takata & Graybeard,
Lets assume for a minute (I say assume), the scenario that Graybeard has proposed is correct, e.g., the AP is attempting to correct for an erroneous reading of higher speed by pitch up. Would, at the same time, the AT functions begin to roll back thrust (N1)? I assume the ECU or FADEC would be receiving the same erroneous speed data and react accordingly. Once out of AP & AT and without correct knowledge of airspeed, one would have to reset both pitch and engine speed manually using the tables for a 35K altitude, wherever those table might be in the cockpit at the time. So then, I wonder how long one has, without correction, to reach a stall point from which recovery becomes difficult or problematic.
Just some curious questions. takata, thanks for all the charts and data you posted.