Originally Posted by
krismiler
We have 3 artificial horizons in order to have a tie breaker if 1 goes wrong, same with the air speed indicators and usually IRSs. I can't see how 2 AoA sensors will meet requirements if 1 starts acting up. Boeing may have to come up with a completely new stall avoidance system, even if it means recertifying the aircraft as a new type and requiring pilots to obtain a new rating.
Exactly, that's why Airbus have three, it's logical......but wait it costs more money!