BOAC, Will;
I'm examining the fault message at 02:13:14:
"- .1/FLR/FR0906010211 34123406IR2 1,EFCS1X,IR1,IR3,,,,ADIRU2 (1FP2),HARD"
I know that the "IR1,IR3" messages are "identifiers" and that "IR2", a Class 1 fault, is the "source" of the original message. What I am searching for information on is the meaning of the IR1 & IR3 messages. I know there weren't "radar" messages as part of the 25 messages received but we know that there is a possibility of missing messages. For example, the CMC records only six "identifiers", (related systems); if there are more, they are lost. The BEA report also states that the messages are not necessarily received or displayed in the order of the equipment faults. I am pausing to consider the loss of 3 IRUs.
Will, yes, the radar is IRU-stabilized.