# Airworthiness Directives; Saab Model SAAB 2000 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-07-22 · Effective 1999-08-06 · 64 FR 39396
## Document
- **Document number:** 99-18409
- **Category:** airworthiness
- **Manufacturer:** Saab Model SAAB 2000 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 39396
- **Publication date:** 1999-07-22
- **Effective date:** 1999-08-06
- **FAA docket:** Docket No. 98-NM-350-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB 2000 series airplanes. This action requires repetitive detailed inspections to detect looseness or gap of the press fit bushing installation of the actuator fittings of the aileron trim tabs, and eventual replacement of the bushings with new, staked bushings. Accomplishment of such replacement terminates the repetitive inspections. This action also provides for an optional temporary preventive action, which, if accomplished, would terminate the repetitive inspections until the terminating action is accomplished. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent looseness or gap of the bushings. In the event of failure of the redundant trim tab actuator, such looseness or gap of the bushings could lead to trim tab flutter and consequent structural failure of the trim tab and reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/07/22/99-18409/airworthiness-directives-saab-model-saab-2000-series-airplanes)
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