---
title: "GM No 1 to 21.A.125B(a) Uncontrolled non-compliance with applicable design data — Annex I, Initial Airworthiness · Avioverse"
description: "An uncontrolled non-compliance with applicable design data is a non-compliance:"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements/gm-no-1-to-21-a-125b-a-uncontrolled-non-compliance-with-applicable-design-data"
---

# GM No 1 to 21.A.125B(a) Uncontrolled non-compliance with applicable design data

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

GM Guidance material

## GM No 1 to 21.A.125B(a) Uncontrolled non-compliance with applicable design data

An uncontrolled non-compliance with applicable design data is a non-compliance:

a) that cannot be discovered through systematic analysis or b) that prevents identification of affected products, parts, appliances, or material.

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.