Just wondering if anyone can help me confirm once and for all as to whether the saab 340 has a critical engine.
Yes, it does. The SF340 does
not have counter rotating props. (This is why the yaw trim is set to 1.5 units to the right for takeoff.)
Can't find anything in my manuals right now, but here is a clip that should illustrate it well enough for you-
http://www.youtube.com/watch?v=IYee2SCM8a0