---
title: "GM No 1 to 21.A.121 Applicability – Individual product, part or appliance — Annex I, Initial Airworthiness · Avioverse"
description: "In this context, ‘demonstrating the conformity with the applicable design data of a product, part and appliance’ means that conformity with the…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements/gm-no-1-to-21-a-121-applicability-individual-product-part-or-appliance"
---

# GM No 1 to 21.A.121 Applicability – Individual product, part or appliance

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

GM Guidance material

## GM No 1 to 21.A.121 Applicability – Individual product, part or appliance

In this context, ‘demonstrating the conformity with the applicable design data of a product, part and appliance’ means that conformity with the applicable design data has to be established and shown for each and every product, part or appliance.

GM — Regulation (EU) No 748/2012 · ED Decision 2012/020/R · 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.