I'm doing the same thing right now. I also removed the inner phillips screws, and most of the Vulkum or Butyl (not sure which it actually is) If you have the owners manual their is a page about how to do this, but It's not really clear.
"Using wide base screw driver and protecting exterior with piece of wood, gently and slowly pry sash from frame. Pry only along vertical extrusion between wing window and center window. Inside butyrate tape will readily stretch"
This is under "Exterior Wing Window Removal and Replacement"
So I'm assuming that the two windows are not mechanical connected, other than by the inner screws. So according to these instructions, you should simply be able to pry the outer wing window out...
I'm going to go try this now.
Let me know if you found better info. I think I've seen it here somewhere. I wish we could somehow "favorite" members posts so we could build our own "how to" library for our projects!