Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain EMBRAER Model ERJ 170-100 LR, -100 STD, -100 SE, -100 SU, - 200 LR, -200 STD, and -200 SU airplanes and Model ERJ 190 airplanes. This proposed AD would require inspecting to determine the part number and serial number of the deployment actuator of the ram air turbine (RAT) and related investigative and corrective actions if necessary. This proposed AD results from reports that the RAT may not fully deploy due to galling between the piston rod and gland housing of the deployment actuator. We are proposing this AD to prevent the RAT from failing to deploy, which could result in loss of control of the airplane during in-flight emergencies.