# Airworthiness Directives; Saab Model SAAB 2000 Series Airplanes
> **Rule** · Final rule. · Published 1998-12-18 · Effective 1999-01-22 · 63 FR 70002
## Document
- **Document number:** 98-33392
- **Category:** airworthiness
- **Manufacturer:** Saab Model SAAB 2000 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 70002
- **Publication date:** 1998-12-18
- **Effective date:** 1999-01-22
- **FAA docket:** Docket No. 98-NM-239-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB 2000 series airplanes, that requires replacement of the end-pieces of the expansion chamber attenuator (ECA) for the standby pump of the Number 2 hydraulic system with new, improved end-pieces. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent leakage of hydraulic fluid from the Number 2 hydraulic system due to failure of the end-pieces of the ECA, which could result in loss of nose wheel steering, flap operation, normal landing gear operation, and reduced redundancy in the brake and flight controls systems.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/12/18/98-33392/airworthiness-directives-saab-model-saab-2000-series-airplanes)
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