# Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120 Series Airplanes
> **Rule** · Final rule. · Published 2004-07-02 · Effective 2004-08-06 · 69 FR 40309
## Document
- **Document number:** 04-14571
- **Category:** airworthiness
- **Manufacturer:** Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 40309
- **Publication date:** 2004-07-02
- **Effective date:** 2004-08-06
- **FAA docket:** Docket No. 2003-NM-105-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all EMBRAER Model EMB-120 series airplanes, that requires revising the Airplane Flight Manual to ensure that the propeller synchronizer switch is "OFF" after engine start and before takeoff and landing. This action is necessary to prevent a possible loss of airplane control and subsequent injury to the flight crew and passengers. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/07/02/04-14571/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-120-series-airplanes)
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