The UK Civil Aviation Authority has published its UK CAA Hydrogen Challenge Hydrogen Aviation: A Regulatory Roadmap to 2050.
This report sets out how the UK can enable the safe, timely and scalable introduction of hydrogen powered flight. It has been developed by the Civil Aviation Authority (CAA), as part of the Hydrogen Challenge with input from a range of stakeholders. The roadmap supports UK decarbonisation policy objectives, including the delivery of net zero UK aviation by 2050, by setting out the regulatory sequencing and evidence required while reflecting the CAA’s core role: protecting people and enabling aerospace through proportionate, evidence-led safety regulation.
To support consistent planning, the regulatory roadmap is structured around three “maturity-based time periods”, starting from the current day, which are used in the report:
Demonstrate (2026-2030): Trials, demonstrations and evidence generation using small or modified aircraft under controlled conditions, with both low and highpowered propulsion systems <1MW and >1MW. Early aerodrome activity focuses on initial GH₂ refuelling trials at selected sites. Activity is enabled through the Hydrogen Challenge programme with evidence informing regulatory gap assessments, early Special Conditions (SCs) and draft guidance developed in parallel.
Prove (2030-2035): Repeatable certification, operational and infrastructure frameworks are developed and applied to support initial, limited commercial operations on suitable routes and aerodromes. Hydrogen specific regulatory material and guidance are consolidated, and aerodrome arrangements mature toward more standardised, business as usual approaches.
Scale and sustain (2035 onwards): Hydrogen aviation is embedded within routine regulatory oversight and operations, aligned with technology maturity, aerodrome investment cycles and wider energy system readiness. Training, emergency response and oversight become established as normal activities, supported by stable domestic frameworks compatible with international obligations.
For more information
https://www.caa.co.uk/data-and-publications/publications/documents/content/cap3284c/