# Airworthiness Directives; Saab Model SAAB 2000 Series Airplanes
> **Rule** · Final rule. · Published 2004-02-18 · Effective 2004-03-24 · 69 FR 7563
## Document
- **Document number:** 04-3349
- **Category:** airworthiness
- **Manufacturer:** Saab Model SAAB 2000 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 7563
- **Publication date:** 2004-02-18
- **Effective date:** 2004-03-24
- **FAA docket:** Docket No. 2001-NM-365-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB 2000 series airplanes, that requires replacing the dual shuttle valve in the number 2 hydraulic system with a new, improved valve. This action is necessary to prevent failure of the dual shuttle valve in the number 2 hydraulic system, with reduced maximum elevator rate on the left side, which could result in pilot-induced pitch oscillation and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/02/18/04-3349/airworthiness-directives-saab-model-saab-2000-series-airplanes)
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