[cjbprime]

There's already two AoA vanes mandatory on every plane (even non-MAX planes). There is a warning if they disagree in the optional package that the North American airlines bought, but not any other airlines. The warning is not much of a warning, just a disagree light. It would have been impossible for the Lion Air pilots to benefit from this disagree light, because they didn't know that it was hooked up to a control surface and neither did any other pilots, it seems.

> The planes seem eminently airworthy

An uncontrolled nosedive caused by a single sensor failure is not in anyone's definition of airworthy. It must be fixed. This lack of airworthiness was not the pilots' fault.

[dingaling]

> There's already two AoA vanes mandatory on every plane

And all Airbus types have three or four. Boeings only have two, even on the 787 ( on which one is vulnerable to damage from jetbridges ).

It is disappointing that a manufacturer would cut corners on sensors for a $100 million aircraft.

[WalterBright]

Airbus needs more because there's no mechanical backup to the flight control computers.