---
title: "GM No 1 to 21.A.165(c) Obligations of the holder – Conformity of prototype models and test specimens — Annex I, Initial Airworthiness · Avioverse"
description: "21.A.33 requires determination of conformity of prototype models and test specimens to the applicable design data."
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements/gm-no-1-to-21-a-165-c-obligations-of-the-holder-conformity-of-prototype-models"
---

# GM No 1 to 21.A.165(c) Obligations of the holder – Conformity of prototype models and test specimens

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

GM Guidance material

## GM No 1 to 21.A.165(c) Obligations of the holder – Conformity of prototype models and test specimens

21.A.33 requires determination of conformity of prototype models and test specimens to the applicable design data. The EASA Form 1 may be used as a conformity certificate as part of the assistance a POA holder provides to a design approval holder/applicant.

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.