The AD would require all operators of the PW100G engine family to replace the main gearbox assembly and electronic engine control software. The affected models include the PW1133G-JM, PW1133GA-JM, PW1130G-JM, PW1129G-JM, PW1127G-JM, PW1127GA-JM, PW1127G1-JM, PW1124G-JM, PW1124G1-JM, and PW1122G-JM. The proposed AD would require replacement of the affected Main Gear Box assembly at the next engine shop visit after the AD’s effective date for 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 main gearbox (MGB) assembly. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and loss of the airplane.
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