---
title: "21L.A.255 Identification of parts — Annex Ib, Initial Airworthiness · Avioverse"
description: "Any natural or legal person who produces parts under Subpart G of Section A of Annex I (Part 21) or under Subpart G or R of this Annex for a product for…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-a-technical-requirements/21l-a-255"
---

# 21L.A.255 Identification of parts

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

IR Implementing rule

## 21L.A.255 Identification of parts

Any natural or legal person who produces parts under Subpart G of Section A of Annex I ([Part 21](https://avioverse.aero/glossary/easa/part-21)) or under Subpart G or R of this Annex for a product for which the design has been approved or declared in accordance with this Annex shall permanently and legibly mark that part as specified in accordance with point 21L.A.252.

IR · 21L.A.255 — Regulation (EU) No 748/2012 · Regulation (EU) 2022/1358 · 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.