Airworthiness Directive · Amendment 39-17669 · General Electric Company Turbofan Engines
General Electric Company Turbofan Engines
This AD applies to certain serial number General Electric Company (GE) model GEnx-2B67 and GEnx-2B67B turbofan engines. The affected engine serial numbers are: 959-102 through 959-104; 959-107; 959-110 through 959-111; 959-113 through 959-118; 959-121; 959-124 through 959-133; 959-159 through 959-161; 959-164; 959-176; and 959-191.
We are adopting a new airworthiness directive (AD) for certain General Electric Company model GEnx-2B67 and GEnx-2B67B turbofan engines. This AD was prompted by the original equipment manufacturer's disclosure that certain critical rotating life-limited parts (LLPs) used in Boeing 747-8 flight tests had consumed more cyclic life than they would have in revenue flight cycles. These parts were then installed into engines and introduced into revenue service without adjustment to remaining cyclic life. This AD requires a one-time adjustment to the cycle counts of those LLPs to account for the additional low cycle fatigue (LCF) life consumed during flight tests. We are issuing this AD to prevent the failure of critical rotating LLPs, uncontained engine failure, and damage to the airplane.
Within 30 days after the effective date of this AD, perform a one-time adjustment to the cycle count of each part identified in paragraph 4, Appendix A, of GE Service Bulletin No. GEnx-2B S/B 72-0116, Revision 1, dated April 23, 2013.
