We use necessary cookies to make our website work. We'd also like to use optional cookies to understand how you use it, and to help us improve it.

For more information, please read our cookie policy.

Along with other criteria that determine the threshold for a Technical Validation, Safety Emphasis Items (SEI) define further areas of Validating Authority (VA) interest during validation projects.

CAA uses SEIs in the CAA validation of foreign authority design approvals in accordance with the Implementation Procedures established with that authority.

Where the use of SEIs is prescribed in the respective Implementation Procedures the following SEI Lists apply:

CS-25 - Large Aeroplanes

CS-23 - Normal-Category Aeroplanes

CS-27 & CS-29 – Small & Large Rotorcraft

CS-E - Engines

News from UK Civil Aviation Authority

  1. UK Civil Aviation Authority appoints new Non-Executive Director
  2. UK Civil Aviation Authority Statement: Play Airlines (Iceland)
  3. UK aviation regulator proposes reform of how UK airspace is modernised