Airworthiness Directive · Amendment 39-19878 · Turbine engine accessory drive
International Aero Engines LLC Turbofan Engines
This AD applies to all International Aero Engines, LLC (IAE) PW1133G-JM, PW1133GA-JM, PW1130G-JM, PW1129G-JM, PW1127G-JM, PW1127GA-JM, PW1127G1-JM, PW1124G-JM, PW1124G1-JM, and PW1122G-JM model turbofan engines.
The FAA is superseding Airworthiness Directive (AD) 2019-11-08 for all International Aero Engines, LLC (IAE) PW1133G-JM, PW1133GA-JM, PW1130G-JM, PW1129G-JM, PW1127G-JM, PW1127GA-JM, PW1127G1-JM, PW1124G- JM, PW1124G1-JM, and PW1122G-JM model turbofan engines. AD 2019-11-08 required the removal of the main gearbox (MGB) assembly and electronic engine control (EEC) software and the installation of a part and software version eligible for installation for engines that operate on extended operations (ETOPS) flights. This AD retains the requirements of AD 2019-11-08 and requires replacement of the MGB assembly and EEC software on engines that do not operate on ETOPS flights. This AD was prompted by multiple reports of in-flight engine shutdowns as the result of high-cycle fatigue causing fracture of certain parts of the MGB assembly. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Remove the MGB assembly, part number (P/N) 5322505, and install a part eligible for installation as follows:
(i) For engines that operate on 180-minute extended operations (ETOPS) flights, before further flight after the effective date of this AD.
(ii) For engines that operate on 120-minute ETOPS flights, within 120 days from June 28, 2019 (the effective date of AD 2019-11-08), or before further flight after the effective date of this AD, whichever occurs later.
(iii) For engines that do not operate on ETOPS flights, at the next engine shop visit after the effective date of this AD.
(2) For engines with MGB assembly P/N 5322505, within 120 days from June 28, 2019 (the effective date of AD 2019-11-08), or before further flight after the effective date of this AD, whichever occurs later, remove electronic engine control (EEC) software earlier than FCS5.0 from the engine and install EEC software that is eligible for installation.
(1) After the effective date of this AD, do not install integrated drive generator (IDG) oil pump drive gearshaft assembly, P/N 5322630-01, into an MGB assembly.
(2) After the effective date of this AD, do not load EEC software earlier than FCS5.0 on any engine identified in paragraph (c) of this AD with an MGB assembly, P/N 5322505.
(1) For the purpose of this AD, a “part eligible for installation” is an MGB assembly with an IDG oil pump drive gearshaft assembly other than P/N 5322630-01.
(2) 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 flanges, except that the separation of engine flanges solely for the purposes of transportation of the engine without subsequent engine maintenance does not constitute an engine shop visit.
(3) For the purpose of this AD, “EEC software that is eligible for installation” is EEC software FCS5.0 and later.
