# Airworthiness Directives; Bell Helicopter Textron Canada Model 430 Helicopters
> **Rule** · Final rule; request for comments. · Published 1999-11-04 · Effective 1999-11-19 · 64 FR 60102
## Document
- **Document number:** 99-28652
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Canada Model 430
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 60102
- **Publication date:** 1999-11-04
- **Effective date:** 1999-11-19
- **FAA docket:** Docket No. 98-SW-50-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to Bell Helicopter Textron Canada (BHTC) Model 430 helicopters. This action requires verifying the torque on each vertical fin attachment bolt (bolt); modifying the vertical fin and tailboom and replacing the attachment hardware; and re-verifying the torque on the bolts after inspecting the fittings. This amendment is prompted by a report of a loose vertical fin, which was discovered during a post- flight inspection. The actions specified in this AD are intended to prevent loss of torque of the bolts, which could lead to fracture of the bolts, separation of the vertical fin from the helicopter, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/11/04/99-28652/airworthiness-directives-bell-helicopter-textron-canada-model-430-helicopters)
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