An Air India Airbus A320 experienced a dangerous but ultimately survivable loss of critical flight controls during an August incident, according to preliminary analysis from the aircraft manufacturer reviewed by Reuters. Flight AI2379, operating between Phuket and Delhi on August 4, descended approximately 90 metres when all three hydraulic systems simultaneously registered pressure losses, leaving the flight crew temporarily unable to operate essential control surfaces. Despite the loss of altitude and the injuries sustained by 24 people aboard, the aircraft managed to land safely in Delhi, averting what could have been a catastrophic outcome.
The sequence of events unfolded with alarming speed. Within a compressed timeframe, the aircraft's three redundant hydraulic systems—which supply pressurised fluid to operate flight controls and other vital equipment—all failed in rapid succession. This cascading failure prevented pilots from accessing the elevators and ailerons, the movable surfaces on the tail and wings that respectively control the aircraft's pitch and roll. For approximately four seconds, the pilots lost the ability to direct these essential control surfaces, a period during which the A320 pitched upward uncontrollably. The first officer, responding to the emergency, applied full nose-down input on the control stick, yet the flight control surfaces remained unresponsive. Only seconds later, pressure was restored to all three systems, restoring normal control authority to the pilots and allowing them to regain command of the aircraft.
Airbus's technical assessment, compiled in response to Air India's request for analysis, points to the simultaneity of the hydraulic failures as the defining puzzle. The rapid-fire loss of pressure across all three independent systems—which are deliberately designed to provide redundancy precisely to prevent such scenarios—suggests either a single point of failure in a shared component or a catastrophic cascade triggered by one system's failure affecting the others. The manufacturer has not yet determined the underlying cause, highlighting the complexity of the investigation and the potential for undiscovered defects or maintenance issues within the aircraft's hydraulic architecture.
To identify the root cause, Airbus has prescribed an extensive diagnostic regimen for Air India. The airline must conduct comprehensive testing of the aircraft's hydraulic systems, along with detailed examination of the pressure sensors and switches responsible for monitoring system status. Several sensors are to be removed and shipped for independent laboratory inspection. Airbus also flagged the possibility that wiring associated with the hydraulic systems may require further scrutiny, suggesting concerns about potential electrical faults that could have triggered the cascade of failures. Additionally, the aircraft experienced structural forces exceeding design specifications during the abrupt altitude change, necessitating a thorough inspection for hidden damage to the fuselage and internal structures.
The investigation by Indian authorities, led by the Aircraft Accident Investigation Bureau with technical support from Airbus and France's BEA, has officially classified the incident as serious. This designation reflects the severity of the control loss and the potential for tragedy had pilots been unable to recover control authority. The investigation is examining maintenance records for the aircraft over the preceding month and seeking detailed accounts from both the captain and first officer about conditions leading up to the incident and their actions during the emergency.
Complications within the Air India organisation have added a layer of complexity to the incident's aftermath. The flight's captain tested positive for marijuana in a confirmatory drug test, according to sources familiar with the matter. While no causal link has been established between the test result and the hydraulic failure, the revelation has triggered organisational responses within Air India. The carrier initiated mandatory substance testing for all pilots beginning August 13, signalling heightened internal scrutiny and a determination to address any safety culture issues.
Air India's initial public characterisation of the event as turbulence-related proved misleading and was subsequently abandoned. The airline later revised its description to simply state that the aircraft had experienced a sudden loss of altitude, a characterisation that, while factually accurate, obscures the technical severity of the hydraulic failures. This inconsistency in public messaging has raised questions about the airline's transparency and communication protocols during safety crises.
The incident arrives at a particularly challenging moment for Air India, which faces mounting pressures on multiple fronts. The Tata Group-controlled airline is undergoing a leadership transition as Tewolde Gebremariam, the former chief executive of Ethiopian Airlines, prepares to assume command. Air India remains burdened by substantial accumulated losses and has come under intensified regulatory and safety scrutiny following the June 2025 crash of one of its Boeing 787 aircraft in Ahmedabad, India, which resulted in 260 fatalities. That catastrophic event fundamentally altered the airline's safety standing and public perception, making any subsequent incident a matter of acute concern.
For the broader aviation sector in South and Southeast Asia, the August A320 incident underscores the critical importance of hydraulic system redundancy and the potential consequences of shared-component failures in supposedly independent systems. The incident also highlights the vulnerability of even modern aircraft to scenarios where multiple safeguards fail simultaneously, a concern that resonates across airlines operating in the region. Singapore Airlines, which holds a significant 25 per cent stake in Air India, is also watching the investigations and remedial actions closely, given its own reputation for safety excellence and its commercial interest in Air India's recovery.
The resolution of this investigation will depend on Airbus and Air India's ability to identify whether the failure stemmed from design, manufacturing, maintenance, or operational factors. Each possibility carries different implications for the global A320 fleet, of which thousands operate worldwide, including extensively throughout Southeast Asia. Maintenance practices, sensor reliability, and wiring integrity across other aircraft may require examination if systemic issues emerge. For Air India specifically, the resolution will determine whether the August 4 incident represents an isolated anomaly or a symptom of deeper challenges within the airline's maintenance and operational culture, a distinction that will significantly influence the carrier's path forward under Tewolde Gebremariam's leadership.
