Special Conditions: Embraer S.A. Model EMB-545 and EMB-550 Airplanes; Installation of an Airbag System To Limit the Axial Rotation of the Upper Leg on Single- and Multiple-Place Side-Facing Seats

These special conditions are issued for the Embraer S.A. (Embraer) Model EMB-545 and EMB-550 series airplanes. These airplanes will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport- category airplanes. This feature is an airbag system designed to limit the axial rotation of the upper leg on single-place and multiple-place side-facing seats. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.