Air India A320neo Flight Control Systems Briefly Failed Before 300-Foot Plunge Injuring 24

An Air India Airbus A320neo operating flight AI-2379 from Phuket to Delhi experienced a sudden loss of flight control system functionality on August 4, leading to a rapid descent of approximately 300 feet while cruising at around 34,000 feet altitude. The event left 24 passengers and crew injured, many with serious head, neck, and spinal injuries after being violently thrown about the cabin due to the unexpected maneuver. The aircraft involved was about seven years old, underscoring concerns about system reliability even in relatively young airframes.

According to an internal report from Airbus reviewed but not independently verified, the aircraft’s flight control system, specifically those that govern elevators and ailerons, went unavailable for roughly four seconds during cruise. This temporary blackout caused the aircraft’s nose to pitch upwards. The First Officer attempted to counteract by pitching the nose down, but initial control inputs failed to correct the flight path immediately because of a concurrent loss of hydraulic system functionality. The combination led to the brief but significant plunge.

The incident remains under investigation by India’s Aircraft Accident Investigation Branch (AAIB), with cooperation from France’s Bureau d’Enquêtes et d’Analyses (BEA). Officials have not yet determined the root cause of the flight control system failure or the hydraulic issues. The event adds to growing scrutiny over flight control software and hardware on Airbus A320 family aircraft.

Last year, Airbus issued an urgent safety alert regarding the A320 family after a JetBlue flight experienced an uncommanded pitch-down due to a corrupted Elevator and Aileron Computer (ELAC) unit. Airbus believes intense solar radiation corrupted the ELAC unit’s L104 software version, prompting a rollback to the prior L103 version to restore safe operation. While approximately 11,500 A320 series aircraft are in service globally, only about 6,000 had been updated to the problematic L104 software, making the software version a critical focus in recent incidents.

The ELAC units are integral flight control computers that process pilot inputs to manage aircraft elevators and ailerons smoothly and precisely. Malfunctions can lead to uncommanded pitch or roll changes, compromising flight safety. The Air India incident has raised concerns that similar software or hardware vulnerabilities may be involved, although Airbus has not publicly confirmed a direct connection between the software issue and this event.

In a related development, the Captain of flight AI-2379 failed a second drug test following the incident, testing positive for cannabis after an initial rapid screening showed a non-negative result. Both the Captain and other crew members undergo mandatory drug testing after serious safety incidents. Authorities have stated there is currently no evidence linking the drug test results to the flight control anomaly or the safety event itself.

This incident underscores the complex interplay between aircraft automation, flight control system software, and human factors in modern aviation safety. As commercial fleets increasingly rely on sophisticated avionics, ensuring the robustness of flight control systems against hardware failures and software corruption remains paramount. The investigation’s outcome may influence future regulatory and manufacturing practices surrounding flight control software and hardware.

Air India and Airbus face significant pressure to fully understand and remedy the factors contributing to this sudden loss of control during cruise, as over a thousand passengers regularly travel daily on A320 family aircraft worldwide. The aviation community awaits detailed findings to better safeguard against similar in-flight anomalies.

The ongoing probe will need to clarify how the system failure unfolded, the interplay with hydraulic loss, and the efficacy of pilot response in managing the event. Meanwhile, the incident already serves as a cautionary tale on the critical importance of maintaining software integrity and stringent crew fitness standards in ensuring the safety of commercial air transport.