---
title: "AMC E 520(d) Strength – Local Failures — CS-E · Avioverse"
description: "Local Failures of the Engine casing may include localised cracking."
url: "https://avioverse.aero/regulations/easa/cs-e/subpart-d/amc-e-520-d-strength-local-failures"
---

# AMC E 520(d) Strength – Local Failures

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

AMC Acceptable means of compliance

## AMC E 520(d) Strength – Local Failures

Local Failures of the Engine casing may include localised cracking. For any casing design that allows for residual crack growth:

(a) it should be demonstrated that the condition of the casing, including the maximum predicted crack size, will not lead to a Hazardous Engine Effect;

(b) if the Failure of the casing, for instance as the result of ultimate crack growth, could result in a Hazardous Engine Effect, then the part should be classified as a Critical Part in accordance with CS-E 510(a)(2) and be in compliance with the Integrity Specifications of CS-E 515.

\[Amdt No: E/5]

AMC — CS-E · ED Decision 2018/014/R · CS-E Easy Access Rules · EAR revision 7 Dec 2023

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

Consolidated from the EASA Easy Access Rules (revision 7 Dec 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.