Welcome back SSG, we missed you....... Oops sorry whenrealityhurts.... now considering that you are qualified to fly the Hawker 400, I presume that you are going to follow the approved checklist for a Cabin Decompression... Look at item 9.... Cabin Pressure Source - EMER.
Now I presume that you do know how the EMER system works and the impact on the cabin?
I also presume that you know the available oxygen duration for 7 people, look at the Oxygen Duration chart in the AOM.
To be blunt with you, i enjoy these debates, you actually bring out some interesting view points regardless of what guise you are using. I enjoyed reading the Climb Gradient discussion and the previous discussion on Reduced Thrust, but you have to learn where to draw the line between discussion and being antagonistic.
Mutt