---
title: "Part 21 — EASA Definition · Avioverse"
description: "Article 1, Regulation (EU) No 748/2012: “Part 21” means the requirements and procedures for the certification of aircraft and related products, parts…"
url: "https://avioverse.aero/glossary/easa/part-21"
---

# Part 21

EASA defines “Part 21” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

> “Part 21” means the requirements and procedures for the certification of aircraft and related products, parts, appliances, control and monitoring units and control and monitoring unit components, and of design and production organisations laid down in Annex I to this Regulation;

Article 1 · Initial Airworthiness and Environmental Protection · Regulation (EU) No 748/2012 · Easy Access Rules, 27 Nov 2025 revision · [Read Article 1](https://avioverse.aero/regulations/easa/initial-airworthiness/cover-regulation/general#article-1)

## Also in the aviation glossary

- Part 21 EASA EPAS

  Annex I to Regulation to Regulation (EU) 748/2012 - airworthiness and environmental certification of aircraft and related products, parts and appliances, as well as for the certification of design and production organisations

## Defined in the same article

- [article](https://avioverse.aero/glossary/easa/article)
- [complex motor-powered aircraft](https://avioverse.aero/glossary/easa/complex-motor-powered-aircraft)
- [control and monitoring unit (CMU)](https://avioverse.aero/glossary/easa/control-and-monitoring-unit)
- [control and monitoring unit component](https://avioverse.aero/glossary/easa/control-and-monitoring-unit-component)
- [ELA1 aircraft](https://avioverse.aero/glossary/easa/ela1-aircraft)
- [ELA2 aircraft](https://avioverse.aero/glossary/easa/ela2-aircraft)
- [EPA](https://avioverse.aero/glossary/easa/epa)
- [ETSO](https://avioverse.aero/glossary/easa/etso)