# Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 and Model 427 Helicopters
> **Rule** · Final rule; request for comments. · Published 2009-12-11 · Effective 2009-12-28 · 74 FR 65684
## Document
- **Document number:** E9-29427
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Canada (BHTC) Model 407 and Model 427
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 74 FR 65684
- **Publication date:** 2009-12-11
- **Effective date:** 2009-12-28
- **FAA docket:** Docket No. FAA-2009-1123
## Abstract

We are adopting a new airworthiness directive (AD) for the BHTC Model 407 and Model 427 helicopters. This AD results from mandatory continuing airworthiness information (MCAI) ADs issued by the aviation authority of Canada. The MCAI ADs state that some hydraulic pump driveshaft assemblies may have been delivered with a missing internal plug or fastening rivet. This condition, if not corrected, could result in a loss of hydraulic pressure and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/12/11/E9-29427/airworthiness-directives-bell-helicopter-textron-canada-bhtc-model-407-and-model-427-helicopters)
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