---
title: "21.B.109 Type-certification basis, environmental protection requirements and operational suitability data certification basis for a supplemental type certificate — Annex I, Initial Airworthiness · Avioverse"
description: "The Agency shall establish the applicable type-certification basis, the applicable environmental protection requirements and, in the case of a change…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-b-procedures-for-competent-authorities/21-b-109"
---

# 21.B.109 Type-certification basis, environmental protection requirements and operational suitability data certification basis for a supplemental type certificate

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

IR Implementing rule

## 21.B.109 Type-certification basis, environmental protection requirements and operational suitability data certification basis for a supplemental type certificate

The Agency shall establish the applicable type-certification basis, the applicable environmental protection requirements and, in the case of a change affecting the operational suitability data, the operational suitability data certification basis established in accordance with point 21.A.101 and notify them to the applicant for a supplemental type certificate.

IR · 21.B.109 — Regulation (EU) No 748/2012 · Regulation (EU) 2025/1065 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

[All rules in SECTION B — PROCEDURES FOR COMPETENT AUTHORITIES](https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-b-procedures-for-competent-authorities)

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.