# Airworthiness Directives; Bell Helicopter Textron Canada (Bell) Helicopters
> **Rule** · Final rule. · Published 2013-10-31 · Effective 2013-12-05 · 78 FR 65178
## Document
- **Document number:** 2013-25310
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Canada (Bell)
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 65178
- **Publication date:** 2013-10-31
- **Effective date:** 2013-12-05
- **FAA docket:** Docket No. FAA-2013-0526
## Abstract

We are adopting a new airworthiness directive (AD) for Bell Model 206L-4 and 407 helicopters. This AD requires replacing or reworking certain aft bearing caps. This AD was prompted by the manufacture of certain freewheel aft bearing caps without a lubrication channel to allow oil flow into the aft bearing support assembly. The actions of this AD are intended to prevent failure of the freewheel unit and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/10/31/2013-25310/airworthiness-directives-bell-helicopter-textron-canada-bell-helicopters)
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