# Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and EMB-145 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-11-30 · Effective 1999-12-15 · 64 FR 66760
## Document
- **Document number:** 99-30625
- **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:** 64 FR 66760
- **Publication date:** 1999-11-30
- **Effective date:** 1999-12-15
- **FAA docket:** Docket No. 99-NM-340-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to all EMBRAER Model EMB-135 and EMB-145 series airplanes. This action requires a revision to the Airplane Flight Manual (AFM) to prohibit in-flight operations of the autopilot coupled to flight director #2 during certain conditions; and installation of an associated warning placard. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified in this AD are intended to prevent failure of the autopilot to automatically disconnect from flight director #2, as intended, at a low altitude during windshear conditions. Such failure could result in reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/11/30/99-30625/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-135-and-emb-145)
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