is it really fit for purpose in that case?
Surely AW could come up with a software fix for that instability. I had heard that phase 4 software reduced that pitch instability a bit.
As far as I know / understand this is not a software issue but the pitch actuator is not good enough. The phase 4 software helped a bit but the AW189 still suffers with pitch instability. Don't know how much recertification if they replaced that actuator would be required but I don't think it would be easy / quick / cheap to do.
Fit for purpose you ask, well that is debatable but remember the government "stipulated" the AW189 for this contract to help keep Yeovil going, if I'm not mistaken.