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21L.A.23 Demonstration of design capability

Annex Ib · Regulation (EU) No 748/2012 · EAR revision 27 Nov 2025

IRImplementing rule

21L.A.23Demonstration of design capability

An applicant for a type certificate shall demonstrate their design capability by:

(a)holding a design organisation approval with terms of approval that cover the respective category of the product, issued by the Agency in accordance with Subpart J of Section A of Annex I (Part 21); or

(b)declaring their design capability for the type of design work and the category of the product in accordance with Subpart J of this Annex.

IR · 21L.A.23 — Regulation (EU) No 748/2012 · Regulation (EU) 2022/1358 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GMGuidance material

GM1 21L.A.23(a)Demonstration of design capability

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TERMS OF APPROVAL COVERING THE RESPECTIVE PRODUCT CATEGORY If an applicant holds a design organisation approval (DOA) issued under Subpart J of Annex I (Part 21) and it wishes to use this approval to meet the eligibility criteria of point 21L.A.23, that applicant will need to apply for a change to the terms of approval to include the new aircraft type within the list of products.

GM · GM1 21L.A.23(a) — Regulation (EU) No 748/2012 · ED Decision 2023/013/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GMGuidance material

GM1 21L.A.23(b)Demonstration of design capability

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DECLARATION OF DESIGN CAPABILITY Organisations that have declared their design capability under Subpart J of Annex Ib (Part 21 Light) should update their declaration of design capability to include the new product type when submitting a new application for a type certificate (see point 21L.A.173 ‘Scope of work’).

GM · GM1 21L.A.23(b) — Regulation (EU) No 748/2012 · ED Decision 2023/013/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

All rules in SECTION A - TECHNICAL REQUIREMENTS

Consolidated from the EASA Easy Access Rules (revision 27 Nov 2025, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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