# Airworthiness Directives; Bell Helicopter Textron Canada Helicopters
> **Rule** · Final rule. · Published 2015-03-16 · Effective 2015-04-20 · 80 FR 13481
## Document
- **Document number:** 2015-05571
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Canada
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 13481
- **Publication date:** 2015-03-16
- **Effective date:** 2015-04-20
- **FAA docket:** Docket No. FAA-2014-0070
## Abstract

We are adopting a new airworthiness directive (AD) for Bell Helicopter Textron Canada (BHTC) Model 407 helicopters. This AD requires inspecting the aft fuselage upper skin (upper skin) for a crack and the upper left longeron assembly (longeron assembly) for a crack, corrosion, or defect. This AD requires replacing or repairing a part or section, depending on the inspection's outcome. This AD was prompted by reports of cracks in the upper left-hand longeron. This AD's actions are intended to prevent failure of the longeron assembly or the upper skin, which could lead to a structural failure and loss of helicopter control.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/03/16/2015-05571/airworthiness-directives-bell-helicopter-textron-canada-helicopters)
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