# Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series Airplanes
> **Rule** · Final rule. · Published 2003-07-24 · Effective 2003-08-28 · 68 FR 43621
## Document
- **Document number:** 03-18417
- **Category:** airworthiness
- **Manufacturer:** Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 68 FR 43621
- **Publication date:** 2003-07-24
- **Effective date:** 2003-08-28
- **FAA docket:** Docket No. 2000-NM-257-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to all EMBRAER Model EMB-145 series airplanes, that currently requires repetitive replacement of the bleed-air check valve and associated gaskets on the bleed low-pressure lines of the engines with new parts. This amendment continues to require repetitive replacement of the bleed-air check valves and associated gaskets. Additionally, this amendment provides for optional terminating action for the repetitive replacement of bleed-air check valves by installing new improved check valves, and adds airplanes to the applicability of the existing AD. This amendment also clarifies that the replacement and follow-on actions are required for the left- and right-hand engines. The actions specified by this AD are intended to prevent failure of the bleed-air check valves on the bleed low-pressure lines of the engines, which could result in engine compressor stall and consequent flameout of the affected engines. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/07/24/03-18417/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and--145-series)
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