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I work (or worked) in a safety critical part of the industry, the issue is often some kit that returns because of a fault can't be repaired as the Hardware is obselete and we can't replace it more modern replacements as it has changed so much either it's incompatible or too fast. My solution was very un PC when we had a bit of mission critical hardware buy three sets of hardware for each item, OK you have to store it and pay for it, but you can fix it fast and turn around is hours not months...
I have been using analog equipment as well, that gradually built up some charge that had to be discharged by turning off the power for ten seconds to let it discharge.
My current LCD screen is not 100% analog. Sometimes, at large contrasts (like a white windows against a dark desktop) begin growing flickering "hair" to the right of the contrast line. A dozen or two scan lines at various vertical distance flash white for 1-5 cm. This doesn't go away, but gets increasingly worse over time, until I turn off the power to the screen for at least 10-15 seconds. I am quite sure that the cause is some charge build-up, and has nothing to do with software.
Lots of modern electronic products never turn completely off until you physically pull the plug. Maybe not even then: They have battery backup.
Ten years ago, it was not uncommon to store setup and configuration in CMOS, which draws very current, but requires the voltage. In recent years, flash has largely taken over, but maybe older designs still use CMOS. But in most cases, the essential thing running is a real-time clock so that it can display the time, or e.g. perform programmed functions at a given time of day, without requiring the clock to be set whenever you turn it on.
Your proposal that it could be related to a millisecond rollover already suggests that the problem could be related to some clock function. Maybe there is in the plane some clock running even when it is powered down, just like on your stereo or microwave or the dashboard clock of your car.
For the 49.7 vs. 51 days: I noticed that 49.7 * 1024/1000 = 50.9 days. I suspect that it has to do with that, but have no proposal for how this could have affected things. It would be easier to explain it if it was the other way around, that the time was reported to be 49.7 * 1000/1024, because some computer guy our of old habit divided by Ki rather than by k
Anything that is unrelated to elephants is irrelephant Anonymous - The problem with quotes on the internet is that you can never tell if they're genuine Winston Churchill, 1944 - Never argue with a fool. Onlookers may not be able to tell the difference. Mark Twain
The company I work for at the moment has decided to make the role I (and another) were doing redundant. Dang not unexpected but I on the quiet could see this coming and had lined up some interviews, one which sounded hopeful after the telephone interigation wanted to see me for a face to face put all interviews on hold. I have another telephone today. I was after some idea, is there a chance I could a solid offer purely from phone / Skype contact?
Well I had the first interview / grilling with my Bosses Boss and told my role was being made redundant. Last time this happened I left in the Pub so long it was not funny, I made a promise to myself it wasn't going to happen again. Then Convid-19 happened and put a stop to the interview process (had a couple of good leads!) and then the axe gets dropped whilst in the midst of Convid-19
I saw a talk by Martin Lewis the money guy on TV the other day and he has said that if a company tries to make you redundant or just tries to get rid of you over this virus just ask them to put you on furlough as it won't cost them anything and you will have a chance to find (or try to) something without worrying too much about money.
I should imagine there are a number of companies' share prices "down the pan" at present, but furlough is nothing to do with share price, it's all paid by the government, it wouldn't cost your employer a penny!
And if they won't furlough you then you are really better off out of it, the trouble is however if you are out of a job you'll struggle to find a new one whilst all of this mess is going on unless you get one in a "critical" sector or whatever they are calling it.