---
title: "SUBPART A: SUBPART A – GENERAL (CS-ETSO) — rule index · Avioverse"
description: "SUBPART A, CS-ETSO. APPLICABILITY 1.1 The requirements for the issue of European Technical Standard Order (ETSO) authorisations are found in Part 21…"
url: "https://avioverse.aero/regulations/easa/cs-etso/subpart-a"
---

# SUBPART A – GENERAL

European Technical Standard Orders (CS-ETSO) · CS-ETSO · SUBPART A

1. ## [SUBPART A GENERAL](https://avioverse.aero/regulations/easa/cs-etso/subpart-a/subpart-a)

   APPLICABILITY 1.1 The requirements for the issue of European Technical Standard Order (ETSO) authorisations are found in Part 21, Section A, Subpart O.

Consolidated from the EASA Easy Access Rules (revision 1 Oct 2026, 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.

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