Airworthiness Directives; General Electric Company Turbofan Engines

We propose to supersede airworthiness directive (AD) 2015-15- 03, which applies to all General Electric Company (GE) GEnx turbofan engine models. AD 2015-15-03 precludes the use of certain full authority digital engine control (FADEC) software on GEnx turbofan engines. Since we issued AD 2015-15-03, GE implemented final design changes that remove the unsafe condition. This proposed AD would require removing a specific part and replacing it with a part eligible for installation and specifying the FADEC software version for the affected GEnx turbofan engines. We are proposing this AD to prevent engine failure, loss of thrust control, and damage to the airplane.