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CAA gives green light for next phase of ZeroAvia’s test flights
ZeroAvia has secured a Part 21 permit to fly for a retrofitted Dornier 228 following a successful ground testing campaign. This paves the way for test flights of a 19 seat testbed early this year.
ZeroAvia’s Dornier 228 testbed is expected to become the largest aircraft to ever fly using a hydrogen-electric powertrain.
Read this story in our January 2023 printed issue.

The UK's Civil Aviation Authority (CAA) has granted a permit to fly for ZeroAvia's Dornier 228 aircraft, which has been retrofitted with its prototype hydrogen-electric powertrain. ZeroAvia secured the permit to fly following an extensive ground testing campaign and a rigorous review of the full development programme.

It means that ZeroAvia can now begin the first test flights of its 600kW hydrogen-electric powertrain. The 19 seat, twin engine aircraft has been retrofitted in an engineering testbed configuration to incorporate ZeroAvia's hydrogen-electric engine powering the propellor on its left wing, operating alongside a single Honeywell TPE-331 stock engine on the right for appropriate redundancy to allow the safe testing of the novel propulsion technology.

The test flights are set to be a landmark achievement for ZeroAvia and the HyFlyer II project, a major R&D programme backed by the UK Government's ATI Programme, which targets the development of a 600kW hydrogen-electric powertrain for nine to 19 seat aircraft.

For this testing programme, ZeroAvia has worked with the CAA in meeting a far more stringent set of requirements when compared to the E-Conditions framework ZeroAvia had used for its six seat prototype in 2020. Part 21 is an industry standard term used to describe the regulatory approval of aircraft design and production organisations, and the certification of products, parts and appliances for aircraft. Securing this permit to fly is a significant milestone in ZeroAvia's path towards commercialisation.

Founder and CEO Val Miftakhov says: “Earning our full Part 21 permit to fly with the CAA is a critical milestone as we develop a zero-emission aviation propulsion system that will be the most environmental and economical solution to the industry's climate impact. We're going to be starting 2023 in the best way possible, by demonstrating through flight that true zero-emission commercial flight is much closer than many think."

It will pave the way for a commercially certifiable configuration for ZA600 to be submitted by the end of 2023, ahead of delivering powertrains for the first commercial routes for nine to 19 seat aircraft to commence by 2025. With 1,500 engines under pre-order, partnerships with seven aircraft manufacturers and multiple fuel and airport partnerships, ZeroAvia is well positioned to lead the industry's transformation to a clean future.

When test flights begin in January, ZeroAvia's Dornier 228 testbed is expected to become the largest aircraft to ever fly using a hydrogen-electric powertrain.

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