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

• Regulation (EU) 2019/897 found in: Initial Airworthiness and Environmental Protection (748/2012) Part-21 Part-21L (Jul 2024)
• Regulation (EU) 2025/1065 found in: Initial Airworthiness and Environmental Protection (748/2012) (Nov 2025)

21.A.91 Classification of changes to a type-certificate Regulation (EU) 2019/897 Changes to a type-certificate are classified as minor and major. A “minor change” has no appreciable effect on the mass, balance, structural strength, reliability, operational characteristics, operational suitability data, or other characteristics affecting the airworthiness of the product or its environmental characteristics. Without prejudice to point [21.A.19](#_DxCrossRefBm1649096992), all other changes are “major changes” under this Subpart. Major and minor changes shall be approved in accordance with points [21.A.95](#_DxCrossRefBm1649097008) or [21.A.97](#_DxCrossRefBm1649096997), as appropriate, and shall be adequately identified. #### 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](#_DxCrossRefBm485230483), 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](#_DxCrossRefBm485230499) or [21.A.97](#_DxCrossRefBm485230488), as appropriate, and shall be adequately identified.