I assume that this form is dynamic and you will not know which page the equipment type is on. I woudl recommend that you put a small field (make it 1x1 pixel, with no borders and the same color as the background - this makes it nearly invisible) at the beginning of that section. This field can act as a bookmark. Now when the user makes the selection on the dropdown you can set the cursor in this field programmatically and the form will jump to that location. The beauty is that you do not need to know what page it is on as the field will move with the section no matter where it is. Make sure that you give those bookmark fields unique names.
The code to jump shoudl be on the exit event of teh DDList and the code woudl look something like this:
xfa.host.setFocus("Name of Field to jump to")
Paul