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Introducing the CRL Scale

We are excited to announce the formal release of the novel Certification Readiness Level (CRL) scale, a core milestone of CONCERTO -a Clean Aviation project- that has been developed in partnership with EASA. It includes nine main steps:


concerto clean aviation crl scale easa

The CRL scale is designed to assess the future certificability of an innovative concept of operation, business model, and product/system, while engaging progressively with aviation authorities to facilitate future shared oversight activities. The CRL scale is offering a crucial complement to the traditional Technology Readiness Levels (TRLs). Interested parties like applicants, tech developers, or system suppliers requesting EASA Innovation Services, e.g. Innovation Partnership Contracts (IPCs) or Pre-Application Services Contracts (PACs), should familiarise themselves with this scale to measure the maturity level of their product or Concept of Operations (CONOPS).


As explicitly described in EASA's Innovation Services, the CRL scale will be further detailed as part of the future certification methods and means of compliance developed within CONCERTO. However, EASA encourages any applicant, technology developer and/or system supplier to familiarise themselves with this approach when measuring the growing level of maturity of product embedding innovative technology and/or concepts of operations.






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Clean Aviation

The project is supported by the Clean Aviation Joint Undertaking and its members.​

Horizon Europe

Funded by the European Union, under Grant Agreement No 101101999. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or Clean Aviation Joint Undertaking. Neither the European Union nor Clean Aviation JU can be held responsible for them.

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