# Airworthiness Directives; Saab AB, Saab Aerosystems Airplanes
> **Rule** · Final rule. · Published 2012-12-10 · Effective 2013-01-14 · 77 FR 73279
## Document
- **Document number:** 2012-29169
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 73279
- **Publication date:** 2012-12-10
- **Effective date:** 2013-01-14
- **FAA docket:** Docket No. FAA-2012-0672
## Abstract

We are adopting a new airworthiness directive (AD) for certain Saab AB, Saab Aerosystems Model 340A (SAAB/SF340A) and SAAB 340B airplanes. This AD was prompted by reports of stall events during icing conditions where the natural stall warning (buffet) was not identified. This AD requires replacing the stall warning computer (SWC) with a new SWC, which provides an artificial stall warning in icing conditions, and modifying the airplane for the replacement of the SWC. We are issuing this AD to prevent natural stall events when operating in icing conditions, which, if not corrected, could result in loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/12/10/2012-29169/airworthiness-directives-saab-ab-saab-aerosystems-airplanes)
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