Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series Airplanes

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 series airplanes. This proposal would require replacement of the air turbine starters (ATS) with modified ATSs. This action is necessary to prevent sheared ATS output shafts, which could result in oil flowing down the engine accessory gear box shafts and dripping into the engine compartments, and consequent oil fire, in-flight shutdown, and/or rejected take-off. This action is intended to address the identified unsafe condition.