# Airworthiness Directives; Bell Helicopter Textron Canada Model 206L-4 Helicopters
> **Rule** · Final rule. · Published 2001-10-03 · Effective 2001-11-07 · 66 FR 50304
## Document
- **Document number:** 01-24622
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Canada Model 206L-4
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 50304
- **Publication date:** 2001-10-03
- **Effective date:** 2001-11-07
- **FAA docket:** Docket No. 2000-SW-37-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) for Bell Helicopter Textron Canada (BHTC) Model 206L-4 helicopters that requires installing a high altitude tail rotor static stop yield indicator (indicator) to allow operators to detect excessive bending loads sustained by the tail rotor yoke. A preflight check of the indicator is also required. This amendment is prompted by a determination that a tail rotor yoke with a high altitude rotor system is susceptible to a static and dynamic overload. Static overload could occur after the tail rotor yoke sustains an excessive bending load due to a strike from a ground vehicle. Dynamic overload could occur as a result of a hard landing. The actions specified by this AD are intended to prevent failure of the tail rotor yoke in flight and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/10/03/01-24622/airworthiness-directives-bell-helicopter-textron-canada-model-206l-4-helicopters)
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