# Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2003-02-07 · Effective 2003-02-24 · 68 FR 6347
## Document
- **Document number:** 03-2783
- **Category:** airworthiness
- **Manufacturer:** Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 68 FR 6347
- **Publication date:** 2003-02-07
- **Effective date:** 2003-02-24
- **FAA docket:** Docket No. 2002-NM-326-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain EMBRAER Model EMB-135 and -145 series airplanes. This action requires replacement of the horizontal stabilizer control units (HSCUs) with new upgraded HSCUs, and corrective actions if necessary. This action is necessary to prevent reversal of the pilot's pitch trim command for the horizontal stabilizer, which could result in reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/02/07/03-2783/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and--145-series)
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