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21L.A.5 Collaboration between design and production

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

IRImplementing rule

21L.A.5Collaboration between design and production

The holder of a type certificate, supplemental type certificate, approval of a change to type certificate or approval of a repair design, the declarant of a declaration of design compliance, and the organisation or the natural or legal person producing products or parts of that specific design shall collaborate so as to ensure that the product or part are in conformity to that design and to ensure the continued airworthiness of the product or part.

IR · 21L.A.5 — Regulation (EU) No 748/2012 · Regulation (EU) 2022/1358 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

AMCAcceptable means of compliance

AMC1 21L.A.5Collaboration between design and production

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TRANSFER OF INFORMATION ON ELIGIBILITY AND STATUS FROM THE DESIGNER TO A PRODUCTION ORGANISATION Where there is a need to provide (normally outside the organisation or entity responsible for design) a visible statement of approved or declared design data or airworthiness, or environmental protection data associated with the approved or declared design data, the following minimum information should be provided. The need for a visible statement may be in relation to an organisation that holds a production organisation approval (POA) in relation to point 21.A.163(c) or a registered declaration of production capability (declared production organisation) or a natural or legal person using Subpart R. Information to be provided: Company name: the name of the responsible organisation (or natural or legal person) for design (type certificate, supplemental type certificate, approval of repair or minor change design, declarant of a declaration of design compliance) that issues the information. Date: the date at which the information is released. Eligibility: indicate the specific products for which data has been approved or declared. Identification: the part number of the part. Preference should be given to the use of the Illustrated Parts Catalogue (IPC) designation. Alternatively, the reference to the instructions for continued airworthiness (e.g. service bulletins (SBs), aircraft maintenance manual (AMM), etc.) could be stated. Marking requirements of Part 21 Light Section A Subpart Q should be taken into account. Description: the name or description of the part or document should be given. In the case of a part, preference should be given to the use of the IPC designation. The description should include reference to any applicable European Parts Approval (EPA) marking, or previous national approvals still valid. Purpose of data: the reason for the provision of the information should be stated by the organisation responsible for design. Examples:

(a)Provision of approved or declared design data to a production organisation to permit manufacture (AMC1 21L.A.122(c), AMC1 21L.A.272 or AMC No 1 to 21.A.133(b) and (c)).

(b)Information regarding eligibility for installation (replacement parts, repair, modification, etc.).

(c)Direct Delivery Authorisation (AMC1 21L.A.122(c), AMC1 21L.A.272 or AMC No 1 to 21.A.133(b) and (c)). If the data is in support of a change or repair, then reference to the aircraft level approval or declarations should be given (make reference to the approved supplemental type certificate, declaration, change or repair). Limitations/remarks: state any information, either directly or by reference to supporting documentation, which identifies any particular data or limitations (including specific importing requirements) needed by a production organisation to complete Block 12 of the EASA Form 1. Approval/declaration: provide reference information related to the approval or declaration of the data (EASA document / DOA privilege / registered declaration). Authorised signature: name and handwritten or electronic signature of the person who has written authority from the organisation responsible for design, as indicated in the procedures overseen by EASA.

AMC · AMC1 21L.A.5 — 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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