# Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and EMB-145 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2001-05-11 · Effective 2001-05-29 · 66 FR 24049
## Document
- **Document number:** 01-11899
- **Category:** airworthiness
- **Manufacturer:** Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and EMB-145 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 24049
- **Publication date:** 2001-05-11
- **Effective date:** 2001-05-29
- **FAA docket:** Docket No. 2001-NM-123-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and EMB-145 series airplanes. This action requires revising the FAA-approved Airplane Flight Manual 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 flight crew. This action is necessary 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. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/05/11/01-11899/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and-emb-145)
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