---
title: "21.A.431A Scope — Annex I, Initial Airworthiness · Avioverse"
description: "This Subpart establishes the procedure for the approval of a repair design of a product, part, appliance, CMU or CMU component, and establishes the…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-i/section-a-technical-requirements/21-a-431a"
---

# 21.A.431A Scope

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

IR Implementing rule

## 21.A.431A Scope

(a) This Subpart establishes the procedure for the approval of a repair design of a product, part, appliance, CMU or CMU component, and establishes the rights and obligations of the applicant for, and holder of, that approval.

(b) This Subpart defines standard repairs that are not subject to an approval process under this Subpart.

(c) A “repair” means the elimination of damage and/or restoration to an airworthy condition following the initial release to service by the manufacturer of any product, part, appliance, CMU or CMU component.

(d) The elimination of damage by replacement of parts, appliances or CMU components without the necessity for design activity shall be considered a maintenance task and shall, therefore, require no approval under this Annex.

(e) A repair to an [ETSO](https://avioverse.aero/glossary/easa/etso) [article](https://avioverse.aero/glossary/easa/article) other than an Auxiliary Power Unit (APU) shall be treated as a change to the ETSO design and shall be processed in accordance with point 21.A.611.

(f) In this Subpart, the references to type-certificates include type-certificates and restricted type-certificates.

IR · 21.A.431A — Regulation (EU) No 748/2012 · Regulation (EU) 2024/1108 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GM Guidance material

## GM 21.A.431A Scope

Manuals and other instructions for continued airworthiness (such as the Manufacturers Structural Repair Manual, Maintenance Manuals and Engine Manuals provided by the holder of the type-certificate, supplemental type-certificate, or APU [ETSO](https://avioverse.aero/glossary/easa/etso) authorisation as applicable) for operators, contain useful information for the development and approval of repairs.

When these data are explicitly identified as approved, they may be used by operators without further approval to cope with anticipated in-service problems arising from normal usage provided that they are used strictly for the purpose for which they have been developed.

Approved data is data which is approved either by the Agency, or by an appropriately approved design organisation.

When specific repair data is approved outside of the Community, conditions for acceptance may be defined in the bilateral arrangements between the Community and the competent authority of a third country. In the absence of such arrangement, the repair data shall follow the approval route as if it was designed and approved within the Community.

GM · GM 21.A.431A — Regulation (EU) No 748/2012 · ED Decision 2019/018/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GM Guidance material

## GM 21.A.431A(e) Repairs to European technical standard order (ETSO) articles other than auxiliary power units (APUs)

A repair to an [ETSO](https://avioverse.aero/glossary/easa/etso) [article](https://avioverse.aero/glossary/easa/article) other than an APU can be either be seen:

1\. Under 21.A.611 in the context of an ETSO authorisation, i.e., when an article as such is specifically approved under Subpart O, with dedicated rules that give specific rights and obligations to the designer of the article, irrespective of any product type design or change to the type design. For a repair to such an article, irrespective of installation on any aircraft, Subpart O, and 21.A.611 in particular, should be followed; or

2\. When an airline or a maintenance organisation is designing a new repair (based on data not published in the TC holder or Original Equipment Manufacturer documentation) on an article installed on an aircraft, such a repair can be considered as a repair to the product in which the article is installed, not to the article taken in isolation. Therefore Subpart M can be used for the approval of this repair, that will be identified as ‘repair to product x affecting article y’, but not ‘repair to article y’.

GM · GM 21.A.431A(e) — Regulation (EU) No 748/2012 · ED Decision 2019/018/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.