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21L.A.43 Declaration of design compliance

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

IRImplementing rule

21L.A.43Declaration of design compliance

(a)Prior to producing an aircraft or agreeing with a production organisation to produce an aircraft, a natural or legal person who designs that aircraft shall declare that its design complies with the applicable detailed technical specifications and the applicable environmental protection requirements referred to in point 21L.A.45.

(b)The declaration shall be made in a form and manner established by the Agency and shall contain at least the following information:

1.the name of the person submitting the declaration, and their address/place of business;

2.a unique reference for identifying the aircraft;

3.indication of the applicable detailed technical specifications and the applicable environmental protection requirements according to point 21L.A.45 with which the declarant declares compliance;

4.a signed statement made under the sole responsibility of the person making the declaration that the design of the aircraft, and if applicable the engine or propeller, is in compliance with the applicable detailed technical specifications and the applicable environmental protection requirements referred to in point 3, according to the compliance demonstration plan referred to in point (c) (3);

5.a signed statement made under the sole responsibility of the person making the declaration that no features or characteristics have been identified by that person that may make the aircraft unsafe or environmentally incompatible for the intended use;

6.a signed commitment that the person making the declaration will undertake the obligations referred to in point 21L.A.47;

7.if the aircraft design covered by the declaration includes an engine or propeller:

(i)a reference to the engine or propeller type certificate issued or determined in accordance with Annex I (Part 21) or issued in accordance with this Annex; or

(ii)in the case of piston engines and fixed pitch propellers, a statement that the declaration of design compliance of the aircraft covers the compliance of the engine or propeller with the applicable engine or propeller technical specifications;

8.the instructions for continued airworthiness;

9.the operating limitations;

10.the data sheet for airworthiness and, if applicable, emissions;

11.the data sheet for noise, if applicable;

12.any other conditions or limitations prescribed for the aircraft, and if applicable the engine or propeller, in the applicable detailed technical specifications and the applicable environmental protection requirements with which the declarant declares compliance.

(c)The declarant shall submit the declaration of design compliance referred to in point (b) to the Agency. Together with this declaration, the declarant shall provide to the Agency:

1.a drawing of the aircraft;

2.a detailed description of the aircraft design, including all the configurations covered by the declaration, the operating characteristics, design features and any limitations;

3.a compliance demonstration plan detailing the means by which compliance with the applicable detailed technical specifications and the applicable environmental protection requirements has been demonstrated during compliance demonstration;

4.recorded justifications of compliance obtained from the compliance activities that have been conducted according to the compliance demonstration plan;

5.where compliance is demonstrated by carrying out tests, recorded justification of the conformity of the test articles and equipment, demonstrating:

(i)for the test specimen, that:

(A)the materials and processes adequately conformed to the specifications for the design;

(B)the constituent parts of the products adequately conformed to the drawings in the design; and

(C)the manufacturing processes, construction and assembly adequately conformed to those specified in the design;

(ii)that the test and measuring equipment used for the test were adequate for the test and appropriately calibrated;

6.reports, results of inspections or tests that the declarant found necessary to determine that the aircraft, and if applicable the engine or propeller, complies with the applicable detailed technical specifications and the applicable environmental protection requirements.

IR · 21L.A.43 — 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.43(b)Declaration of design compliance

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FORM AND MANNER The request for registration should be completed as well as the declaration of design compliance which can be found on the EASA Website and sent to EASA by email or regular mail following the information provided on the EASA website. An ‘EASA project’ will be initiated by EASA in order to provide the declarant with a means to provide the required supporting documentation to EASA.

EASA Form 200 PART 2 – DECLARATION OF DESIGN COMPLIANCE

1. Request for Registration of a Declaration of Design Compliance (Part 21 Light Subpart C)
1.1 EASA Request No6XXXXX
1.2 Date of Request for Registration
1.3 ApplicabilityDesignated Type Name (this must be a unique means to identify the aircraft)
Designated Model Name(s)
Important Note: Points 1.1. and 1.2. should be left blank when the Declaration of Design Compliance (EASA Form 200 – Part 2) is submitted together with the request for registration.
2. Design Compliance
2.1 Technical Specifications used for CompliancePlease specify the technical specifications used and the amendment/issue number (e.g. CS-23 Amendment 6)
2.2 Environmental Protection Requirements if applicablePlease specify the environmental protection requirements with which compliance has been determined
2.3 Engine Details if applicableEngine has been issued with an EASA type certificatePlease provide the EASA type-certificate number and engine details
Compliance of the engine with the applicable technical specifications (as detailed in 2.1 above) has been declared within this Declaration
2.4 Propeller Details if applicablePropeller has been issued with an EASA type certificatePlease provide the EASA type-certificate number and propeller details
Compliance of the propeller with the applicable technical specifications (as detailed in 2.1 above) has been declared within this Declaration
2.5 Compliance Demonstration PlanPlease specify the reference, revision number and date of the compliance demonstration plan
2.6 Documentation in accordance with 21L.A.43 (b)Documents/information to submit for registration of the Declaration: Airworthiness Data Sheet Aircraft Flight Manual including any limitations Instructions for Continued Airworthiness Any other conditions/limitations which the declarant wishes to declare EASA Noise Record Number
Important Note: The Declaration of Design Compliance for the aircraft described in point 1.3 must be submitted along with the documentation detailed in point 21L.A.43 (b) 8, 9, 10, 11 and 12 and 21L.A.43 (c) of Annex Ib to Regulation (EU) 748/2012. The supporting documents to the Declaration of Design Compliance can be provided to the Agency using the EASA data repository and do not need to be physically attached to the Declaration of Design Compliance.
3. Declaration of Compliance
I declare that I have the legal capacity to submit this declaration to EASA and that all information provided in this Declaration form is correct and complete. I hereby declare that the design of the aircraft identified in Section 1.3 is in compliance with the applicable detailed technical specifications detailed in Section 2.1 and the applicable environmental protection requirements detailed in Section 2.2 in accordance with the compliance demonstration plan detailed in Section 2.5. (in the case that the engine is not issued with an EASA type certificate) The engine that is included within the design of the aircraft is compliant with the applicable technical specifications detailed in Section 2.1. (in the case that the propeller is not issued with an EASA type certificate) The propeller that is included within the design of the aircraft is compliant with the applicable technical specifications detailed in Section 2.1. I hereby declare that no features or characteristics have been identified that may make the aircraft unsafe or environmentally incompatible for the intended use. I hereby commit to undertake the obligations of a Declarant of a Declaration of Design Compliance as detailed in point 21L.A.47 of Annex Ib (Part 21 Light) to Regulation (EU) No 748/2012. I declare that I have provided the information required in Section 2.6, and that it is accurate and complete and indicated where it is not applicable.
Date/LocationNameSignature
Important Note: EASA cannot accept Declarations without signature. Please make sure that you sign the Declaration.
This Declaration should be sent by email to: applicant.services@easa.europa.eu

AMC · AMC1 21L.A.43(b) — 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.43(b)(10)Declaration of design compliance

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DATA SHEET FOR AIRWORTHINESS (point 21L.A.43(b)(10)) Templates for the data sheet for airworthiness for aeroplanes, sailplanes and balloons can be requested from the nominated EASA focal point for the project.

GM · GM1 21L.A.43(b)(10) — Regulation (EU) No 748/2012 · ED Decision 2023/013/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

AMCAcceptable means of compliance

AMC1 21L.A.43(b)(11)Declaration of design compliance

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DATA SHEET FOR NOISE The required noise data for the data sheet for noise (as required by point 21L.A.43(b)(11)) should be provided by the declarant using the EASA’s Part 21 Light database of declared noise levels. The declarant should submit a request to EASA for an account to access EASA’s Part 21 Light database prior to submitting the declaration of design compliance. All applicable fields in EASA’s Part 21 Light database of declared noise levels should be completed by the declarant before EASA may check the provided noise data. After a reasonability and completeness check, EASA will publish the declared data in the database. This data will be utilised to support the registration of the declaration of design compliance under point 21L.B.63. The noise data that is provided in EASA’s Part 21 Light database of declared noise levels by the declarant is under the sole responsibility of the declarant of the declaration of design compliance. The individual records in the published version of EASA’s Part 21 Light database of declared noise levels are considered ‘data sheet for noise’. It is important that the declarant uses EASA’s Part 21 Light database of declared noise levels to ensure that the declared noise levels and supporting data are made available to the competent authority for the issuance of a restricted noise certificate under point 21L.B.172. Otherwise, the competent authority may not be able to issue such a certificate.

AMC · AMC1 21L.A.43(b)(11) — 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.43(b)(4);(b)(5) Declaration of design compliance

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SIGNED STATEMENTS All compliance-demonstration activities conducted in accordance with the compliance-demonstration plan, including all the inspections and tests and all flight tests conducted in accordance with point 21L.A.44, should be completed before signing the statements required in points (4) and (5) of point 21L.A.43(b). ‘No feature or characteristic’ that may make the aircraft unsafe in point 21L.A.43(b)(5) means the following: while every effort is made to address in the applicable detailed technical specifications all the risks to product safety that may be caused by the product, experience shows that safety-related events may occur with products in service, even though compliance with the applicable detailed technical specifications is fully demonstrated. One of the reasons may be that some existing risks are not properly addressed in the applicable detailed technical specifications. Therefore, the declarant should declare that they have not identified any such features or characteristics. ‘No features or characteristics’ that may make the aircraft environmentally incompatible (point 21L.A.43(b)(5)): It is assumed that environmental compatibility is demonstrated when the aircraft complies with the applicable environmental protection requirements. Therefore, the declarant when declaring that the aircraft complies with the applicable environmental protection requirements under point 21L.A.43(b)(4), shall also declare that they have not identified any such features or characteristics.

GM · GM1 21L.A.43(b)(4) — 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.43(c)Information to be provided to the Agency

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The documents and information that are required to be provided to EASA under point 21L.A.43(c) may be provided to EASA by the declarant in advance of the submission of the declaration of design compliance. This would be advantageous for the declarant to facilitate EASA’s investigations prior to the issuance of the flight conditions for a permit to fly under point 21L.B.242(a)(2) and the first-article inspection under AMC 21L.A.47(a). If so requested, EASA may provide the declarant with an appropriate account for EASA’s document management system (for example, SEPIAC) with which the declarant may provide the documents and information listed in point 21L.A.43(c). This would also include the data related to compliance with the environmental protection requirements for noise that is required to be provided under point 21L.A.43(b)(11) which can be facilitated by requesting access to EASA’s Part 21 Light database of declared noise levels (see AMC1 21L.A.43(b)). Such data will be required to enable the competent authority to issue a restricted noise certificate under point 21L.B.172(b).

GM · GM1 21L.A.43(c) — Regulation (EU) No 748/2012 · ED Decision 2023/013/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

AMCAcceptable means of compliance

AMC1 21L.A.43(c)Declaration of design compliance

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Data and information required to be provided by the declarant should be made available to EASA in a reliable and efficient way as agreed by EASA.

AMC · AMC1 21L.A.43(c) — 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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