Special Conditions: General Electric Company GEnx Model Turbofan Engines

These special conditions are issued for the General Electric Company (GE) GEnx turbofan engine models GEnx-1B54, GEnx-1B58, GEnx- 1B64, GEnx-1B67, GEnx-1B70, GEnx-1B70/72, GEnx-1B70/75, GEnx-1B72, and GEnx-1B75. The fan blades of these engines will have novel or unusual design features when compared to the state of technology envisioned in the part 33 airworthiness standards. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for these design features. These special conditions contain the added safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.