That would be Airbus flight controller - concern was over their new by then fly by wire control system so this was used. The US Space Shuttle had the same conc

That would be Airbus flight controller - concern was over their new by then fly by wire control system so this was used. The US Space Shuttle had the same concept with 4 computers that ran on the same codebase and hardware from IBM that would check each other on critical components (engine burn/flight control) and if one differed it was voted out. There the issue was radiation induced memory corruption as the software was top tier tested and verified to be bug free as possible (they used ADA)