# Airworthiness Directives; Saab Model SAAB SF340A and 340B Series Airplanes
> **Rule** · Final rule. · Published 1999-11-02 · Effective 1999-12-07 · 64 FR 59113
## Document
- **Document number:** 99-28248
- **Category:** airworthiness
- **Manufacturer:** Saab Model SAAB SF340A and 340B Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 59113
- **Publication date:** 1999-11-02
- **Effective date:** 1999-12-07
- **FAA docket:** Docket No. 99-NM-199-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A and 340B series airplanes, that requires removal of certain main landing gear downlock and brake hydraulic swivel brackets and replacement with new, redesigned brackets. 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 failure of the downlock or brake swivels. Brake swivel failure could cause the loss of inboard or outboard brakes. Downlock swivel failure could cause the loss of hydraulic fluid in the main hydraulic system, as well as the loss of nose wheel steering operation, extension and retraction capability of landing gear and flaps, and operation of the propeller brake (if installed).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/11/02/99-28248/airworthiness-directives-saab-model-saab-sf340a-and-340b-series-airplanes)
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