# Proposed AD FAA-2006-24075: Saab Model SAAB-Fairchild SF340A (SAAB/ SF340A) and SAAB 340B Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-10-05
- Products: SAAB
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 7, 2006, 71 FR 11349
- Comments due: April 6, 2006
- Became: [AD 2006-10-05](https://openairdocs.org/ad/2006-10-05)
- Docket: FAA-2006-24075 (https://www.regulations.gov/docket/FAA-2006-24075, where comments are filed)
- Project: 2005-NM-235-AD
- FR document: E6-3227
- Official PDF: https://openairdocs.org/files/sha256/65/56/6556cb1e69577ae6f03d061aa13095b42b73180a3df07e629d4a6bd3f8791ede (from https://www.govinfo.gov/content/pkg/FR-2006-03-07/pdf/E6-3227.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/03/07/E6-3227/airworthiness-directives-saab-model-saab-fairchild-sf340a-saabsf340a-and-saab-340b-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/28B2E7841AC21E268625712A005E4CEA.0001
- Page: https://openairdocs.org/proposed/FAA-2006-24075

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Saab Model SAAB-Fairchild SF340A (SAAB/SF340A) and SAAB 340B airplanes. This proposed AD would require 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 proposed AD results from a report of a cracked uplock axle caused by hydrogen embrittlement during the manufacturing process. We are proposing 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.

## Notices in this docket

- Mar 7, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-3227, comments due Apr 6, 2006 (https://www.federalregister.gov/documents/2006/03/07/E6-3227/airworthiness-directives-saab-model-saab-fairchild-sf340a-saabsf340a-and-saab-340b-airplanes)

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