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Has it something to do with the priority button?
Clandestino
Yes. FO SS inop means capt's priority button pressed and held an v.v. There's also latch out if priority button is held long enough but given the traces, it wasn't the case here.
Thank you for confirmation.
Another bit i found in the FDR traces and i like to point to:
Look at Page 111 of the BEA 3. interim report second trace from bottom. It is the normal acceleration graph.
02:10:28 - 02:10:50 below 1.0g, average g is 0.8, peak value is 0.6
02:10:50 - 02:11:10 above 1.0g, peak is 1.2
02:11:10 - 02:12:00 below 1.0g, average is about 0.9, peak is 0.7
In the timeframe from 02:10:28 up to 02:12:00, where the elevators and the trim moved to full NU (ordered by loadfactor demand from SS), only 20 seconds from the total of 92 seconds had been with a loadfactor of 1 g and more. All the other 72 seconds the actual loadfactor was below 1 g, giving the crew the feel of unloading (which actual was reality!) and doing the right thing. The SS NU inputs in this phase could be explained as controling the unloading.
By the way, you will be amazed, how much the body can feel an unload from 1 g to 0.8 g.
I´m fully aware that most of this loadfactor was created by the increasing vertical component of the flight. Did the crew know as well?
I´m open to other explanations.
franzl