Originally Posted by
Sunfish
I read it too. I’m particularly concerned about the ADIRU failure not being able to be replicated. that means either the hardware or software doesn’t have the right hooks in it for debugging. That means it’s a bad design that cannot be fixed, which is what I think Qantas must have concluded before replacing them.
BTW, Boeing is getting flak for still using an 80286 processor in the B737 FCC. I was told many years ago that they did this purely for hardware reliability reasons. I’m not sure what processor the failed ADIRU used, but leading edge processors have bugs that take years to discover.
Not at all.
Airbus logic is it it has three ADRs. It compares the data and if one is found to be outside of limits via a statistical algorithm, it discounts that source and goes with the good data.
The flaw was two ADRs were giving the same faulty data, so it discounted the good data of the single non malfunctioning unit, the flight protections kicked in and acted on the bad.
The fastest way to regain control of an airbus is turn 2 ADRs off. A lot of people say 3&1. My personal preference would be the PNFs and the backup.
If it gets away from you, three off and fly the BUSS.