Redundancy, or replication, is of less use in critical systems than parallel but anomalous systems. BA038 satisfied all ETOPS requirements, but in hind sight and to this day, critical systems tend to replicate each other as the destination of each system is approached, rather than continue to supply, meter, or control critical systems in independently engineered ways.
Taken to an extreme, BA 038 could have been fitted with separate but similar powerplants, ie. one GE and one Trent. As silly as it sounds, it represents what I feel is a neglected discipline.
Redundancy depends on reliability, and as we know, in Aviation, reliability is a frequently "balanced" consideration.
If one device has a freckle, two more will also. In 2003, Thales researched and recommended a separate sensing system for airspeed.
mm43
As the RTLU was found in its Normal Law setting, what is the implication regarding travel? Was the Rudder free to travel stop to stop, was it pinned in a centered position? Etc. I am extremely impressed with your contributions to this thread. What of the initial reports that bodies were recovered in "two separate areas, separated by fifty miles?" What do you make of the found positions re: VS, Galley, wing bits, aileron, Elevator, Spoiler, et al?
bear