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波音737 MAX系列客机接连发生空难，全球停飞至今。美国传媒周五报道，波音公司为求该款客机获监管机构批准复飞，6月时曾差不多完成重新设计客机电脑软件，但在模拟测试飞行时发现软件失灵，令客机至今未获准复飞。

彭博社引述消息人士指出，波音工程人员曾修正737 MAX两个负责操作自动驾驶及主要仪器的电脑系统，不过在模拟测试飞行时，发现比直接修改客机用来防止失速的“机动特性增强系统”(MCAS)更加复杂。

此前印尼狮子航空及埃塞俄比亚航空2宗空难，均被指与MCAS出错，导致客机的机头强制向下有关。

相关问题亦令美国联邦航空局及欧洲航空安全局要求波音提交更多新软件开发过程的文件供审核。

波音前工程师莱梅表示，与重新设计MCAS相比，修改飞行电脑的安全测试无疑更多，客机复飞之期可能更遥远，“原本只有10个情景需测试，现在起码有100个”。

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