Xeptu,
Thanks for the in-depth tech info.
Can you see anything from the FDR trace that indicates this as a possibility? From my (admittedly, non-type-expert) analysis, I can see little wrong with either engine prior to the #2 autofeather.
...which leads us back to the first of my '2 mysteries' postulation above... Why did the #2 autofeather, and what triggered the 'flameout' detection when the engine appears not to have flamed out at all?
I would also be very interested to know what type / company SOPs are with regards to a/p engagement - were they likely to be hand-flying, or relying on the automatics?
I ask because from experience, I cannot fathom how a misdiagnosis of which engine has failed can occur in a twin TP that is being hand-flown.