Airworthiness Directive · Amendment 39-19798 · Turbine section
General Electric Company Turbofan Engines
This AD applies to all General Electric Company (GE) GE90-115B model turbofan engines with engine serial numbers 907451, 907464, 907504, 907564, 907574, 907599, 907601, and 907618.
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) GE90-115B model turbofan engines. Emergency AD 2019-21-51 was sent previously to all known operators of the GE GE90-115B model turbofan engines with certain engine serial numbers. This AD requires the removal from service of the Interstage Seal, part number 2505M72P01, from the affected engines. This AD was prompted by a recent event involving an uncontained high-pressure turbine (HPT) failure, resulting in an aborted takeoff and debris penetrating the airplane's fuselage and the other engine. The FAA is issuing this AD to address the unsafe condition on these products.
Within 25 flight cycles after the effective date of this AD, remove from service the Interstage Seal, part number 2505M72P01 with serial numbers GWN0TCL3, NCE062LD, NCE254LC, NCE314KU, NCE374LB, NCE527KT, NCE777LD, or NCE994KW.
Note 1 to paragraph (g): GE Alert Service Bulletin GE90-100 S/B 72-A0826, dated October 23, 2019, contains guidance for replacing the Interstage Seal.
