# Proposed AD FAA-2005-20728: Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 and -135 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-07-01
- Products: Embraer
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 30, 2005, 70 FR 16180
- Comments due: April 29, 2005
- Became: [AD 2006-07-01](https://openairdocs.org/ad/2006-07-01)
- Docket: FAA-2005-20728 (https://www.regulations.gov/docket/FAA-2005-20728, where comments are filed)
- Project: 2005-NM-003-AD
- FR document: 05-6252
- Official PDF: https://openairdocs.org/files/sha256/26/ea/26eade68fb47359156bb0f7abaa214be136dfd4e0fd57f12c32b7fe78478b327 (from https://www.govinfo.gov/content/pkg/FR-2005-03-30/pdf/05-6252.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/03/30/05-6252/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-145-and--135-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/602EDF0D79FBAE0286256FD400725402.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20728

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain EMBRAER Model EMB-145 and -135 series airplanes. This proposed AD would require replacing the horizontal stabilizer control unit (HSCU) with a modified and reidentified or new, improved HSCU. For certain airplanes, this proposed AD would also require related concurrent actions as necessary. This proposed AD is prompted by reports of loss of the pitch trim system due to a simultaneous failure of both channels of the HSCU. We are proposing this AD to prevent loss of pitch trim and reduced controllability of the airplane.

## Notices in this docket

- Mar 30, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6252, comments due Apr 29, 2005 (https://www.federalregister.gov/documents/2005/03/30/05-6252/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-145-and--135-series)

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