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总结
美国国家运输安全委员会（NTSB）在对去年UPS一架MD-11货机在肯塔基州路易斯维尔坠毁事故的调查中，确认一处关键飞机部件发生失效，并将调查重点转向发动机支架等结构问题。多家媒体报道称，该隐患早在2011年就被波音识别并纳入关注范围，调查正评估制造商认知、维护检查与改装落实情况。后续结论可能引发对同型机队适航指令、监管披露与货运航空安全管理的调整。
正文
NTSB investigators pinpoint failed aircraft part from UPS crash last year CNN UPS Crash Probe Turns to Jet Part With Past Problems The Wall Street Journal Boeing knew of defect tied to fatal UPS plane crash in Louisville, NTSB finds WDRB NTSB says part on UPS jet that crashed was on Boeing's radar WAVE News In UPS crash, NTSB probing MD-11 engine mount issue first identified by Boeing in 2011 The Air Current
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