---
title: "ML.A.304 Data for modifications and repairs — Part-ML · Avioverse"
description: "A person or organisation repairing an aircraft or a component shall assess any damage."
url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-ml/section-a-technical-requirements/ml-a-304"
---

# ML.A.304 Data for modifications and repairs

Annex Vb (Part-ML) · Regulation (EU) No 1321/2014 · EAR revision 2 Sep 2025

IR Implementing rule

## ML.A.304 Data for modifications and repairs

A person or [organisation](https://avioverse.aero/glossary/easa/organisation) repairing an [aircraft](https://avioverse.aero/glossary/easa/aircraft) or a [component](https://avioverse.aero/glossary/easa/component) shall assess any damage. Modifications and repairs shall be carried out using the applicable data, that is, as appropriate:

(a) approved by the Agency;

(b) approved by a design organisation complying with Annex I (Part 21) to Regulation (EU) No 748/2012;

(c) contained in the requirements referred to in point 21.A.90B or point 21.A.431B of Annex I (Part 21) to Regulation (EU) No 748/2012;

(d) contained in the requirements referred to in point 21L.A.62, 21L.A.102, 21L.A.202 or 21L.A.222 of Annex Ib (Part 21 Light) to Regulation (EU) No 748/2012;

(e) declared by a declarant complying with Annex Ib (Part 21 Light) to Regulation (EU) No 748/2012.

IR · ML.A.304 — Regulation (EU) No 1321/2014 · Regulation (EU) 2022/1360 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025

[All rules in SECTION A — TECHNICAL REQUIREMENTS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-ml/section-a-technical-requirements)

Consolidated from the EASA Easy Access Rules (revision 2 Sep 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.