....
Planes fly nicely unless they are either -
- commanded to do something else; or
- upset by external factors; or
- the fundamental stability of the toy gets upset.
......
I like your writing style, full of subtle references to past happenings, as discussed on PP.
Your list of conditions does suggest something "permanent", IE mechanics, though the issue with fundamental toy stability can also be something intermittent. Where mechanical items either work or break, electrical/electronic/software items can easily show intermittent behavior. IE, upset, working again, upset, working again, etc. For MU5735, the FR24 data does show a severe upset, a temporary recovery and again a severe upset, suggesting an intermittent issue with the aircraft.
Of course, FR24 data is not perfect, though it was good enough to determine on PP, what potentially happened with SJ182.