familiar
RedB,
This is exactly the same symptom as described to me on a B3 close to home. Fluctuating torque. I cannot remember the specific problem, I will make some enquiries. As far as I remember it was something like the freewheel unit or maybe something off the accessory gearbox (e.g Starter/ Gen) that caused the fluctuations. It was potentially very serious so I also suggest no more flight until resolved. I will post more if/when I find out some facts for you.