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21.A.91 Classification of changes to a type certificate

Regulation (EU) 2025/1065

Changes to a type certificate shall be classified as “minor” and “major”. A “minor change” has no appreciable effect on the mass, balance, structural strength, reliability, operational characteristics, certified noise or emissions levels, operational suitability data, or other characteristics affecting the airworthiness or the environmental compatibility of the product or of the UAS, or no appreciable effect on the reliability, operational characteristics, or other characteristics affecting the airworthiness of the CMU. Without prejudice to point 21.A.19, all other changes shall be considered “major changes” under this Subpart. Major and minor changes shall be approved in accordance with points 21.A.95 or 21.A.97, as appropriate, and shall be adequately identified.