---
title: "Article 4 Continued validity of supplemental type-certificates — Cover regulation, Initial Airworthiness · Avioverse"
description: "With regard to supplemental type-certificates issued by a Member State under JAA procedures or applicable national procedures and with regard to changes…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/cover-regulation/general/article-4"
---

# Article 4 Continued validity of supplemental type-certificates

Cover regulation · Regulation (EU) No 748/2012 · EAR revision 27 Nov 2025

IR Implementing rule

## Article 4 Continued validity of supplemental type-certificates

1\. With regard to supplemental type-certificates issued by a Member State under [JAA](https://avioverse.aero/glossary/easa/jaa) procedures or applicable national procedures and with regard to changes to products proposed by persons other than the type-certificate holder of the product, which were approved by a Member State under applicable national procedures, if the supplemental type-certificate, or change, was valid on 28 September 2003, the supplemental type-certificate, or change shall be deemed to have been issued under this Regulation.

2\. With regard to supplemental type-certificates for which a certification process was being carried out by a Member State on 28 September 2003 under applicable JAA supplemental type-certificate procedures and with regard to major changes to products, proposed by persons other than the type-certificate holder of the product, for which a certification process was being carried out by a Member State on 28 September 2003 under applicable national procedures, the following shall apply:

(a) if a certification process was being carried out by several Member States, the most advanced project shall be used as the reference;

(b) point 21.A.113 (a) and (b) of Annex I ([Part 21](https://avioverse.aero/glossary/easa/part-21)) shall not apply;

(c) the applicable certification basis shall be that established by the JAA or, where applicable, the Member State at the date of application for the supplemental type-certificate or the major change approval;

(d) the compliance findings made under JAA or Member State procedures shall be deemed to have been made by the Agency for the purpose of complying with point 21.A.115(a) of Annex I (Part 21).

IR · Article 4 — Regulation (EU) No 748/2012 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

[All rules in General provisions](https://avioverse.aero/regulations/easa/initial-airworthiness/cover-regulation/general)

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.