Paul,

 

You are not imaginative enough! See my earlier post. There are electrical failures that will take down your entire electrical system. Hamid is the expert on that subject. I would defer to him.

 

Jeff

If you have a total electrical failure with an electrically dependent engine (Dual LSEs) you need not worry about multiple EFISs (EFII?) because you flight path vector is down.  If you lose your instruments but keep your motor running you will also lose the electrically dependent backup gyro or T&B--so unless you are advocating a return to vacuum I see no advantage to a round artifical horizon vis a square one.  And if you are confused by a disagreement between gyros then I suggest you monitor the performance gauges to sort things out.  Having survived hundreds of hours in real wx with a only a J8 attitude indicator and a needle ball in a single pilot jet with no autopilot I think we lose sight of the elegance of simplicity as we search for zero risk.

paul LIV N94PT