---
title: "CS 25.609 Protection of structure — CS-25 · Avioverse"
description: "(See AMC 25.609) Each part of the structure must- (a) Be suitably protected against deterioration or loss of strength in service due to any cause…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-d/cs-25-609"
---

# CS 25.609 Protection of structure

Large Aeroplanes (CS-25) · CS-25 · EAR revision 26 Jan 2023

IR Implementing rule

## CS 25.609 Protection of structure

(See AMC 25.609)

Each part of the structure must-

(a) Be suitably protected against deterioration or loss of strength in service due to any cause, including –

(1) Weathering;

(2) Corrosion; and

(3) Abrasion; and

(b) Have provisions for ventilation and drainage where necessary for protection.

\[Amdt 25/18]

IR · CS 25.609 — CS-25 · ED Decision 2016/010/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.609 Protection of structure

The comprehensive and detailed material standards accepted in the member states will be accepted as satisfying the requirement of CS 25.609.

AMC · AMC 25.609 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART D – DESIGN AND CONSTRUCTION](https://avioverse.aero/regulations/easa/cs-25/subpart-d)

Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, 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.