I have a copy of an AW-USA presentation for ICAR (75Mb!) that is aimed at SAR and EMS. It reads as follows.
Light transport category - 4.5 tonnes / 10,000 lbs class - 1/2 pilots / up to 10 pax.
Elsewhere in the family archives, the 189 type cert states 19 and the OEB Report states two passenger densities: 16 & 19.