Accuracy of the vane sensor = +/- 0.3 at 100kts.
Thanks, A33Zab.
Let's assume that the accuracy varies as the inverse of dynamic pressure, then it would be +/- 0.8 at 60 kts, and +/- 3.3 at 30 kts. Perhaps the stall warning computer could take those tolerances into account?
It may also be possible with the data from wind tunnel tests and AF447 to expand the airspeed indicating PEC (pressure error correction) table to higher AoA's, to reduce the IAS error at high AoA.