Originally Posted by
DaveReidUK
A spurious (uncommanded) auto-feather of both engines simultaneously would be really bad luck ...
It's far too early in the investigation to positively confirm on this. A double spurious auto-feather is not that likely, though the Taiwan crash did IIRC also have "only one" engine going into auto-feather. Enough to confuse the flight crew and subsequently crash the Taiwan ATR.
The Nepal crash also happened in a low-level/low-speed regime, so very little room to make mistakes, once "something auto" goes haywire. When a full power on the remaining engine is not immediately applied, the 20-30% reserve above the stall speed is energy wise lost pretty fast (a couple of seconds). Sinking starts and the natural tendency to pull-up completes the crash preparation into unavoidable.
Did this happen: I don't know, though it is certainly a plausible mechanism, this kind of accidents develop very fast from "normal" to "irrecoverably", especially, when "the other engine" is also feathered due to confusion.