It didn't happen. The actual 'airspeed' never 'dropped below 60 knots' only the ADR sensed airspeed.....
Fair enough, I should have specified
indicated airspeed...
.....Would you give them credit then for being at least 'semi-professional'?
No, not Bonin. What he did demonstrated a complete lack of understanding of basic aerodynamics.
Note that I spent ~40 years on the design side of things - and prior to AF 447, if someone had told me I had to design my system to account for an aircraft that was in air and was stalled so badly that indicated airspeed dropped below 60 knots (and with the PF taking no corrective action to get out of the stall), I probably would have laughed out loud...