---
title: "CS 26.1 – 26.30: SUBPART A — GENERAL PROVISIONS (ADDITIONAL AIRWORTHINESS SPECIFICATIONS FOR OPERATIONS, Part-26) — rule index · Avioverse"
description: "CS 26.1 – 26.30, Regulation (EU) 2015/640. This CS is the standard means to show compliance of products with the requirements of Annex I (Part-26) to…"
url: "https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-a"
---

# SUBPART A — GENERAL PROVISIONS

ADDITIONAL AIRWORTHINESS SPECIFICATIONS FOR OPERATIONS · Additional Airworthiness Specifications · Regulation (EU) 2015/640 · CS 26.1 – 26.30

On this page

1. ## [CS 26.1 Purpose and scope](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-a/cs-26-1)

   This CS is the standard means to show compliance of products with the requirements of Annex I (Part-26) to Commission Regulation (EU) 2015/640.

   [GM1 26.1 JAR-26 / JAR/CS-25 / FAR-25+121 / OPS / Part-26 / CS-26 / GM-26 cross-reference table](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-a/cs-26-1#gm1-26-1)

   [GM2 26.1 Demonstration of compliance](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-a/cs-26-1#gm2-26-1)

2. ## [26.10 Competent authority](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-a/26-10)

   For the purposes of this Annex, the competent authority to which an aircraft operator needs to demonstrate compliance of its aircraft, the design of…

3. ## [26.20 Temporary inoperative equipment](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-a/26-20)

   A flight shall not be commenced when any of the aircraft’s instruments, items of equipment, or functions required by this Part are inoperative or missing…

4. ## [26.30 Demonstration of compliance](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-a/26-30)

   The Agency shall issue, in accordance with Article 76(3) of Regulation (EU) 2018/1139, certification specifications as standard means to demonstrate…

Consolidated from the EASA Easy Access Rules (revision 20 Mar 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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