# Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters
> **Rule** · Final rule; request for comments. · Published 2013-01-23 · Effective 2013-02-07 · 78 FR 4762
## Document
- **Document number:** 2013-01008
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Canada Limited (Bell)
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 78 FR 4762
- **Publication date:** 2013-01-23
- **Effective date:** 2013-02-07
- **FAA docket:** Docket No. FAA-2013-0022
## Abstract

We are adopting a new airworthiness directive (AD) for Bell Model 206L, 206L-1, 206L-3, and 206L-4 helicopters. This AD requires inspecting certain hydraulic servo actuator assemblies (servo) for a loose nut, shaft, and clevis assembly, modifying or replacing the servo as necessary, and reidentifying the servo. This AD is prompted by an investigation after an accident and the determination that there was a loose connection due to improper lock washer installation. These actions are intended to detect loose or misaligned parts of the servo to prevent failure of the servo and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/01/23/2013-01008/airworthiness-directives-bell-helicopter-textron-canada-limited-bell-helicopters)
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