# Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 Airplanes and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes
> **Rule** · Final rule. · Published 2006-03-27 · Effective 2006-05-01 · 71 FR 15012
## Document
- **Document number:** 06-2853
- **Category:** airworthiness
- **Manufacturer:** Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 15012
- **Publication date:** 2006-03-27
- **Effective date:** 2006-05-01
- **FAA docket:** Docket No. FAA-2005-20728
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain EMBRAER Model EMB-135 airplanes and Model EMB-145, -145ER, - 145MR, -145LR, -145XR, -145MP, and -145EP airplanes. This AD requires replacing the horizontal stabilizer control unit (HSCU) with a modified and reidentified or new, improved HSCU. For certain airplanes, this AD also requires related concurrent actions as necessary. This 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 issuing this AD to prevent loss of pitch trim and reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/03/27/06-2853/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-airplanes-and)
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