I have to disagree Cabinboy. There is a requirement for 2 F/A's on the DH3. This is related to the capacity of the A/C, not the number of pax on board and there is no discretion to vary the number of crew.
We have 5 DH3's and I have never seen one depart without the full legal minimum crew complement, although we have on many occasions had less than 36 PAX both ways.
I'm sure CASA would like to hear of those occasions of which you speak.