{New here - Hi to all
}
That initially "stuck" reading (according to the FDR) from AoA sensor #1 is interesting, isn't it. Presumably its output got voted out of being used, due to the discrepancy with the other two sensors, but the fact that it was different doesn't seem to be explained in the BEA report.
Originally Posted by
CONF iture
But Ice Detectors 1+2 didn't detect any (P110 EN)
Understood, but that lack of report from the detectors, doesn't prove ice wasn't present ("absence of evidence" and all that...), especially since there seems to be evidence of ice in that CVR noise noted by the BEA (page 73 English version).
What else could be the cause? Could the lack of report from the ice detectors be due to a different type of ice being present, than they were designed / able to detect? Being only a GA pilot, I have no idea how the ice detectors on an A330 work - any pointers?
After the logged AoA sensor #1 value gets "unstuck" from the 2.1deg value (thanks takata for that), at around 02:10:52, note that its value then gets "stuck" again for a while, but this time at a much higher value (> 40 deg) at around 02:11:45, when the other two AoA sensor values dip below 40 deg (page 107 English version).
My overall view is that there is a general "stickiness" to that sensor, and that's telling us something - whether it's affected by ice (of a type / amount / location not picked up by the ice sensors), or is a faulty sensor (lack of effective heating?), or ... ?
As I said, I hope the AoA #1 output wasn't being used due to earlier discrepancies, but I haven't seen that confirmed anywhere (I'd be very happy to be corrected on that!).