Airworthiness Directive · Amendment 39-21149 · Engine controls
General Electric Company Turbofan Engines
This AD applies to all General Electric Company (GE) GEnx-1B and GEnx-2B model turbofan engines.
The FAA is superseding Airworthiness Directive (AD) 2017-09-06 for all General Electric Company (GE) GEnx-1B and GEnx-2B model turbofan engines. AD 2017-09-06 required updating electronic engine control (EEC) full authority digital electronic control (FADEC) software on GEnx-1B and GEnx-2B turbofan engines and replacing a certain fan hub frame assembly part installed on GEnx-2B turbofan engines. This AD requires updating EEC software on GEnx-1B and GEnx-2B engines and replacing a certain fan hub frame assembly part installed on GEnx-2B engines. This AD was prompted by the development of a design change by GE to remove the unsafe condition. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Within 120 days after the effective date of this AD, install electronic engine control (EEC) software that is eligible for installation.
(2) At the next engine shop visit after June 9, 2017 (the effective date of AD 2017-09-06), or before further flight, whichever occurs later, remove from service all GE GEnx-2B67, -2B67B, and -2B67/P fan hub stator assembly booster outlet guide vanes (BOGV), part number (P/N) B1316-00720, and replace with a part eligible for installation.
(1) For the purpose of this AD, an “engine shop visit” is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine case flanges, except for the following which do not constitute an engine shop visit:
(i) Separation of engine flanges solely for the purposes of transportation without subsequent maintenance does not constitute an engine shop visit.
(ii) Separation of engine flanges solely for the purpose of replacing the fan or propulsor without subsequent maintenance does not constitute an engine shop visit.
(2) For the purpose of this AD, EEC software that is eligible for installation is:
(i) For GE GEnx-1B model turbofan engines, EEC software that is version B200 or later.
(ii) For GEnx-2B model turbofan engines, EEC software that is version C090 or later.
(3) For the purpose of this AD, a part eligible for installation is a fan hub stator assembly BOGV which:
(i) Is not P/N B1316-00720; or,
(ii) Was previously a P/N B1316-00720, but has been repaired and modified into P/N B1316-07637.
