Airworthiness Directive · Amendment 39-19654 · Turbine engine accessory drive
International Aero Engines Turbofan Engines
Superseded. A later AD replaced this one: AD 2020-05-28. Comply with the one in force.
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 adopting a new airworthiness directive (AD) 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. This AD requires 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. This AD was prompted by multiple reports of in-flight engine shutdowns (IFSDs) 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, within 90 days from the effective date of this AD;
(ii) For engines that operate on 120-minute ETOPS flights, within 120 days from the effective date of this AD.
(2) For engines with MGB assembly P/N 5322505, within 120 days from the effective date of this AD, remove electronic engine control (EEC) software earlier than FCS 5.0 from the engine and load 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 FCS 5.0 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, “EEC software that is eligible for installation” is EEC software FCS 5.0 and later.
