(Auto)feathering the live engine?
I've recently heard of incident that happened to ATR. While investigation is still in progress, it seems that SCU1 failed immediately after take-off. TQ indication no1 went to zero but Np1, ITT1 and Nh1 remained at normal take-off values and eng no2 got uptrimmed. Fortunately, SCU recovered quickly so autofeathering did not occur. I wonder what would happen if ATPCS tried to feather engine that was still producing take-off power. My opinion is that it would load prop so severely that blades or hub failure would be inevitable but then perhaps I'm missing the part of the picture. Also I'd like to know if inadverent autofeathering ever happened before on any type of prop airplane and what were the consequences.
Many thanks for the replies.