Just hydralics, why no back up fly by wire systems
Unless fly by wire was not invented then, well a good reason to invent a fly by wire system.
The Concorde prototype had fly by wire and FADEC 10 years before this movie. It was essential for accurate supersonic flight. Bear in mind the control surfaces are still powered hydraulically just the command signal is electric. Fly by wire has its own problems.
Those giraffes you sold me, they won't mate. You sold me queer giraffes.share