Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to certain EMBRAER Model EMB-120 series airplanes, that would have superseded an existing AD that currently requires repetitive visual checks or inspections to verify that the flight idle stop system circuit breakers are closed, and functional tests to determine if the backup flight idle stop system is operative. A supplemental NPRM was issued to require modification of the secondary flight idle stop system (SFISS), which would terminate the repetitive actions. This supplemental NPRM would remove one airplane from the applicability; and would add new inspections and corrective actions if necessary. The actions specified by this proposed AD are intended to prevent inadvertent or intentional operation with the power levers below the flight idle stop during flight for airplanes that are not certificated for in-flight operation, which could result in engine overspeed and consequent loss of controllability of the airplane.