---
title: "21L.A.46 Aircraft design data — Annex Ib, Initial Airworthiness · Avioverse"
description: "The declarant shall clearly define the aircraft design to enable its unique and unambiguous identification."
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-a-technical-requirements/21l-a-46"
---

# 21L.A.46 Aircraft design data

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

IR Implementing rule

## 21L.A.46 Aircraft design data

(a) The declarant shall clearly define the aircraft design to enable its unique and unambiguous identification.

(b) The aircraft design data that is used by the declarant to uniquely define the aircraft design shall include:

1\. the drawings and specifications and a listing of those drawings and specifications that are necessary to define the configuration and the design features of the product;

2\. information on the materials and processes used;

3\. information on the methods of manufacture and assembly;

4\. any airworthiness limitations;

5\. any environmental compatibility requirements; and

6\. any other data allowing by comparison the determination of the airworthiness and, if relevant, the environmental compatibility of later products of the same type.

IR · 21L.A.46 — 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.