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And they have an history with FBW-caused accidents.

Especially AF296 killed 3 people when they try to demonstrate the anti-stall capacity of the FBW during an airshow. Airbus modified the way the fbw control reclamation worked after this. After the Rio-Paris accident (forgot the flight name, it was AF too), they changed the way the degradation worked wehn sensor fails (i think now 3 different mode exists, and information is more visible).

Those incident killed people, and there is a chance that the first one was actually caused only by the manufacturer (the second one was 99% the pilot though, the remaining 1% was: better information, better sims and better gradation so that even new, tired pilot can't make this kind of mistake).

There have been plenty of accidents involving the failure of old analog control systems too.

FBW adds cyber-related failure modes, but it is hard if not impossible to make the traditional hydraulics, strings, springs and pully-based systems resilient against failures since the number of things you have to duplicate explodes exponentially.

That AF 296 was caused by FBW is more of a conspiracy theory than anything else. Even if it were true that the pilots applied TOGA power a few seconds before the investigation concluded they did, they were still flying way too low with engines at idle. Poor planning, pilot error.

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