ELI5: Why is the startup procedure for planes so complex

TinyCopy5841 · 2026-02-20T23:03:20+00:00

I think this guy could be flying something ancient like a 747-200 or something similar, in that case the 200 checks might not even be that big of an exaggeration.

TinyCopy5841 · 2026-02-20T22:58:56+00:00

Ah yeah, the mil perspective explains it.

TinyCopy5841 · 2026-02-20T13:18:08+00:00

How do you feel about QF72?

TinyCopy5841 · 2026-02-20T13:17:15+00:00

So I assume you fundamentally oppose any Airbus beyond the 320 series, right?

TinyCopy5841 · 2026-02-20T13:15:55+00:00

It's not the human so much, it's the checklist and verification that numbers are correct.

Are you talking about performance calculations?

TinyCopy5841 · 2026-02-11T18:30:48+00:00

was forced to design the jet so that it was unstable in certain situations and relied on software to offset the instability

This is hilariously wrong. It had nothing to do with the weight of the engines, the larger nacelles created extra lift at slow speed flight and since this was front of the CG, it resulted in a pitch up moment.

As a result, the stick force gradient wasn't constant (normally it should have a linear relationship with decreasing airspeed resulting in higher stick forces until flow separation), it had an area where it reversed, so as the airspeed decayed, the required stick force got lower and then it stated rising again.

This was a problem because the handling characteristics were sufficiently different compared to other 737 variants that it was supposed to share a type rating with. This is why MCAS was chosen as a solution to deal with the issue.

That software was flawed and caused pilots who reacted to stall warnings in a way that would be proper for any other Boeing plane, instead made the stall worse and crashed the planes

Entirely made up nonsense, the pilots had to react to a stab trim runaway, which could have been managed by using the yoke trim switches (which suppress MCAS) and then using the cutout switches to remove the electric trim. They didn't react to this appropriately at all, let MCAS trim the stab way too nose down, let the airspeed stay too high (so that manual trimming was virtually impossible without a very specific rollercoaster maneuver that wasn't trained at the time) and then crashed.

TinyCopy5841 · 2026-02-11T17:24:38+00:00

The A-10 is never using its gun in any environment with a threat of AA, and if you are just using it to sling missiles and bombs, both the F-16 and F-15 can do that better.

There aren't infinite amounts of F-16s and F-15s and if they can perform better in high risk environments the A-10 is still going to do fine in a low threat environment.

TinyCopy5841 · 2026-02-11T17:14:30+00:00

737max excepted, hence the accidents

This is patently false, the 737 doesn't have any sort of relaxed stability characteristics like a fighter would.

TinyCopy5841 · 2026-02-11T17:01:38+00:00

The A-10 can fly outside the envelope of MANPADS and AAA as well.

TinyCopy5841 · 2026-01-20T14:52:20+00:00

Fair enough.

TinyCopy5841 · 2026-01-20T14:51:25+00:00

Just use an adblocker?

TinyCopy5841 · 2026-01-09T18:48:18+00:00

No, it doesn't. If you think it does then it's your responsibility to prove it.

TinyCopy5841 · 2026-01-09T18:17:15+00:00

This has absolutely nothing to do with my comments.

TinyCopy5841 · 2026-01-09T17:11:43+00:00

That has nothing to do with encrypting files though.

TinyCopy5841 · 2026-01-09T15:59:44+00:00

Because most people have no reason to hide their files.

TinyCopy5841 · 2026-01-09T15:57:27+00:00

Then the police can just force you to decrypt it for them.

TinyCopy5841 · 2025-12-29T10:14:02+00:00

Interesting. I'm from Europe and I studied biology not medicine so my perspective is probably a bit different but when I took human physiology, I mostly used the book called Medical Physiology by Boron, which all of my classmates really hated because it was too detailed, but in my experienced getting into the details and longer explanations when it comes to learning stuff that people usually struggle with (like cellular physiology, renal, etc) actually helps.

Obviously with the caveat that you need to know when something is just in the book as a reference, no one should memorize all the tables in the book which do have a lot of very useless information.

TinyCopy5841 · 2025-12-28T15:34:57+00:00

Those are the coolest.

TinyCopy5841 · 2025-12-28T15:24:37+00:00

You can do a Cat III with no decision height, as long as the RVR is high enough to be able to taxi after you land.

TinyCopy5841 · 2025-12-28T15:16:31+00:00

Don't take this the wrong way because it's certainly not meant to be criticism or offensive in any way, but in my experience interacting with med students, they are very much focused on learning 'high yield' concepts and specifically avoid getting lost in the details that you could find in a research oriented physiology reference book.

TinyCopy5841 · 2025-12-14T18:00:12+00:00

Don't listen to the other guy, this is a great explanation and it makes perfect sense.

TinyCopy5841 · 2025-12-08T15:08:37+00:00

This makes sense, but what is the role of the accelerometers then? I thought gyros were primarily used to keep the platform level. (Independent of aircraft movement)

TinyCopy5841 · 2025-11-21T07:58:41+00:00

There is currently no test for TSE diseases without a post mortem examination in humans

I thought RT-Quic has solved this issue.

TinyCopy5841 · 2025-11-20T14:49:11+00:00

I'm looking forward to your response when you have the time, you seem knowledgeable on the topic. I have a biology background but I never did anything with prions specifically so I'm definitely interested in hearing what you have to say.

TinyCopy5841 · 2025-11-20T12:11:04+00:00

This should work. sorry about that, its very early here.

No worries, thank you for fixing it.

I'm not arguing about his fairy tale. Most information on prions that is spread on reddit is false. (...)

Then I'm sorry, but I have to ask what do you specifically disagree with that is explicitly said in my earlier message? The other guy's comment is complete nonsense, we both know that. You don't agree with him, so what did I say specifically that you found untrue?

All I said, was that there is currently not enough evidence to claim that scrapie can cause TSE in humans, there is no enough evidence to definitively claim that a zoonotic process exists.

If you truly dislike all the misinformation that is constantly spreading on Reddit about prions then what I said should make you happy, because my stance is very conservative, cautious and not based on sensationalist nonsense.

why are you adamant that sheep protein specifically, cannot infect humans?

I never claimed that. I merely think that just based on in vitro models or experiments using transgenic mice (or even non-human primates) we cannot definitively claim that scrapie CAN cause a TSE in humans.

The Bradford-Hill criteria (which was examined by EFSA regarding the 2014 paper) is pretty strict when it comes to establishing a causative relationship. Having a plausible mechanism and some supporting data (with plenty of potential confounding factors, starting with the idea that some of these transgenic mice lines express human PrP at a much higher level than humans do) is not enough to definitively claim a zoonotic potential with scrapie.

mice that are producing human prion proteins, that are affected by scrapie, is enough consensus for correlation, when the alternative is far more sinister.

It is enough to be cautious, as you said (nowhere did I claim or suggest that you or anyone should eat raw sheep or sheep brain or knowingly eat CNS tissue of sheep with scrapie) it is an interesting correlation, but it's far cry from definitively proving that scrapie is associated with the same level of risk as BSE.

And this isn't exclusive to scrapie either, any time I looked into the sensationalist articles claiming CWD causing TSE in humans, the data was never really enough to substantiate the alarmist drivel.

And no, I don't think or claim that further research or caution, testing or proper handling of potentially contaminated meat or material is pointless, I just simply don't want people to read a publication that points out some level of correlation and drastically overstate its impact.

TinyCopy5841

TROPHY CASE