# Airworthiness Directives; Bell Helicopter Textron Canada Limited Model 206A, 206B, 206L, 206L-1, 206L-3, 206L-4, 222, 222B, 222U, 230, 407, 427, and 430 Helicopters
> **Rule** · Final rule; request for comments. · Published 2007-11-20 · Effective 2007-12-05 · 72 FR 65221
## Document
- **Document number:** E7-22416
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 72 FR 65221
- **Publication date:** 2007-11-20
- **Effective date:** 2007-12-05
- **FAA docket:** Docket No. FAA-2007-0179
## Abstract

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2007-19-52, which was sent previously to all known U.S. owners and operators of the specified Bell Helicopter Textron Canada Limited (BHTC) 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 Rotor Blades, Inc. (RBI), attachment to the BHTC Alert Service Bulletin (ASB), listed in the applicability section of this AD. This amendment is prompted by three incidents in which blade tip weights were slung from blades during flight causing significant vibration. The actions specified 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/E7-22416/airworthiness-directives-bell-helicopter-textron-canada-limited-model-206a-206b-206l-206l-1-206l-3)
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