---
title: "21.A.605 Data requirements — Annex I, Initial Airworthiness · Avioverse"
description: "The applicant shall submit to the Agency the following documents:"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements/21-a-605"
---

# 21.A.605 Data requirements

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

IR Implementing rule

## 21.A.605 Data requirements

(a) The applicant shall submit to the Agency the following documents:

1\. a certification programme for the [ETSO](https://avioverse.aero/glossary/easa/etso) authorisation, setting out the means to demonstrate compliance with point 21.A.606(b);

2\. a statement of compliance certifying that the applicant has met the requirements of this Subpart;

3\. a declaration of design and performance (DDP), stating that the applicant has demonstrated that the [article](https://avioverse.aero/glossary/easa/article) complies with the applicable ETSO in accordance with the certification programme;

4\. a copy of the technical data required in the applicable ETSO;

5\. the exposition, or a reference to the exposition, referred to in point 21.A.143 for the purpose of obtaining an appropriate production organisation approval under Subpart G or the manual, or a reference to the manual, referred to in point 21.A.125A(b) for the purpose of manufacturing under Subpart F without production organisation approval;

6\. for an APU, the handbook, or a reference to the handbook, referred to in point 21.A.243 for the purpose of obtaining an appropriate design organisation approval under Subpart J;

7\. for all other articles, the procedures, or a reference to the procedures, referred to in point 21.A.602B(b)(2);

(b) The applicant shall report to the Agency any difficulty or event encountered during the approval process that may significantly impact the ETSO authorisation.

IR · 21.A.605 — Regulation (EU) No 748/2012 · Regulation (EU) 2019/897 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

AMC Acceptable means of compliance

## AMC 21.A.605(a)(1) Certification programme

(a) For the purpose of the compliance demonstration in accordance with point 21.A.606(b), the applicant should:

(1) establish a certification programme;

(2) submit the certification programme to EASA; and

(3) keep the certification programme updated during the authorisation process.

(b) The certification programme should contain the following information:

(1) a detailed description of the relevant European technical standard order ([ETSO](https://avioverse.aero/glossary/easa/etso)) [article](https://avioverse.aero/glossary/easa/article), including all of its configurations to be certified, and the identification of ETSO and non-ETSO functions, if any;

(2) the applicable CS-ETSO, in case of different minimum performance standard (MPS) available, the selected MPS, the other requirements and any optional aspects (applicable standards, applicable requirements, choice of classes (if applicable)) as well as the expected deviations;

(3) the operating characteristics and the expected limitations;

(4) the intended use of the article and the kind of operations for which the approval is requested;

(5) the proposed means of compliance, including the list of documents and deliverables for EASA;

(6) an overview of the safety assessment for the functions supported by the article, including the main failure conditions, their classification, the associated assumptions, and architectural features supporting the safety aspects;

(7) the way in which the applicant will record the justifications of compliance; and

(8) a project schedule, including major milestones.

AMC · AMC 21.A.605(a)(1) — Regulation (EU) No 748/2012 · ED Decision 2019/018/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GM Guidance material

## GM 21.A.605(b) Reporting from the compliance demonstration process and updates to the certification programme

The applicant should report to EASA any unexpected difficulty or event encountered during the compliance demonstration which invalidates or appreciably affects the assumptions previously made, e.g.:

an increase in the severity of the consequences of a certain condition (e.g. a failure mode) of the [article](https://avioverse.aero/glossary/easa/article);

one or more significantly reduced margins on the ‘pass–fail’ criteria of the compliance demonstration;

an unusual interpretation of the results of the compliance demonstration;

a deviation from the agreed means as defined in the certification programme;

a change to the conditions set out in the AMC No 2 to 21.B.100(b); and any potential deviations discovered by the applicant.

The applicant should also evaluate whether the unexpected difficulty or event encountered will impact on the certification programme and, if necessary, they should amend the certification programme as per point 21.A.603.

GM · GM 21.A.605(b) — Regulation (EU) No 748/2012 · ED Decision 2019/018/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

[All rules in SECTION A — TECHNICAL REQUIREMENTS](https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements)

Consolidated from the EASA Easy Access Rules (revision 27 Nov 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.