# Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 Airplanes and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes
> **Rule** · Final rule. · Published 2005-11-23 · Effective 2005-12-28 · 70 FR 70707
## Document
- **Document number:** 05-22972
- **Category:** airworthiness
- **Manufacturer:** Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 70707
- **Publication date:** 2005-11-23
- **Effective date:** 2005-12-28
- **FAA docket:** Docket No. FAA-2005-20011
## Abstract

The FAA is superseding an existing airworthiness directive (AD), which applies to certain EMBRAER Model EMB-135 airplanes and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP airplanes. That 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 new AD adds an optional revision to the AFM that allows limited APU starts and adds a terminating action. This AD results from the airplane manufacturer developing modifications that revise or eliminate the need for restrictions to in-flight APU starts. We are issuing 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/11/23/05-22972/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-airplanes-and)
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