# Airworthiness Directives; Bell Helicopter Textron, Inc. Model 205A, 205A-1, and 204B Helicopters
> **Rule** · Final rule; request for comments. · Published 1995-05-11 · Effective 1995-05-26 · 60 FR 25122
## Document
- **Document number:** 95-11541
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 60 FR 25122
- **Publication date:** 1995-05-11
- **Effective date:** 1995-05-26
- **FAA docket:** Docket No. 95-SW-02-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to Bell Helicopter Textron, Inc. (BHTI) Model 205A, 205A- 1, and 204B helicopters. This action requires verification that the tail rotor control system is rigged in accordance with the applicable maintenance manual; a fluorescent penetrant inspection for cracks at the roots of the gear teeth on the pinion and gear of affected 42- degree tail rotor drive gearbox assemblies (42-degree gearboxes) and replacement of the 42-degree gearbox pinion or gear if cracks are found, and creation of a component history card to track the numbers of torque events. A torque event is defined as a takeoff or a lift (internal or external). This amendment is prompted by 14 accidents reported in the United States and Canada related to failure of the 42- degree gearbox. The actions specified in this AD are intended to prevent failure of the 42-degree gearbox, loss of tail rotor control, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1995/05/11/95-11541/airworthiness-directives-bell-helicopter-textron-inc-model-205a-205a-1-and-204b-helicopters)
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