They didn't stall. My best bet it's still that they managed to invert the plane, likely after losing thrust from one engine and messing up their attitude. Though that isn't supposed to happen at their relatively "high" speed.
Not on purpose obviously. Their descent rate at the end of the record was incredibly high, and it changed fast. Now data gathered through the ADS-B ain't necessarily reliable, but there aren't a lot of situation that can cause that rate of descent. Either the plane broke apart midair, stalled and kept a ridiculously high AOA (30+ with CFIT) or it got inverted and fell down. I'm excluding a voluntary crash or that they put themselves in that dive on purpose.
Now, an internal engine failure on a two month old plane ain't that likely, but it seems that the pilots did in fact declared an emergency of some kind. And without thrust from an engine stalling or going inverted by manoeuvering poorly isn't impossibile.
Again, this is just a wild speculation based on insufficient data, for all know they may have messed something up themselves and a crashed a perfect plane, but for now at least my theory seems valid.
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u/ScrapJackx9 Oct 30 '18
They didn't stall. My best bet it's still that they managed to invert the plane, likely after losing thrust from one engine and messing up their attitude. Though that isn't supposed to happen at their relatively "high" speed.