美国阿拉斯加航空公司一架波音737 MAX
9客机,上周五一扇内嵌式舱门(业界称门塞)在高空飞脱,促使联邦航空管理局下令使用相同内嵌式舱门的171架波音737 MAX
9暂时停飞。据调查人员称,出事阿航客机脱落的舱门所需的4颗螺栓,可能在起飞前已经消失。
周一晚,美国国家运输安全委员会(NTSB)主席霍门迪表示,出事阿航客机用于固定该舱门的4颗螺栓,可能在起飞前已经消失。她说,这也是该局人员假设的肇因之一。霍门迪并称,内嵌式舱门原有配置的4个“止动螺栓”,应该可以防止内嵌式舱门向上移动并从飞机上脱落。她表示,当调查人员检回该舱门,螺栓并不在舱门上。调查人员正试图确定最初是否有螺栓在那里。霍门迪说:“我们目前未知那些螺栓最初是否有装在那里,还是它们是在那宗舱门飞脱事件发生时甩掉。”
在此之前不久,联合航空公司同日发声明表示,经详细检查旗下MAX 9客机后,发现有近10架MAX
9客机的内嵌舱门螺栓松动,需要额外拧紧。阿拉斯加航空也证实,其技术人员发现旗下部分同款飞机的内嵌舱门区域出现“硬件松动”(美国媒体指硬件即螺栓)。
美国使用的绝大多数波音737 MAX
9由联合航空和阿拉斯加航空运营。受影响的同型号171架机,美国占了144架。自上周六以来,联合航空停飞全部这款客机,已经取消了470多个航班,周一再取消226班机。有问题的舱门由Spirit
AeroSystems公司制造。
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