Hi CONFiture,
Originally Posted by CONF iture
Where do you get that certainty of a triple ADR fault from ?
To the contrary, Low and High Speed Stabilities may well have been available.
Quite simply if, at any point, you've got 3 valid ADRs and a failure makes those 3 ADRs to be rejected by all PRIMs and Autoflight System (AFS)... it will certainly be called a triple ADR fault. That is what happened starting at 0210:05, in all certaincy (this is also stated as a fact from the 1st BEA report).
This relevant fault was: PROBE-PITOT 1X2 / 2X3 / 1X3 (9DA).
Its meaning is quite clear: total pressure was out of boundaries and different at each probe-pitot source (9DA1, 9DA2, 9DA3) and the following consequences are well known on ADRs output channels as well as with other systems (A/FLT, F/CTL, NAV) using those values.
Hence, from this point, ALT2 without valid airspeed/Mach and SPEED LIMIT FLAG on PFD make it quite certain that Low and High Speed Stabilities were NOT available.
Originally Posted by OK465
However, you do need to experience complete AC electrical failure to get there.
Of course, you are right about that (batteries). The above quote sumarizes precisely what I meant by "complete [AC] electrical failure".