Originally Posted by Graybeard
Robin42, there is also the TCAS Fail report, which BEA could not explain.
Yes, and the rudder limiter case, which otherwise had been tied to the missing airspeed, as it would be reasonable also for TCAS, assuming it needs at least altitude information, normally both provided by the ADIRUs.
But, as I understand your point, there are several electrical busses, and without a circuit diagram at hands you would not assume you had more HF than power on all these different circuits.