b*********3
发帖数: 1709 | 1 【 以下文字转载自 Military 讨论区 】
发信人: beijingren3 (), 信区: Military
标 题: 737 Max：来自西雅图的破烂最终还是留在了地上
发信站: BBS 未名空间站 (Sat Mar 16 13:39:55 2019, 美东)
737 Max: Finally the scrap from Seattle has to stay on the ground
https://www.veteranstoday.com/2019/03/15/737-max-finally-the-scrap-from-
seattle-has-to-stay-on-the-ground/
https://www.youtube.com/watch?v=9t7hX-UVzR8 |
b*********3
发帖数: 1709 | 2 The B 737 MAX is a faulty design from the beginning. Anyone who knows
anything about aerodynamics will recognize it immediately if they only look
at the aircraft.
The example of the Boeing 737 and especially the latest development stage
MAX 8/9 shows how fatal it is when it is not engineers who make the
decisions, but merchants. No engineer in his right mind would have built the
737 MAX like this if he hadn’t been forced to do so by greedy managers.
The nearly 400 deaths in two crashes were caused by Boeing’s board of
directors, as well as the threatening bankruptcy of the entire company. |
b*********3
发帖数: 1709 | 3 It’s not the engineers who are responsible, it’s the managers.
Now you should know that the tailplane trim of all smaller Boeing models has
always been a prone crutch. It’s a motor-spindle unit that tends to “run
away” or jump out and jam if a relay fault occurs. For this reason there
was a prominently placed emergency switch on the B 727 with which the trim
motor could be switched off. This was practiced in the simulator. The newer
737 models no longer have this emergency shutdown device.
So the pilots can’t switch off the trim motor and save the plane even if
they recognized the error. They would have to switch off the entire busbar
on which the trim motor hangs. But this would shut down other elementary
systems and it is a process that cannot be carried out in a fraction of a
second. So if the only sensor for the angle of attack sends a wrong signal
to the only computer, then this aircraft can no longer be saved, at least if
it flies at low altitude. |
a**e
发帖数: 8800 | 4 说白了就是华尔街+AA
【在 b*********3 的大作中提到】
: It’s not the engineers who are responsible, it’s the managers.
: Now you should know that the tailplane trim of all smaller Boeing models has
: always been a prone crutch. It’s a motor-spindle unit that tends to “run
: away” or jump out and jam if a relay fault occurs. For this reason there
: was a prominently placed emergency switch on the B 727 with which the trim
: motor could be switched off. This was practiced in the simulator. The newer
: 737 models no longer have this emergency shutdown device.
: So the pilots can’t switch off the trim motor and save the plane even if
: they recognized the error. They would have to switch off the entire busbar
: on which the trim motor hangs. But this would shut down other elementary
|
