# Proposed AD FAA-2010-0042: Saab AB, Saab Aerosystems Model SAAB 340A (SAAB/SF340A) and SAAB 340B Airplanes Modified in Accordance With Supplemental Type Certificate (STC) ST00224WI-D, ST00146WI-D, or SA984GL-D

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-09-02
- Products: Saab AB, Saab Aerosystems
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: January 20, 2011, 76 FR 3564
- Comments due: March 7, 2011
- Became: [AD 2011-09-02](https://openairdocs.org/ad/2011-09-02)
- Docket: FAA-2010-0042 (https://www.regulations.gov/docket/FAA-2010-0042, where comments are filed)
- Project: 2009-NM-010-AD
- FR document: 2011-1118
- Official PDF: https://openairdocs.org/files/sha256/25/56/255683e71816314b35d0080b66308961c4014d77178f5a7ba1af46a8a9cfef12 (from https://www.govinfo.gov/content/pkg/FR-2011-01-20/pdf/2011-1118.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/01/20/2011-1118/airworthiness-directives-saab-ab-saab-aerosystems-model-saab-340a-saabsf340a-and-saab-340b-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6CECED10FFF89B028625781F004DC47D.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0042

## Summary

We are revising an earlier proposed airworthiness directive (AD) for certain Saab AB, Saab Aerosystems Model SAAB 340A (SAAB/ SF340A) and SAAB 340B airplanes. The first supplemental NPRM would have required inspecting the fuselage surface for corrosion and cracking behind the external adapter plate of the antennae installation, and repair if necessary. The first supplemental NPRM resulted from a report of a crack found behind the external adapter plate of the antennae during inspection. Similar cracking was found on two additional airplanes, and extensive corrosion was found on one airplane. This action revises the first supplemental NPRM by correcting an STC number, which would expand the applicability of the first supplemental NPRM. We are proposing this second supplemental NPRM to detect and correct corrosion and cracking behind the external adapter plate of the antennae of certain damage- tolerant structure, which could result in reduced structural integrity and consequentrapid depressurization of the airplane.

## Notices in this docket

- Jan 19, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-698, comments due Mar 5, 2010 (https://www.federalregister.gov/documents/2010/01/19/2010-698/airworthiness-directives-saab-ab-saab-aerosystems-model-saab-340a-saabsf340a-and-saab-340b-airplanes)
- Aug 23, 2010: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2010-20852, comments due Sep 17, 2010 (https://www.federalregister.gov/documents/2010/08/23/2010-20852/airworthiness-directives-saab-ab-saab-aerosystems-model-saab-340a-saabsf340a-and-saab-340b-airplanes)
- Jan 20, 2011: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2011-1118, comments due Mar 7, 2011 (https://www.federalregister.gov/documents/2011/01/20/2011-1118/airworthiness-directives-saab-ab-saab-aerosystems-model-saab-340a-saabsf340a-and-saab-340b-airplanes)

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