one auto pilot engaged at altitude, all that triple redundancy is for approach and auto land.one a/p one adiru feeding it.
Interesting.... Boeing 747-400 autopilots use a single ADC as a source of (autopilot) data, but use all 3 IRU's as a source of information at almost all times (not just for landing). If all three IRU's are giving different data, then a "mid value" is chosen (not "average", as a wildly erroneous value would affect the data too much).
On an Airbus, even if one ADIRU is plugged into the A/P, wouldn't there be data sharing via databusses to that ADIRU? (if not for "ADC" data such as AOA, then, say, IRU data, such as attitude?)
I'm also wondering how aircraft computers process "spiking". Obviously the spiking on this particular aircraft was not large or rapid enough to be considered ridiculous and the value rejected.
Just curious.
Thanks.
NSEU