---
title: "21L.B.183 Oversight — Annex Ib, Initial Airworthiness · Avioverse"
description: "The Agency shall oversee the declared design organisation in order to verify the continuous compliance of the organisation with the applicable…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-b-procedures-for-competent-authorities/21l-b-183"
---

# 21L.B.183 Oversight

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

IR Implementing rule

## 21L.B.183 Oversight

(a) The Agency shall oversee the declared design organisation in order to verify the continuous compliance of the organisation with the applicable requirements of Section A.

(b) The oversight shall include a product critical design review or physical inspection, and a first [article](https://avioverse.aero/glossary/easa/article) inspection of every new design of the declared design organisation.

IR · 21L.B.183 — Regulation (EU) No 748/2012 · Regulation (EU) 2022/1358 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GM Guidance material

## GM1 21L.B.183(b) Oversight

CRITICAL DESIGN REVIEW, PHYSICAL INSPECTION AND FIRST-[ARTICLE](https://avioverse.aero/glossary/easa/article) INSPECTION

The oversight of a declared design organisation should be built around the product design and the investigations performed by EASA during the certification or the registration of a declaration of design compliance.

These investigations are performed as follows:

(a) for the certification of design compliance:

(1) a critical design review is performed, as applicable, before the approval of the flight conditions (see point 21L.B.242(a)(1) and (a)(3));

(2) a physical inspection is performed, as applicable, before the approval of the flight conditions (see point 21L.B.242(a)(1) and (a)(3)); and

(3) a physical inspection of the first article (first-article inspection) is performed, as applicable, after receiving the declaration of compliance and before the issuance of the respective product design certificate or approval (see points 21L.B.46(c), 21L.B.83(c), 21L.B.102(c) and 21L.B.203(c));

(b) for a declaration of design compliance:

(1) a physical inspection is performed, as applicable, before the approval of the flight conditions (see point 21L.B.242(a)(2) and (a)(4)); and

(2) a physical inspection of the first article (first-article inspection) is performed, as applicable, after receiving the declaration of design compliance and before the registration of the respective declaration (see points 21.B.62(b), 21.B.121(b) and 21L.B.221(b)).

Note: The physical inspections mentioned above are:

for a certified product: compliance inspections during which EASA verifies that the product is compliant with the applicable type-certification basis and the applicable environmental protection requirements;

for a declared aircraft: safety inspections during which EASA ensures that the aircraft is capable of safe flight and environmentally compatible; these physical inspections may include ground, functional and flight tests, as relevant.

For the contents and methodology to perform critical design reviews, physical inspections and first-article inspections, refer to AMC2 21L.B.46(c), AMC1 21L.B.62(b), AMC1 21L.B.241(a)(1) and point 21L.B.242(a)(1), and AMC 21L.B.241(a)(2) and point 21L.B.242(a)(2).

GM · GM1 21L.B.183(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 B - PROCEDURES FOR COMPETENT AUTHORITIES](https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-b-procedures-for-competent-authorities)

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.