If Mach12's info is indeed correct the Q I have is why the hell are these events occuring, why would anyone attempt to move a power lever below Flt Idle in flight???
The turboprops I flew with TPE 331's required a deliberate lifting of the locking levers to go back into beta range. It was impossible to accidentally move the levers below the Flt Idle stop without doing so.
Does the Dash 8 have a similar setup??