[FtrPilot]

I would have thought that when they modified the plane and had an angle of attack indicator one one side they would have jumped at the opportunity of having another one on the other side of the cockpit...

All Boeing 737 aircraft have 2 AOA sensors. The issue is the MCAS architecture where MCAS only receives data from one AOA sensor at a time. If that sensor malfunctions, MCAS has no way to determine that the sensor has malfunctioned and reacts to the AOA data being provided by the sensor.

The safety features that were extra cost options are AOA display on the PFD (see pic below. It's the gauge to the right of "CMD" with a readout of 5.2) and "AOA disagree" warning message.

I still don't know why Boeing made these extra cost options.

[Capt. Tom]

All Boeing 737 aircraft have 2 AOA sensors. The issue is the MCAS architecture where MCAS only receives data from one AOA sensor at a time. If that sensor malfunctions, MCAS has no way to determine that the sensor has malfunctioned and reacts to the AOA data being provided by the sensor.

Thanks for the info.

Still, what is the point if they are both not hooked up?- Tom