Originally Posted by
DaveReidUK
The 787 generates a synthetic airspeed value by combining inertial data and AoA, to substitute for UAS.
Whether you can do it the other way round, i.e. generate a synthetic AoA from IRS and IAS, isn't immediately obvious.
The B777 ADIRU generates a 'calculated AOA' based on inertial and air data. The calculated AOA is used as a third AOA value for AOA redundancy management. The AMM states:
The AOA redundancy management logic uses a modified average calculation. The modified average calculation calculates an average of three AOA values, the left corrected AOA, the right corrected AOA, and a calculated AOA. The calculated AOA logic receives inputs from the inertial and air data systems to calculate the calculated AOA.
I assume the B787 does something similar?