General > General Technical Chat
Another deadly 737 Max control bug just found!
CiscERsang:
--- Quote from: blueskull on June 28, 2019, 06:56:01 am ---
--- Quote from: CiscERsang on June 28, 2019, 06:25:06 am ---Too late. The comprehensive scrutiny must have been performed before first commercial flight. Not today.
--- End quote ---
A320 is to date, the only commercial jetliner crashed on its debut, yet it is still one of the most successful planes among B737 and DC10, which on its own is also riddled with fatalities.
--- End quote ---
There's always flipside of the coin. Such things like, competition, struggle for the markets, rush... that I mean.
BravoV:
--- Quote from: Kleinstein on June 27, 2019, 04:03:32 pm ---Still odd that the problem was found in the more official tests and not with Boing internal ones.
--- End quote ---
The fact is no different from Boeing bought and used a lot of these similar to those One Hung Low's stuffs ...
Kleinstein:
--- Quote from: MasterTech on June 28, 2019, 05:45:53 am ---Watch from 1:05:00 to 1:06:30, pilot admits Boeing engineers contacted them to tell them that there are "negative dynamic stabilisation problems" with the 737Max
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The next 5 minutes following are interesting: The pilots essentially say that they consider the MCAS system without an explanation and extra training more of a problem than a help.
In hind sight this makes absolute sense: even if working as intended the MACS intervention to a pilot who does not know about the system (the initial state) should see this as a system failure / run away trim situation. So it is odd to add such a system to avoid extra training - it is more in the opposite: due to the MACS the pilots would need extra training / simulator hours.
Back to the topic of the new thread: It looks like the new bug found was in the software fix that Boing made in a hurry. So it does not effect the old planes - except that flown by FAA test pilots for real world testing. Odd they found the bug in the simulator now and not before or during flight testing.
Kjelt:
--- Quote from: Sal Ammoniac on June 27, 2019, 03:58:14 pm ---It's very unlikely that any warm reset would take dozens of seconds on a control system like this one.
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Not sure how many systems you need to fly this plane probably the fancy GUI computers are not needed?
Also not sure how accurate the sims are these days but from cold start to having visual GUI displayed takes over one and a half minute
https://youtu.be/vW6gMzDsKCg
GeorgeOfTheJungle:
No no no, they just had to keep pushing the (electric) trim button on the yoke before flipping the stab cutout switch, because that button overrides MCAS. They didn't use it properly, not pressing for long enough. Could also have put the flaps lever to position 1, this disables MCAS and makes the jack screw nut turn faster when trimming with the yokes button.
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