---
title: "21L.A.26 Type design — Annex Ib, Initial Airworthiness · Avioverse"
description: "The applicant for a type certificate shall define the product type design to enable its unique and unambiguous identification, consisting of:"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-a-technical-requirements/21l-a-26"
---

# 21L.A.26 Type design

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

IR Implementing rule

## 21L.A.26 Type design

The applicant for a type certificate shall define the product type design to enable its unique and unambiguous identification, consisting of:

(a) 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;

(b) information on the materials and processes used;

(c) information on the methods of manufacture and assembly;

(d) any airworthiness limitations;

(e) the environmental compatibility requirements; and

(f) 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.26 — 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.