# Airworthiness Directives; Saab Model SAAB-Fairchild SF340A (SAAB/SF340A) and SAAB 340B Airplanes
> **Rule** · Final rule. · Published 2006-05-12 · Effective 2006-06-16 · 71 FR 27598
## Document
- **Document number:** 06-4309
- **Category:** airworthiness
- **Manufacturer:** Saab Model SAAB-Fairchild SF340A (SAAB/SF340A) and SAAB 340B
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 27598
- **Publication date:** 2006-05-12
- **Effective date:** 2006-06-16
- **FAA docket:** Docket No. FAA-2006-24075
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Saab Model SAAB-Fairchild SF340A (SAAB/SF340A) and SAAB 340B airplanes. This AD requires a one-time inspection to see if a faulty uplock axle for the shock strut of the main landing gear (MLG) is installed, and replacing the uplock axle with a new uplock axle if necessary. This AD results from a report of a cracked uplock axle caused by hydrogen embrittlement during the manufacturing process. We are issuing this AD to prevent failure of the uplock mechanism, which, combined with a loss of hydraulic pressure, could result in an uncommanded extension of the MLG.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/05/12/06-4309/airworthiness-directives-saab-model-saab-fairchild-sf340a-saabsf340a-and-saab-340b-airplanes)
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