Originally Posted by
weemonkey
Hmm. So a direct reading gauge with nothing getting in the way.
Apart from the cabin diff press indicator tap.
So not totally independent after all...
Cabin diff press indicator has no influence on ISFD IAS shown.
Some sophisticated numerical compensations that are done inside ADM and ADIRU are missing, as for AoA. But these are not too relevant for normal manoeuvering. All non digital airplanes have flown well like this for decades.