From what i understand, the Link props fly the Cat C approaches, i know eagle does this, except into WR.
Re: Eagle - correct all approaches are Cat C except any circling approach (Cat B unless ATC advised otherwise) and the WR approaches.
Mt. Cook use Cat B and C as required but generally work on the premise that the ATR is a Cat B aircraft. I've heard they are going to get it re-categorised as C because in a lot of conditions i.e. icing & high landing weights the min approach speed can very close to or even be higher than the max speed for Cat B Final Approach and Circling speeds.
S2K