Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "Plainly Difficult" channel.

Great video! 33:40 As far as I know, Boeing was "forced" to use only one sensor because FAA has strict rule that any system that's built redundant is considered a critical system. And all critical systems require pilot training to handle any malfunction in critical system. As Boeing had already decided that MAX shall not require any additional training, they decided to pretend that MCAS is a non-critical system and to make this pass FAA rules, they couldn't use both sensors at the same time. I guess the FAA rules should also say that any system that can override pilot input is considered critical. That way Boeing or anybody else couldn't try to use tricks like this.
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@madkills10 If you use high quality (that is, low sulfur) fuel only and use the official spec engine oil, the DPF clogging should be pretty rare. However, you should never ever use cars with DPF for daily travel where single run is less than 5 minutes because that will clog the filter. If you regularly use your car to run less than 5 minutes at a time, you should definitely consider selling the car and using e-bike instead. It would easily make such short runs, it would be cheaper and better for the environment.
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Great work on the documentary! I was under impression that the alternative ECU program was activated by the hood switch but it seems that the detection algorithm was more complex than that. Also, I think the cheat version reduced NOx emissions by having very aggressive EGR settings which indeed do reduce NOx emissions a lot but will clog your intake manifold very fast if the fuel contains any sulfur.
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@ShaunieDale Oh, I would have assumed that doubling the power in software shouldn't have been possible. I thought that aircraft designs such as this had to be limited by mechanical strength. If that was the way that things progressed then Boeing engineers must have known for sure that they are breaking the rules when they doubled the effect.
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@nevermindmeijustinjectedaw9988 Self-regulation has been tried and it failed because of corporate greed, if I've understood correctly. The problem is that the engineers are not in the position to make the final decision about go/no-go for a borderline system like the Boeing MCAS.
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@madkills10 DPF will do random grocery shopping just fine as long as you drive long runs at least every week. If you don't drive the car that way you should not get diesel in any case.
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@nevermindmeijustinjectedaw9988 I mean that the idea that aviation companies would care about their reputation so much that they would self-regulate without FAA and never release products like MAX. It appears clear that the greed of the companies is too high to matter even if people die as a result of risk taking.
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@nevermindmeijustinjectedaw9988 You cannot default to self-regulating setup for critical systems if the best company seems to behave. For safety critical systems such as airliners, you have to set the rules according to worst player.
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@nevermindmeijustinjectedaw9988 Are you intentionally trolling? You are constantly taking the discussion to totally new directions and nitpicking. Maybe try starting a new thread if you think your message is important?
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@wizard_of_poz4413 Yes, carbon is enough to eventually clog but the sulfur make the process much much faster.
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@wizard_of_poz4413 Interesting. We have TDI with factory spec EGR configuration with 300k km on the clock and the intake manifold is barely blacked, definitely not clogged at all.
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@otm646 Yes, and if you look at the exhaust pipe, it doesn't get clogged even if it moves even more of the exhaust gases than the EGR valve. The problem with EGR valve is that the exhaust gas is met with air from the engine breather pipe and that combined with exchaust gases may result in clogging. It seems to me that this reaction is faster if the exhaust gases contain sulfur or other contaminants. That's why you should use high quality fuel. And in case of DPF, that engine breather pipe will transmit small amount of oil to the DPF and if that then reacts with contaminants there, you end up clogging the DPF, too.
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@youkofoxy I think Flight Control Laws are used only with fly-by-wire system. For Boeing, only 777 implements those if I've understood correctly. If that's correct, MAX doesn't have even the concept of flight law level.
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I think episode about all the stuff that resulted in Fukushima nuclear accident would be a nice one. The company had it coming for years.
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@wizard_of_poz4413 I don't understand what you mean by "vw takes exhaust off the dpf". DPF is in series with the turbo and catalytics converter which are all part of the exhaust system.
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Great episode. It's horrondeous that Takata intentionally withold information about the accidents.
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@jemmabean Driving would be much safer if all drivers followed the traffic rules for a start. Instead, they are intentionally selfish and in addition do additional tasks while driving such as using a smartphone. And if I've understood correctly, it's getting more and more common that bus drivers and truck drivers are watching sports TV broadcast while driving.
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