@HN39:
Accuracy of the vane sensor = +/- 0.3° at 100kts.
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About the FMGEC voting logics:
The FMGEC uses different logic to compare the inputparameters.
The logics used are by voting, passivating or two by two comparision and/or a combination of those.
For the airspeed (considered as slow changing parameter) the two by two comparision is made on the (ADR) monitoring side of all 3 sources (ADR OWN, O3 and ADR OPP-osite), the result of this is passivated to the command side which only receives parameters of ADR OWN and ADR #3.
(the command parameters are following the selection of the ADR source selector however will revert to the good source if the selected source is considered not to be good, as it was in AF447 between 02:10:46 and ~02:11:07.
Already said before it is rather complicated, one parameter may pass the logic while an other parameter could 'reject' the ADR as being unreliable.
The two by two comparision example:
