---
title: "21L.A.177 Obligations of the declared design organisation — Annex Ib, Initial Airworthiness · Avioverse"
description: "A declared design organisation shall: work in accordance with clearly defined procedures, practices and processes;"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-a-technical-requirements/21l-a-177"
---

# 21L.A.177 Obligations of the declared design organisation

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

IR Implementing rule

## 21L.A.177 Obligations of the declared design organisation

A declared design organisation shall:

(a) work in accordance with clearly defined procedures, practices and processes;

(b) if the declared design organisation intends to conduct flight testing, maintain and keep updated an operations manual that provides a description of the organisation’s policies and processes for flight testing and make this manual available to the Agency upon request;

(c) determine whether the designs of products, including changes and repairs, do not have any unsafe features and comply with the applicable type-certification basis, and with the applicable environmental protection requirements, and provide the Agency with statements/documentation confirming this;

(d) provide the Agency with information or instructions relating to continued airworthiness actions;

(e) comply with the requirements in Subpart A of this Annex applicable to declared design organisations.

IR · 21L.A.177 — Regulation (EU) No 748/2012 · Regulation (EU) 2022/1358 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GM Guidance material

## GM1 21L.A.177(e) Obligations of the declared design organisation

APPLICABLE SUBPART A REQUIREMENTS

The following requirements in Subpart A are applicable to declared design organisations:

points 21L.A.3(a), (c), (d), (e) and (f) Reporting system point 21L.A.4 Airworthiness directives point 21L.A.5 Collaboration between design and production point 21L.A.6(a) Marking points 21L.A.7(a), (c) and (d) Record-keeping point 21L.A.8 Manuals point 21L.A.9 Instructions for continued airworthiness point 21L.A.10 Access and investigation point 21L.A.11 Findings and observations point 21L.A.12 Means of compliance

GM · GM1 21L.A.177(e) — 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](https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/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.