2009-06-01
Air France
Flight AF447
Departure
Galeão International Airport, Rio de Janeiro, Brazil
Destination
Charles de Gaulle Airport, Paris, France
Causation Breakdown
Human factors
The flight crew failed to correctly diagnose an aerodynamic stall and applied continuous nose-up inputs throughout the descent, counter to recovery procedure. Inadequate training for high-altitude manual flight at automation disconnect was a systemic contributing factor.
Technical factors
The Thales AA pitot probes were known to have icing susceptibility at high altitude. Their simultaneous failure caused the autopilot to disconnect and presented the crew with conflicting unreliable airspeed indications at night over open ocean.
Recurrence Likelihood Today
Low
The specific pitot probe model has been replaced across the Airbus fleet. Upset Recovery and Prevention Training (UPRT) is now mandatory globally. However, the broader issue of pilots losing manual flying proficiency in highly automated cockpits remains an active concern within the aviation safety community.
Summary
AF447 disappeared over the South Atlantic during a night flight through a storm system. The flight recorders were not recovered until 2011, two years later. The accident exposed critical gaps in pilot training for high-altitude stall recovery.
Cause & Investigation
Determined cause
Pilot error following instrument failure
Ice crystals blocked the pitot tubes, causing an unreliable airspeed indication. The autopilot disengaged and the crew responded incorrectly, pulling the nose up and stalling the aircraft at high altitude. The stall was unrecovered.
Investigation body
Bureau d'Enquêtes et d'Analyses (BEA), France.
Timeline & Safety Improvements
Flight AF447 disaster
Airbus A330-200 operating for Air France. 228 fatalities, 0 survivors.
Formal investigation opened
Conducted by: Bureau d'Enquêtes et d'Analyses (BEA), France.
Cause determined: Pilot error following instrument failure
Ice crystals blocked the pitot tubes, causing an unreliable airspeed indication. The autopilot disengaged and the crew responded incorrectly, pulling the nose up and stalling the aircraft at high altitude. The stall was unrecovered.
Improvement implemented
Airbus and regulators mandated replacement of Thales AA pitot probes with improved models.
Improvement implemented
Upset Recovery and Prevention Training (UPRT) became a mandatory part of pilot training.
Improvement implemented
Revised procedures for handling unreliable airspeed situations were issued and standardized.
Improvement implemented
Improved crew resource management training for high-altitude emergencies.