---
title: "CS 26.306(a) and (d) Fatigue-critical baseline structure — ADDITIONAL AIRWORTHINESS SPECIFICATIONS FOR OPERATIONS, Part-26 · Avioverse"
description: "Compliance with points 26.306(a) and 26.306(d) of Part-26 is demonstrated when a list of the FCBSs exists that has been identified in compliance with AMC…"
url: "https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-b/cs-26-306-a"
---

# CS 26.306(a) and (d) Fatigue-critical baseline structure

ADDITIONAL AIRWORTHINESS SPECIFICATIONS FOR OPERATIONS · Regulation (EU) 2015/640 · EAR revision 20 Mar 2026

IR Implementing rule

## CS 26.306(a) and (d) Fatigue-critical baseline structure

Compliance with points 26.306(a) and 26.306(d) of Part-26 is demonstrated when a list of the FCBSs exists that has been identified in compliance with AMC 25.571 Appendix 5 or AMC 20-20A Appendix 3 paragraph 3.3, and which clearly describes the location and the extent of the FCBSs.

\[Issue: 26/3]

IR · CS 26.306(a) — Regulation (EU) 2015/640 · ED Decision 2020/023/R · Part-26 Easy Access Rules · EAR revision 20 Mar 2026

[All rules in SUBPART B — AEROPLANES](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-b)

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.