Unlike fly-by-wire Airbus's and Boeings, can non-fly-by-wire Boeings also implement auto-pilot based "assisted recovery" functions related to the Enhanced Ground Proximity Warning System (autopilot "takeover" of pilot control to avoid Controlled Flight Into Terrain), without physically modifying the aircraft?
Reportedly, fly-by-wire aircraft only require FMC software modifications to implement this "assisted recovery" system, but it would seem non-fly-by-wire B757s and B767s for example, would also require physical modifications to the aircraft to allow an autopilot system to interrupt pilot control.
True?
Thanx
