A method includes monitoring a current value (110) of a rate of reduction of torque of the shaft, providing a threshold value for the rate of reduction of torque of the shaft and generating a signal indicative of the shaft shear event when the current valu...

The method (20) involves determining (21) the actual bearing forces (8) of a turbine housing, where the differences from stored permanent bearing forces (26) are formed and are determined (22) as a sum of the differences of the torque (23). An output (25) ...