Originally Posted by
LowObservable
What EASA was saying during most of the fall was that the solution was a third AoA vane. Hopefully, Boeing has had a Team B working on exactly that, including a retrofit kit that can be installed in 15 minutes using a Leatherman and a Dremel.
On the other hand, the information that has been shared* about what B is actually doing says that MCAS 2.0 will use only the two existing vanes, together with both FCCs operating simultaneously, and logic that disables MCAS (and perhaps other automatics) on disagreement. I don't think they're working on a third AoA sensor solution, although that, fairly obviously, would be the right thing to do if you were starting from a clean sheet for MCAS.
Of course, if you were actually starting from a clean sheet, it might be a good idea to design an airframe that didn't require MCAS.
*
Boeing's Fix Tames the Tiger . . .