Mad Jock post at 1158 hits the nail on the head.
Tim Allan's observations / article about loss of power must now be critical reading and teaching to turbo prop crews.
I found, if memory serves, that zero thrust on Saab 340 is about 30 TQ.?
No doubt DB6 will keep me right !
Therefore any torque less than this zero thrust setting will create DRAG, and must be dealt with without delay.
Must be included in the simulator as a teach and practice. Auto feather failure is difficult to deal with even when you know it is on the agenda. Control and secure practice is essential.