# Airworthiness Directives; Bell Helicopter Textron, Inc. Model 204B, 205A, 205A-1, 205B, 210, 212, 412, 412EP, and 412CF Helicopters
> **Rule** · Final rule; request for comments. · Published 2007-11-20 · Effective 2007-12-05 · 72 FR 65224
## Document
- **Document number:** E7-22439
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 72 FR 65224
- **Publication date:** 2007-11-20
- **Effective date:** 2007-12-05
- **FAA docket:** Docket No. FAA-2007-0180
## Abstract

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2007-19-53, which was sent previously to all known U.S. owners and operators of the specified Bell Helicopter Textron, Inc. (BHTI) model helicopters by individual letters. This AD requires replacing each affected tail rotor blade (blade) with an airworthy blade with a serial number not listed in the applicability of this AD. This AD is prompted by three incidents in which blade tip weights were slung from the blades during flight causing significant vibration. The actions specified by this AD are intended to prevent loss of a blade tip weight, loss of a blade, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/11/20/E7-22439/airworthiness-directives-bell-helicopter-textron-inc-model-204b-205a-205a-1-205b-210-212-412-412ep)
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