Special Conditions; Embraer Model CBA-123 Airplane In the matter of Aft fuselage design structural requirements to prevent propeller strike, Eight-pound bird strike protection for the aft fuselage mounted powerplant structural system and propellers. Propeller blade fire resistance. Propulsion system susceptibility to damage from loss of airplane components and shed ice, and Propeller ground clearance.

These special conditions are issued for the Embraer Model CBA-123 airplane in order to establish structural design requirements to prevent propeller blade ground strike, provide eight-pound bird strike protection for the aft fuselage mounted powerplant system, provide propeller blade fire resistance, limit propulsion system susceptibility to damage from loss of airplane components and shed ice, and provide propeller blade ground clearance. Final special conditions have already been issued for this airplane to protect high-technology digital avionics from the effects of lightning and high-intensity radiated fields (HIRF). This airplane will have novel and unusual design features when compared to the state of technology envisioned is the airworthiness standards of part 25 of the Federal Aviation Regulations (FAR). These special conditions contain additional safety standards which the Administrator considers necessary to establish a level of safety equivalent to that establishedby the airworthiness standards of part 25. Further special conditions will be developed at a later date on engine cowl retention.