In the airline world, PIC's are not generally assigned to more than one "type"of aircraft. Are there similar rules in the bigger coporate flight depts? For instance, if your flight dept flies Lear 24's and Lear 55's, can you be PIC in one of them one day and in the other the next day? If you fly Falcons for your corporate flight dept, can you be assigned to fly just one model, or can you fly all? Is it somewhat dependent on what different "types" are covered under one type rating? Can you fly anything you are type rated for? How "many" types is the max? For bigger flight depts with helos and jets, is it common to find a PIC assigned to both? I know this probably varies somewhat from dept to dept, but I'd like to hear what some of the different experiences are, and the reasoning behind them.