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标 题: 737 MAX事故证明美国制造已经完犊子了

发信人: helloterran (hi you), 信区: Military
标  题: 737 MAX事故证明美国制造已经完犊子了
发信站: BBS 未名空间站 (Mon Mar 11 15:25:28 2019, 美东)

737设计比较早，当时都是小函道发动机，直径比较细，所以737的起落架设计比较短。

737NG时换装大函道发动机，粗了很多，波音采用的补救方法是把发动机底下削平。

这次737MAX，换更粗更重的发动机，削平也搞不定了。

加长起落架要动机体结构，相当于重新设计一型飞机了。
波音不想重新设计、也没那个人力去重新设计，只想打补丁。

波音的解决方案是把发动机往上抬，往前挪。发动机的上沿与机翼一样高了。

这样飞机气动变得比较不稳定，有抬头倾向，容易导致失速。

737的气动是50年前定好的，波音也不想重新写飞控

波音于是又在飞控上打了一个补丁去防止失速。只要机翼上的空速管探测到失速，就自
动俯冲加速。这个补丁叫做MCAS

本来这个空速管有两个，一边一个，但是波音的阿三程序员写的逻辑很神，两边
空速管的数据没有crosscheck，只要有一个空速管故障，飞机就发疯一样的俯冲

之前737的设置是，飞行员只要拉杆，就自动取消俯冲。但是把在737MAX上，阿三程序
员为了MCAS，把自动俯冲的逻辑改了，必须手动在触摸屏上关掉一个设置才能取消俯冲
。否则飞行员就只能无休止的和想要俯冲的飞控拼体力

最后实在拉不起来，就高速撞地球。 两次空难就是这么来的，坠毁前大起大落，那是
飞行员在和阿三程序员的神代码搏命。

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