ok , i have vista home premium sp2 64 bit.as soon the plane has power and bus switches are on auto , then i need to open the x cross fuel valves , and the bleed air ilsn valves.these valves plus the apu bleed air valve are bugged after take off or after climbing or engine start.olso if i have to assign buttons or key strokes for fsx apu start apu off and starters on/off , becose if i shut down the plane, the starter valves seems to have a bad habbit. olso i start with external power , becose the apu seem to go wild after some time. the temps stays rizing of the apu egt and shut the apu down then the temps keep dropping to endless - 0 degrees. so this plane has no apu and need to be started by ground power , for the rest , navigation and programing fmc and flying, itsan awsome plane. olso the starters valves to start the plane are awsome , you have to click them in several ways depends on how you start the plane, electric, bleed air , or in flight or auto , just like real.