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Pilot of Boeing flight says he lost control after instrument failure

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Re: Pilot of Boeing flight says he lost control after instrument failure

#191
post #76

If you watch The Aviation Herald, this kind of reporting feels a little like trying to write news stories off VAERS data. Crazy shit is happening more or less all the time in planes; the idea isn't that nothing ever goes wrong, but that layered controls prevent injuries or hull losses. It's not that there necessarily isn't a thru-line to these stories. And I read "Flying Blind" like everyone else and share the popula…

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Re: Pilot of Boeing flight says he lost control after instrument failure

#192

Earlier quoted context omitted.

Airbus had a problem like this on an A330 due to corrupted AOA data in the flight computers. https://en.m.wikipedia.org/wiki/Qantas_Flight_72

Cosmic rays*

The most that the ATSB was able to determine was that the data corruption was basically akin to a C++ reinterpret_cast of "altitude" as "angle of attack", causing the 37,000ft or so altitude to sporadically be read as a 50 degree AoA.

The issue was not definitively traced to cosmic rays or another root cause.

Re: Pilot of Boeing flight says he lost control after instrument failure

#194

Earlier quoted context omitted.

In the sense that there's evidence of a problem with planes right now, and the question is if that problem was already there, whereas there's evidence of IDF war crimes right now, and the question is if they've always been doing them?

I think they meant in the sense of bad things happen to airplanes often enough that you could find what looks like a pattern for any given manufacturer if you looked for it, and bad things happen in armed conflict often enough that you could find what looks like a pattern for any given side in an armed conflict if you looked for it. Which isn't even to say that Israel and its armed forces are necessarily not behaving…

Suppose there's a dragon that comes out of its cave and eats a villager every seven years. A knight passes through the village, sees the dragon carry off someone's wife, and calls the villagers to arms: only for calm reason to prevail, as the village elder points out that the incidence of dragon attacks in that locale has not, when adjusted for the expanding population, and increasingly frequent human-dragon contacts, and the inherent unreliability of wooden house door-plugs, risen above historically expected levels.

Re: Pilot of Boeing flight says he lost control after instrument failure

#195

Earlier quoted context omitted.

Unless you're a pilot I'm not sure why anyone would expect that to be common knowledge. And it's insane such a system would ever be authorized IMO. That sounds like a hack to fix a memory leak or similarly some bug they can't figure out

I'm working on an aircraft program right now. We have a requirement to power cycle the plane every N days. It's in the manuals.

Why?

Re: Pilot of Boeing flight says he lost control after instrument failure

#196

The 787 is full fly by wire. Was there actually a failure of the flight control system? So far, there's not much info. Overview of 787 control system.[1] [1] https://ioactive.com/reverse-engineers-perspective-on-the-bo...

Fun fact: So is the braking. There are no hydraulic backup systems in place.

Re: Pilot of Boeing flight says he lost control after instrument failure

#197

Earlier quoted context omitted.

Yeah after the MCAS incident showing a kind of malice and the door blowout showing incompetency, I'm perfectly happy to start treating Boeing as guilty until proven innocent on these incidents. They haven't really been behaving in a way that they're worthy of giving them the benefit of the doubt. Until they start to show that they're changing their behavior (which they clearly didn't do after the MCAS incident) then…

I'm fine if you want to distrust or dislike or sanction Boeing. But that's not a good epistemology; it's not bringing you closer to understanding what's happening. It's also deeply incurious (as a rhetorical strategy, not as a belief system).

You cannot understand a thing if it kills you first.

Re: Pilot of Boeing flight says he lost control after instrument failure

#198
post #112

Earlier quoted context omitted.

Does it matter? At this stage it's just ridiculous that there's no more uproar towards Boeing or even direct intervention into it. Maybe because it's one of the 2 disfuntional members of the duopoly at the foundation of global air transit with massive geopolitical consequences if major changes are suggested.

It depends on whether you want to respond to stories like this with advocacy or understanding.

Definitely both. You never really want to stop understanding, but understanding in public interest cases serves to inform advocacy, and any story can cross the evidence threshold where advocacy becomes the primary concern. I think we're there with Boeing.

Re: Pilot of Boeing flight says he lost control after instrument failure

#199

Earlier quoted context omitted.

74gear[1] on YouTube is a 747 Captain. It's a great aviation channel in general if anyone is interested in that stuff. He had mentioned two things that really illustrated to me your point a while back: A) Stuff breaks on planes. All the time. They are complex machines, but they typically have so many redundancies that unless there is a completely catastrophic failure, they are still perfectly safe to fly. An example:…

Yes but do the flight crew have the ability to tell if a plane is safe to fly? Without a deep understanding of the design of the plane they rely a lot on the metrics that the plane manufacturer display and on the manufacturers manuals to interpret them.

> Yes but do the flight crew have the ability to tell if a plane is safe to fly?

Do you have the ability to tell if a street is safe to cross?

Most of the time, yes.

Sometimes, you can't tell for sure, but you cross anyways.

Sometimes, you are dead wrong about your judgement. Shit happens. Nobody expects 100% certainty.

The problem here may be that Boeing may be falling to meet the expectation of 99.????% certainty, and regressing down to 99.????% certainty, due to a broken corporate culture.

Re: Pilot of Boeing flight says he lost control after instrument failure

#200

Earlier quoted context omitted.

I'm working on an aircraft program right now. We have a requirement to power cycle the plane every N days. It's in the manuals.

Why?

> Why?

Radiation-induced bit flips and bad code.

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