Originally Posted by Machinbird
First upset was close to worst possible
scenario: 4 degrees alpha prot, 6 degrees anti pitch-up
Sorry for late reply, I was 'in transit'. Yes, that's the statement I was referring to. About 2.5 minutes later there was a second upset, in which the uncommanded nose-down elevator movement was 5 degrees. The report doesn't explain why it was less.
AOA processing algorithm using just two sensors only on A330 and A340
My understanding is that the PRIM's compare the output of the three ADIRU's for all parameters, not the sensors directly. For all parameters except AoA, the PRIM's use only one value, the middle (median) one, and monitor the differences to and between the other two values. In contrast with other parameters - "To calculate a value of AOA to use for calculating flight control commands, the PRIMs would use the average value of AOA 1 and AOA 2. In other words, (AOA 1 + AOA 2)/2."
regards,
HN39