Although there’s not yet much known about the simulated systems, one thing we know for sure and that is ……. many or perhaps even all aircraft systems will be simulated in great depth. You don’t believe me or you think it’s impossible? I remember that for Microsoft Flight Simulator FS9 and FSX there was an Italian developers group named Leonardo SH. They had developed one of the greatest realistic simulations of the MD-82. Anyway, check out this A.T.S. APU start movie.