[DanieI]

> Eight minutes after takeoff, two of the angle-of-attack sensors froze at the same pitch.

If it's typical for the sensor's data to vary from 30.00 to 30.99 degrees as the wind passes over the wings and two sensors are permanently frozen at 10.42, after 8 minutes I think that there might be a high enough probability for the computer's software to decide that two sensors are broken and one is working.