One analysis blames failure to follow proper CRM procedures as being a contributing factor that led to the 2009 fatal crash into the Atlantic Ocean of Air France Flight 447 from Rio de Janeiro to Paris. The final report concluded the aircraft crashed after temporary inconsistencies between the airspeed measurements—likely due to the aircraft's pitot tubes being obstructed by ice crystals—caused the autopilot to disconnect, after which the crew reacted incorrectly, causing the aircraft to enter an aerodynamic stall from which it did not recover.[17]