---
title: "CS-E 90 Prevention of Corrosion and Deterioration — CS-E · Avioverse"
description: "Each Engine component and each item of equipment must be protected from corrosion and deterioration in an approved manner."
url: "https://avioverse.aero/regulations/easa/cs-e/subpart-a/cs-e-90-prevention-of-corrosion-and-deterioration"
---

# CS-E 90 Prevention of Corrosion and Deterioration

Engines (CS-E) · CS-E · EAR revision 7 Dec 2023

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-engines-cs-e)

IR Implementing rule

## CS-E 90 Prevention of Corrosion and Deterioration

(a) Each Engine component and each item of equipment must be protected from corrosion and deterioration in an approved manner.

(b) Materials which will render the Engine inherently self-protecting against corrosion, without the use of internal and external corrosion inhibitors, must be used wherever possible.

IR — CS-E · ED Decision 2003/9/RM · CS-E Easy Access Rules · EAR revision 7 Dec 2023

[All rules in SUBPART A – GENERAL](https://avioverse.aero/regulations/easa/cs-e/subpart-a)

Consolidated from the EASA Easy Access Rules (revision 7 Dec 2023, extracted 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.