Fairchild SA227DC Metro 23 = Cat B
and
This won't be very helpful but different Australian operators operate the same types in different catagories.
Good Point! For Example, REX operate their Metros to CAT C criteria.
Kendell used to have them in CAT B, and the SAAB340 was also in CAT B, but was in CAT C when One Engine Inoperative.
Whilst CAT C is, generally more restrictive (can't descend as low as a catA/B A/C) the Metro, for example, handles a lot better at the higher speed in the approach.
And CAT-H is, of course, Helo's.