BEA...
"Thus, having identified the loss of airspeed information, the PNF turned his attention to the ECAM, undoubtedly in an attempt to refine his diagnosis and to monitor any actions displayed. He started to read the messages, and consequently called out the loss of autothrust and the reconfiguration to alternate law...."
In the prior paragraph, they reference a three second interval post a/p loss, and note the ECAM has not displayed the Law reconfig. It was sixteen seconds later the PNF called "Alternate Law".
Three seconds after the autopilot disconnection, the ECAM displays no information that is likely to point to a speed indication problem:
What is the point of This timeline, and the two time intervals? Thay mention the possibility of nose up, but make no inference other than, "possible confusion..."
The ECAM mentions a maximum speed that should not be exceeded but does not mention a minimum speed. This could lead crews to suppose that the main risk is overspeed. In the absence of any reliable speed indication, this might lead to a protective nose-up input that is more or less instinctive.
Sensory overload? The pilots? Or BEA? What a jumble...
Last edited by Lyman; 7th Aug 2012 at 00:51.