If we take engines out of the equation , what is the failure rate of hydraulic systems and generators independant of engine failures ?. I can't think of any autopilot that will still function after a hydraulic failure and landing lights radios and gyros probably would not last long after a generator failure .I think a distiction also has to be made between Single and Dual pilot IFR .PS i'm not a pilot so you can't insult my flying ability LOL.