alt Hacker NewsThis was the partial cause of Air France 447.
Pilots were so used to "the plane won't make a mistake" that they were not aware/not trained properly about things that are nothing to do with the FMS like frozen pitot tubes and also that the autopilot has a number of "modes" which mean you need to go back to basics like altitude, attitude and air speed.
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p-e-w • today at 1:28 PM
If it’s true that other navigation systems are as safe and capable as GPS, then GPS navigation should be randomly disabled in every aircraft occasionally to ensure that pilots remain fluent in using them.
If it isn’t true, then the military is partially responsible for the crash of this aircraft.
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They didn't know their air speed (because of the pitot tubes being frozen). I think the report says that there was a path to safety if they had kept focused but it wasn't as easy as just flying the plane via 'the basics'.