the prior years.

This signifies the maturity of the company’s processes and designs approaches and its readiness to proceed towards full commercial certification of its power plants.

ZeroAvia will now work towards its certifiable configuration in order to deliver commercial routes using the technology by 2025.

The Dornier 228 will conduct a series of test flights from Kemble and later demonstration flights from other airports. Almost exactly two years ago, ZeroAvia conducted the first of more than 30 flights of a six-seat Piper Malibu aircraft using a 250kW hydrogen-electric powertrain.

Celebrating this remarkable progress, Val Miftakhov, Founder and CEO of ZeroAvia said: “This is a major moment, not just for ZeroAvia, but for the aviation industry as a whole, as it shows that true zero-emission commercial flight is only a few years away.”

“The first flight of our 19-seat aircraft shows just how scalable our technology is and highlights the rapid progress of zero-emission propulsion. This is only the beginning – we are building the future of sustainable, zero climate impact aviation.”

“Our approach is the best solution to accelerate clean aviation at scale. Congratulations to everyone on our team and all of our partners and stakeholders for the collective effort that brought us to this monumental day in history.” 

Previous prototype flights


This latest achievement follows ZeroAvia’s previous world-first milestones, starting with 6-seat prototype flights of a Piper M-Class airframe in 2019, and the world’s first commercial-scale 6-seater hydrogen-electric powered flight in September 2020.

The 2020 prototype was a part of the HyFlyer I programme in the UK. Unlike the previous tech demonstrator programme, ZeroAvia’s 600kW engine being developed under HyFlyer II is a commercial-intent programme. 

Today’s historic first flight follows significant commercial momentum for ZeroAvia in recent months, including an engine order from American Airlines.

The company also has a partnership agreement with OEM Textron Aviation and infrastructure partnerships with airports including Rotterdam, Edmonton International and AGS Airports.

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