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总结
美国国家运输安全委员会(NTSB)报告称，UPS一架货机去年在肯塔基州路易斯维尔坠毁前，波音早在2011年就已注意到与事故相关的某关键部件存在易裂缺陷，但该风险仍在机队中出现并最终失效。调查人员认为该部件断裂引发控制问题并导致坠机。报告引发对制造商风险通报、适航改装与维护监管是否充分的质疑，或推动更严格检查及后续责任追究。
正文
Boeing knew of flaw in part linked to UPS plane crash, US safety board report says BBC Boeing Knew About Flaws in UPS Plane That Crashed in Louisville, N.T.S.B. Says The New York Times NTSB investigators pinpoint failed aircraft part from UPS crash last year CNN NTSB says part on UPS jet that crashed was on Boeing's radar WAVE News Cracked part in fatal UPS crash flagged in 2011 by Boeing CNBC
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