# Proposed AD 2000-NM-257-AD: Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-15-02
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 20, 2001, 66 FR 15667
- Comments due: April 19, 2001
- Became: [AD 2003-15-02](https://openairdocs.org/ad/2003-15-02)
- Docket: 2000-NM-257-AD
- FR document: 01-6793
- Official PDF: https://openairdocs.org/files/sha256/6e/27/6e2783122fdb965c61236f39c7231071f112a4b476047c30dae73752e58f9088 (from https://www.govinfo.gov/content/pkg/FR-2001-03-20/pdf/01-6793.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/03/20/01-6793/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and--145-series
- Page: https://openairdocs.org/proposed/2000-NM-257-AD

## Summary

This document proposes the supersedure of 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 line of the engine, with new parts. This action would continue to require repetitive replacement of the bleed-air check valve and associated gaskets. Additionally, this action would require repetitive replacement of an additional bleed-air check valve with a check valve having the same part number or a new improved check valve; eventual replacement of the bleed-air check valves with new improved check valves and various follow-on actions; and would add airplanes to the applicability of the existing AD. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent failure of the bleed-air check valve on the bleed low-pressure line of the engine, which could result in engine compressor stall and consequent stall flameout of the affected engine.

## Notices in this docket

- Mar 20, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-6793, comments due Apr 19, 2001 (https://www.federalregister.gov/documents/2001/03/20/01-6793/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and--145-series)

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