---
title: "21.A.117 Changes to that part of a product covered by a supplemental type-certificate — Annex I, Initial Airworthiness · Avioverse"
description: "Minor changes to that part of a product, an UAS or a CMU that is covered by a supplemental type-certificate shall be classified and approved in…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements/21-a-117"
---

# 21.A.117 Changes to that part of a product covered by a supplemental type-certificate

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

IR Implementing rule

## 21.A.117 Changes to that part of a product covered by a supplemental type-certificate

(a) Minor changes to that part of a product, an UAS or a CMU that is covered by a supplemental type-certificate shall be classified and approved in accordance with Subpart D.

(b) Each major change to that part of a product, an UAS or a CMU that is covered by a supplemental type- certificate shall be approved as a separate supplemental type-certificate in accordance with this Subpart.

(c) By way of derogation from point (b), a major change to that part of a product, an UAS or a CMU that is covered by a supplemental type-certificate submitted by the supplemental type-certificate holder itself may be approved as a change to the existing supplemental type-certificate.

IR · 21.A.117 — Regulation (EU) No 748/2012 · Regulation (EU) 2024/1108 · 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-i/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.