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Air France Flight 447:
"...The investigation is increasingly focused on whether external instruments on the Airbus A330 may have iced over, confusing speed sensors and leading computers to set the plane's speed too fast or slow â€" a potentially deadly mistake.
The French agency investigating the disaster said airspeed instruments on the plane had not been replaced as the maker had recommended, but cautioned that it was too early to draw conclusions about what role that may have played in the crash."
this is probably not the right place for this analysis which might be totally wrong, but if your engines die and a passenger jet stalls because of very strong head on wings, it might lose stability (hence spin) especially if only one of the engines thrust was reduced (so thurst was asymetric). this could even lead to a structual failure in midair.
But what would a head be doing on the wings anyhow?!
Andy - I meant "winds" not "wings"...
"thurst was asymetric"
Ah, I missed that bit - maybe it just popped out for a drink, then...?