# Section 4: Notifying authorities and notified bodies

> EU AI Act (2024/1689)
> Chapter 3 High-Risk AI Systems
> Source: https://en.ai-act.io/chapter/notifying-authorities-and-notified-bodies

## Articles

- [Article 28: Notifying authorities](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/notifying-authorities.md)
- [Article 29: Application of a conformity assessment body for notification](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/application-of-a-conformity-assessment-body-for-notification.md)
- [Article 30: Notification procedure](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/notification-procedure.md)
- [Article 31: Requirements relating to notified bodies](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/requirements-relating-to-notified-bodies.md)
- [Article 32: Presumption of conformity with requirements relating to notified bodies](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/presumption-of-conformity-with-requirements-relating-to-notified-bodies.md)
- [Article 33: Subsidiaries of notified bodies and subcontracting](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/subsidiaries-of-notified-bodies-and-subcontracting.md)
- [Article 34: Operational obligations of notified bodies](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/operational-obligations-of-notified-bodies.md)
- [Article 35: Identification numbers and lists of notified bodies ](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/identification-numbers-and-lists-of-notified-bodies.md)
- [Article 36: Changes to notifications](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/changes-to-notifications.md)
- [Article 37: Challenge to the competence of notified bodies](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/challenge-to-the-competence-of-notified-bodies.md)
- [Article 38: Coordination of notified bodies](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/coordination-of-notified-bodies.md)
- [Article 39: Conformity assessment bodies of third countries](https://en.ai-act.io/article/high-risk-ai-systems/notifying-authorities-and-notified-bodies/conformity-assessment-bodies-of-third-countries.md)