Thanks BB, should've said that its FS2002 I'm running. I generally fly the 172, so would making an input to aileron trim via the keyboard or a joystick assignment work despite there not being aileron trim on the a/c panel (i.e does FS know that this a/c doesn't have aileron trim and so would it continue to make an input?) Also I take it that if I trimmed it then saved the flight the trim setting would be saved thereafter as with elevator trim?
Thanks very much, I'll also try avsim.