Airbus is looking towards a greener aviation future, revealing major projects to build hydrogen jet airliners with not only a complete hydrogen-fueled propulsion system, but also a hydrogen Auxiliary Power Unit (APU) to generate electricity onboard.
There's often talk about a new hydrogen economy, but there's much more to this than simply swapping out fossil fuels for hydrogen. The two are very different things and require much more than just an engine that's been modified to burn hydrogen. It requires complete systems and engineering at a very basic level.
In another project, Airbus UpNext is working on a demonstrator program to replace the 'hidden' engine on an airliner.