---
title: "AMC No 1 to 21.A.129(c) Obligations of the manufacturer – 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/amc-no-1-to-21-a-129-c-obligations-of-the-manufacturer-conformity-of-prototype"
---

# AMC No 1 to 21.A.129(c) Obligations of the manufacturer – Conformity of prototype models and test specimens

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

AMC Acceptable means of compliance

## AMC No 1 to 21.A.129(c) Obligations of the manufacturer – 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. For a complete aircraft a ‘conformity document’, that has to be validated by the competent authority, should be provided as part of the assistance to the design approval applicant. For products other than a complete aircraft, and for parts and appliances, an EASA Form 1 validated by the competent authority may be used as a conformity document as part of the assistance to the design approval applicant.

AMC — 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.