# Airworthiness Directives; Agusta S.p.A. Model A109E Helicopters
> **Rule** · Final rule; request for comments. · Published 2000-12-29 · Effective 2001-01-16 · 65 FR 82903
## Document
- **Document number:** 00-33335
- **Category:** airworthiness
- **Manufacturer:** Agusta S.p.A. Model A109E
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 65 FR 82903
- **Publication date:** 2000-12-29
- **Effective date:** 2001-01-16
- **FAA docket:** Docket No. 2000-SW-58-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model A109E helicopters. This action requires replacing certain tail rotor blades with airworthy tail rotor blades. This amendment is prompted by a tail rotor blade (blade) failure that caused a high vibration level in the helicopter. Investigation revealed that the failure was due to a change in the manufacturing process for an identified production lot of blades. This condition, if not corrected, could result in a failure of a blade and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/12/29/00-33335/airworthiness-directives-agusta-spa-model-a109e-helicopters)
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