# Airworthiness Directives; Bell Helicopter Textron Canada Model 407 Helicopters
> **Rule** · Final rule. · Published 2000-03-01 · Effective 2000-04-05 · 65 FR 10937
## Document
- **Document number:** 00-4794
- **Category:** airworthiness
- **Manufacturer:** Bell Helicopter Textron Canada Model 407
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 10937
- **Publication date:** 2000-03-01
- **Effective date:** 2000-04-05
- **FAA docket:** Docket No. 98-SW-64-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Bell Helicopter Textron Canada (BHTC) Model 407 helicopters, that requires replacing a certain hydraulic relief valve (valve) with a different valve. This amendment is prompted by the discovery of a manufacturing defect in a valve. The actions specified by this AD are intended to prevent intermittent loss of hydraulic pressure to the flight controls and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/03/01/00-4794/airworthiness-directives-bell-helicopter-textron-canada-model-407-helicopters)
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