final report presentation - bea...final report presentation author bea subject accident on 1st june...
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FINAL REPORT
Accident on 1st June 2009to the Airbus A330-203operated by Air France flight AF 447 - Rio de Janeiro - Paris
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Sequence of events leading to the accident
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1. The temporary inconsistency between the measured speeds, following the obstruction of the Pitot probes by ice crystals
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1. The temporary inconsistency between the measured speeds, following the obstruction of the Pitot probes by ice crystals
Ice Crystals
MeasuredPressureMeasuredPressure
⇒ autopilot disconnection and reconfiguration to alternate law
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2. control inputs destabilizing the flight path
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3. The lack of any link, by the crew, between the loss of displayed airspeed information and the appropriate procedure
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4. The late identification of the deviation from the flight path by the PNF and insufficient correction applied by the PF
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5. The crew not identifying the approach to stall, their lack of immediate response and the exit from the flight envelope
6. The crew’s failure to diagnose the stall situation and consequently a lack of inputs that would have made recovery possible
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These events can be explained by the combination of these associated factors:
The feedback mechanisms of all of those invloved An absence of training, at high altitude, in manual aeroplane
handling and the procedure relating to speed indication anomalies
Task-sharing weakened by the startle effect and by incomprehension of the situation
Lack of a clear display in the cockpit of the airspeed inconsistencies identified by the computers
The crew not taking into account the stall warning
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New Safety Recommendations
Initial and recurrent training for pilots Aeroplane systems The feedback process Surveillance of the operator Launching SAR operations and wreckage localisation ATC
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