Total red herring question probably, from a Concorde AFCS ancient.
When the air data part of an ADIRU goes 'belly-up' (in this case because of UAS) does that mean that the possibly still valid data such as altitude and vertical speed (static pressure data only) are also thrown out with the bathwater, or are there separate 'flags' (F/Ws) for separate data such as IAS, Mach, TAT, Alt and VS ?
IIRC, on Concorde all we (i.e., the AFCS) got from the ADCs was an ADC (1 or 2) failure warning. Period.
The AP and/or AT would drop out from internal command/monitor discrepancies between the ADC data, and in most cases also on an ADC F/W.
Since the INS was a totally separate system, it didn't really enter into the air data "discussion".
For clarity I should maybe add, that, for various (mostly irrelevant) reasons, between Concorde (the first FBW airliner....) and A320, the separate ADS (air data system) and inertial reference system (IRS) ended up inside the same system/box, now better known as the ADIRU.
Last edited by ChristiaanJ; 6th Jul 2011 at 17:03.