---
title: "Modification — EASA Definition · Avioverse"
description: "Article 2, Regulation (EU) No 1178/2011: ‘Modification’ means, in the context of FSTDs, a change to an FSTD;"
url: "https://avioverse.aero/glossary/easa/modification"
---

# Modification

EASA defines “Modification” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

> ‘Modification’ means, in the context of FSTDs, a change to an FSTD;
>
> (38) ‘Validation’, in the context of FSTDs, means the process of assessing the capabilities of an FSTD for training, testing and checking;

Article 2 · Aircrew · Regulation (EU) No 1178/2011 · Easy Access Rules, 16 Oct 2026 revision · [Read Article 2](https://avioverse.aero/regulations/easa/aircrew/cover-regulation/powers-and-recitals#article-2)

## Defined in the same article

- [acceptable means of compliance (AMC)](https://avioverse.aero/glossary/easa/acceptable-means-of-compliance)
- [Aircrew](https://avioverse.aero/glossary/easa/aircrew)
- [alternative means of compliance](https://avioverse.aero/glossary/easa/alternative-means-of-compliance)
- [approved training organisation (ATO)](https://avioverse.aero/glossary/easa/approved-training-organisation)
- [ARO.RAMP](https://avioverse.aero/glossary/easa/aroramp)
- [Assigned FSTD capability signature (assigned FCS)](https://avioverse.aero/glossary/easa/assigned-fstd-capability-signature)
- [Automatically validated](https://avioverse.aero/glossary/easa/automatically-validated)
- [basic instrument training device (BITD)](https://avioverse.aero/glossary/easa/basic-instrument-training-device)