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UK Civil Aviation Regulations

These are published by the CAA on our UK Regulations pages. EU Regulations and EASA Access Guides published by EASA no longer apply in the UK. Our website and publications are being reviewed to update all references. Any references to EU law and EASA Access guides should be disregarded and where applicable the equivalent UK versions referred to instead.



However, its use as an aviation fuel is at an early stage of development and the sector does not yet have a comprehensive understanding of the potential risks to aviation safety this type of fuel may have nor the right pathway to certification.   

We are addressing these issues through our Hydrogen Challenge; this will use a Regulatory Sandbox approach to make sure regulation is fit for purpose and reduce challenges associated with the potential introduction of hydrogen fuel. 

Our challenge will facilitate collaboration with industry and academia to improve understanding of hydrogen-related risks in aviation, identify gaps in policies, and propose new recommendations to develop net-zero policies. 

This will allow for increased regulatory readiness, reduced risk of failure, and improved collaboration with the UK Civil Aviation Authority. 

The Fund, a grant-based fund is to enable UK regulators and local authorities to help create a UK regulatory environment that encourages business innovation and investment. The Hydrogen Challenge is funded with nearly £940,000 from the Regulators' Pioneer Fund, which is overseen by the Department for Science, Innovation, and Technology.  

The Hydrogen Challenge runs until 28 February 2025. More information on how to apply can be found out by emailing hydrogenchallenge@caa.co.uk.

Hydrogen Challenge Survey 2023

In support of our recent announcement launching our hydrogen challenge we want to facilitate collaboration between the regulator, industry, and academia to improve understanding of hydrogen-related risks in aviation, identify gaps in policies, and propose new recommendations to develop net-zero policies. 

Our survey on hydrogen has now closed. Thank you to those who took part in this exercise. We hope to share the findings of this very soon.

Regulatory Sandbox for Hydrogen as an Aviation Fuel

We are inviting industry, academia, and organisations to join our Regulatory Sandbox to test hydrogen technologies that support the use of hydrogen as an aviation fuel. The tests will identify hazards, risks, safety challenges and gaps in current CAA regulations and evaluate the proposed mitigations through verification and validation.

Our intention is that the hydrogen sandbox will enable appropriate stakeholders to test hydrogen technologies and show how the proposed mitigations will either comply with or close gaps in current CAA regulations. This outcome of testing will enable the proposal of recommendations to create new hydrogen policies.

Stakeholders were invited to share their views with us on developing and using hydrogen as an aviation fuel. Thank you to those who gave us their views. We hope to share the findings of this as the project progresses.