---
title: "AMC E 520(a) Strength - High Cycle Fatigue — CS-E · Avioverse"
description: "In order to minimise the adverse consequences of Failures due to unpredicted high cycle fatigue it is recommended that, normally, the relative fatigue…"
url: "https://avioverse.aero/regulations/easa/cs-e/subpart-d/amc-e-520-a-strength-high-cycle-fatigue"
---

# AMC E 520(a) Strength - High Cycle Fatigue

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

AMC Acceptable means of compliance

## AMC E 520(a) Strength - High Cycle Fatigue

In order to minimise the adverse consequences of Failures due to unpredicted high cycle fatigue it is recommended that, normally, the relative fatigue strengths of the blade/disc are graded such that they lie in the ascending order: blade form, blade root, disc blade attachment, disc rim.

\[Amdt. No.: E/1]

AMC — CS-E · ED Decision 2007/015/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.