# Airworthiness Directives; Empresa Brasileira del Aeronautica S.A. (EMBRAER) Model EMB-120, -120ER, -120FC, -120QC, and -120RT Airplanes
> **Rule** · Final rule. · Published 2006-06-13 · Effective 2006-07-18 · 71 FR 34000
## Document
- **Document number:** 06-5245
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 34000
- **Publication date:** 2006-06-13
- **Effective date:** 2006-07-18
- **FAA docket:** Docket No. FAA-2006-24076
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain EMBRAER Model EMB-120, -120ER, -120FC, -120QC, and -120RT airplanes. This AD requires replacing the shut-off and crossbleed valves of the bleed air system with new valves having hermetically sealed switches. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent a potential source of ignition near a fuel tank, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/06/13/06-5245/airworthiness-directives-empresa-brasileira-del-aeronautica-sa-embraer-model-emb-120--120er--120fc)
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