Ever heard of a "paperless cockpit"...?? One pilot still has to have hard copies of EVERYTHING.Well,at least during certification that is....(which may be anything from 6 months to 36 months incidentally!)
Having instructed a few thousand hours on a dual HUD mid jet(with certification for single HUD use only at any time by the way),all I can say is......same principle applies! The certification authorities just are'nt comfortable with dual "non redundant" systems being used during 'critical phases' of flight.
Think about that.......
