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An Air India A320 lost key flight controls for four seconds during a 300-foot drop on a Phuket-Delhi flight, after all three hydraulic systems failed. The captain tested positive for marijuana, though no link to the incident has been established. An Air India Airbus A320 that dropped about 300 feet on August 4, injuring 24 people on board, briefly lost key flight controls after all three of its hydraulic systems failed, according to a preliminary Airbus analysis. The incident occurred on flight AI2379 from Phuket to Delhi, which landed safely despite the altitude loss. The Hydraulic Failure Sequence According to the Airbus analysis, the aircraft's three hydraulic systems green, blue, and yellow failed within seconds of each other. The elevators and ailerons, which control pitch and roll, were unavailable for about four seconds. The autopilot disconnected, and the first officer applied a full nose-down input, but there was no direct response from the flight-control surfaces until the systems recovered. "Elevators and ailerons surfaces were lost for around 4 seconds," the Airbus report stated. Investigation and Root Cause Airbus has not established the root cause but has asked ...