| General > General Technical Chat |
| Another deadly 737 Max control bug just found! |
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| EEVblog:
--- Quote from: BBBbbb on June 27, 2019, 10:04:46 am ---I do hope BA got a hell of a discount on the recent order of 200pcs of these things... --- End quote --- I can't help but visualise a Digikey order cart... |
| mac.6:
It's possible that the lockup fires the watchdog, but then you have to restart the system, then the system must recognize and correct the current situation, could take a dozen of seconds or more, enough to put the plane in the dangerous zone. Even if the watchdog is quick enough to recover, it's an unacceptable situation, especially in this case. |
| BBBbbb:
I've haven't followed the issue close enough for the past two months, are they still trying to avoid re-certification of the aircraft and new training of the pilots, by using SW to mimic the 737 dynamics? If so, that would explain lack of watchdog trigger... --- Quote from: EEVblog on June 27, 2019, 11:39:31 am --- --- Quote from: BBBbbb on June 27, 2019, 10:04:46 am ---I do hope BA got a hell of a discount on the recent order of 200pcs of these things... --- End quote --- I can't help but visualise a Digikey order cart... --- End quote --- well ordering 200 of something with such a hefty price tag, that has a very uncertain future, seems a bit irresponsible, more appropriate for a personal order on DigiKey... Heck, even for a personal project I'd think twice about ordering an IC with a suspicious EoL date. I'm certain they made sure they can opt out without consequences if something goes wrong with the "fix", but still has to be one hell of a bargain |
| GeorgeOfTheJungle:
The toyota unintended acceleration issue/bug didn't trigger any watchdog either. |
| sokoloff:
--- Quote from: mac.6 on June 27, 2019, 11:40:10 am ---It's possible that the lockup fires the watchdog, but then you have to restart the system, then the system must recognize and correct the current situation, could take a dozen of seconds or more, enough to put the plane in the dangerous zone. Even if the watchdog is quick enough to recover, it's an unacceptable situation, especially in this case. --- End quote --- If it's a system that only auto-drives stab trim, I'd think that dozens of seconds would not be a flight safety risk. (It's a jackscrew, so removing power just leaves the trim as-is, which is almost surely safe.) |
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