Reg C Elley says:
"I don't think that accepting whatever it shows in flight is likely to be of much assistance as it may well give you an attitude markedly different from the optimum IFR speed. Again this is type dependant."
Perhaps I should expand a bit as to my intended meaning. In my case, for example, some of the older 76s I've flown had ADIs with an adjustable sphere inside. Auto-levelling features notwithstanding, I could trim to an airspeed then reset my horizon to indicate level at that airspeed.
In the EFIS equipped aircraft I am now flying, this is not an option. What the ADI shows me is what I have to work with, if this means straight and level flight but with 2 or 3 degrees nose down, then so be it. I have other instruments to help determine if I am truly level.
If resetting the ADI once in cruise makes one feel better that's fine, it still won't change the actual attitude of the aircraft and may well lead to a false sense of fuselage postion.
