General > General Technical Chat
The half a millimeter error that nearly cost 469 lives
Black Phoenix:
--- Quote from: KE5FX on December 15, 2023, 11:02:13 pm ---
--- Quote from: johansen on December 15, 2023, 10:30:06 pm --- if the cost of airplane flights go up.. so be it.
--- End quote ---
If the cost of airplane flights goes up, more people will drive, and you'll end up killing more people as a result.
On a machine this complex, every knob you turn has interacting effects.
--- End quote ---
Exactly. Whatever you do gravity will always win, what goes up must come down. That's the gist of the physics and we are still not that advance to rewrite physics as we known.
Still I read a ton more of his articles and then cross referencing with the original investigations. It was a nice way to pass some boring evenings I had this week.
EPAIII:
--- Quote from: johansen on December 15, 2023, 09:55:13 pm ---
--- Quote from: porter on December 15, 2023, 10:08:11 am ---Here is an interesting article about the safety of the 737 max. Another look into design decisions and quality control.
HOW THE BOEING 737 MAX DISASTER LOOKS TO A SOFTWARE DEVELOPER
--- Quote ---The flight management computer is a computer. What that means is that it's not full of aluminum bits, cables, fuel lines,
or all the other accoutrements of aviation. It's full of lines of code. And that's where things get dangerous.
Those lines of code were no doubt created by people at the direction of managers. Neither such coders nor their managers are as in touch with the particular culture
and mores of the aviation world as much as the people who are down on the factory floor, riveting wings on, designing control yokes, and fitting landing gears.
Those people have decades of institutional memory about what has worked in the past and what has not worked. Software people do not.
--- End quote ---
https://spectrum.ieee.org/how-the-boeing-737-max-disaster-looks-to-a-software-developer
--- End quote ---
simple fix for this. hold the software developers liable for their criminal negligence.
--- End quote ---
Interesting thought. But what about the managers who are providing the guidance and the PRESSURE to get it done yesterday?
And no, I am not a software developer. But I have written some code, but nothing anywhere near the level that we are talking about here.
NiHaoMike:
--- Quote from: KE5FX on December 15, 2023, 11:02:13 pm ---If the cost of airplane flights goes up, more people will drive, and you'll end up killing more people as a result.
--- End quote ---
The US makes it too easy to get a driver's license, such that plenty who are driving shouldn't be driving. But that's for another topic.
porter:
Some additional information regarding the 737 max software.
--- Quote ---Further details emerged that Boeing had outsourced some of the coding to developers who were bring paid as little as $9 per hour.
Naturally, emotions turned to shock and outrage.
--- End quote ---
Boeing’s Software Development Problem
https://www.devteam.space/blog/boeings-software-development-problem/
tom66:
Talking about Swiss-cheese model, A330-300 flight CI202 operated by China Airways makes me a little nervous as to what bugs remain undiscovered.
https://www.ttsb.gov.tw/media/4936/ci-202-final-report_english.pdf
In summary, a previously undiscovered timing bug between flight computers monitoring pilot rudder input led to a triplicate failure of flight systems (within a few seconds of each other) upon landing. However, it must be said, despite losing three FCs, the aircraft was still controllable and landed safely, though lost thrust reversers, the ground spoilers, and the autobraking meant the aircraft only had 10 metres of runway left to spare.
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