---
title: "21.A.121 Scope — Annex I, Initial Airworthiness · Avioverse"
description: "This Subpart establishes the procedure for demonstrating conformity with the applicable design data of a product, part, appliance, CMU and CMU component…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements/21-a-121"
---

# 21.A.121 Scope

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

IR Implementing rule

## 21.A.121 Scope

(a) This Subpart establishes the procedure for demonstrating conformity with the applicable design data of a product, part, appliance, CMU and CMU component that are intended to be manufactured without a production organisation approval under Subpart G.

(b) This Subpart establishes the obligations of the manufacturer of a product, part, appliance CMU and CMU component manufactured under this Subpart.

IR · 21.A.121 — Regulation (EU) No 748/2012 · Regulation (EU) 2024/1108 · 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.