The base salary is grouped in brackets of Max Take-off weight, as iPahlot said.
UTBNI ("Up to but not including") 3360 kg ($45,201) is right for a Chieftain I think, and the next tier (3360-5660kg, $47,001) for a C404 or Conquest or KingAir.
If you are employed by a regional airline, you will be paid in accordance with Schedule C - that's the only section that nominates any particular type.
If you are in Charter or instructing you get the MTOW groups - Schedule B - page 43 of the current award dated Nov 2014.
Sleep well
