Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to certain EMBRAER Model EMB-135 and -145 series airplanes, that would have required operators to inspect the pitot-true air temperature (TAT) relays and the full authority digital engine control (FADEC) electronic interface resistor modules to detect contamination; perform corrective action if necessary; clean the relay/connector pins and sockets; modify the seal between the cockpit console panels and the storm window; and/or install a new protective frame (protective sheets) at the cockpit relay supports. This new action revises the applicability of the proposed rule to add airplanes. The actions specified by this new proposed AD are intended to detect and correct oxidation of the pitot-TAT relay, which could result in increased resistance and overheating of the relay and consequent smoke in the cockpit; and to detect and correct oxidation of the FADEC electronic interface resistor modules, which could result in in-flight uncommanded engine power roll back to idle. This action is intended to address the identified unsafe condition.