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

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This document revises an earlier proposed airworthiness directive (AD), applicable to certain EMBRAER Model EMB-135BJ and EMB- 145XR series airplanes, that would have required installation of an additional indication device to the clear-ice indication system. This new action revises the proposed rule by changing the description of the unsafe condition, and by adding instructions for modifying certain existing circuits, replacing an existing indicator lamp with a new, improved lamp, and performing other required corrections/modifications. The actions specified by this new proposed AD are intended to prevent undetected build-up of clear ice on the wing surfaces, which could lead to reduced controllability of the airplane. This action is intended to address the identified unsafe condition.