# Airworthiness Directives; Turbomeca Arriel 2B and 2B1 Turboshaft Engines
> **Rule** · Final rule; request for comments. · Published 2005-12-13 · Effective 2005-12-28 · 70 FR 73579
## Document
- **Document number:** 05-23831
- **Category:** airworthiness
- **Manufacturer:** Turbomeca Arriel 2B and 2B1 Turboshaft
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 73579
- **Publication date:** 2005-12-13
- **Effective date:** 2005-12-28
- **FAA docket:** Docket No. FAA-2005-22928
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Turbomeca Arriel 2B and 2B1 turboshaft engines without modification TU22 incorporated. This AD requires initial and repetitive visual checks of the free turbine shield for cracks. This AD results from reports of several free turbine shields found with large circumferential cracks. We are issuing this AD to prevent failure of the free turbine shield, leading to engine misalignment, in-flight engine shutdown, emergency autorotation landing, or accident.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/12/13/05-23831/airworthiness-directives-turbomeca-arriel-2b-and-2b1-turboshaft-engines)
---
*AI Analytics · CC0 1.0*