Hi,
If the loss of valid speed data has been the main factor in this accident (ie. leading to this kind of chain of events: pitot ice in all probes -> all ADRs out -> at the same time encountering a patch of warm air (that made the ice buildup possible in the first place) and thus thinner air, placing the acft a few thousand feet higher (aerodynamically) -> speed marginals decreased considerably -> combine loss or airspeed data, AP, A/T disengagement, performance degradation due to warm air, and possible lower airspeed at the onset (to penetrate turbulent air) -> aircraft approaches coffin corner and very quickly ends up in a high altitude upset / stall because piilot unable to keep speed on the safe side regardless of proper CL PWR + 5deg ANU procedure.)
Consider the above for a moment.
Now my question is: Would the backup speed scale (Pg. 19 ->
http://www.smartcockpit.com/data/pdf...able_Speed.pdf) have been complately reliable in assisting dealing with triple ADRs inop and flying without any kind of speed information available? As it's providing guidance through AoA, it should be reliable, but does anyone know if the AF jet was equipped with BSS ?
rgds,
Tero