# Proposed AD FAA-2005-20011: Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-24-02
- Products: Embraer
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 12, 2005, 70 FR 2057
- Comments due: February 11, 2005
- Became: [AD 2005-24-02](https://openairdocs.org/ad/2005-24-02)
- Docket: FAA-2005-20011 (https://www.regulations.gov/docket/FAA-2005-20011, where comments are filed)
- Project: 2003-NM-22-AD
- FR document: 05-539
- Official PDF: https://openairdocs.org/files/sha256/bf/50/bf5063e5b25198631fb380ae199043dea4db95f28b5e96f25ee981aae12bc838 (from https://www.govinfo.gov/content/pkg/FR-2005-01-12/pdf/05-539.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/01/12/05-539/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and--145-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9EE31AB018B9081C86256F87005F3F9E.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20011

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain EMBRAER Model EMB-135 and -145 series airplanes. The existing AD currently requires revising the airplane flight manual (AFM) to prohibit in-flight auxiliary power unit (APU) starts, and installing a placard on or near the APU start/stop switch panel to provide such instructions to the flightcrew. This proposed AD would add an optional revision to the AFM that allows limited APU starts and would add a terminating action. This proposed AD is prompted by the airplane manufacturer developing modifications that revise or eliminate the need for restrictions to in-flight APU starts. We are proposing this AD to prevent flame backflow into the APU compartment through the eductor during in-flight APU starts, which could result in fire in the APU compartment.

## Notices in this docket

- Jan 12, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-539, comments due Feb 11, 2005 (https://www.federalregister.gov/documents/2005/01/12/05-539/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and--145-series)

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