A dramatic technical failure aboard an Air India Airbus A320 in early August left the aircraft briefly uncontrollable, according to preliminary findings from plane maker Airbus that have shed light on one of India's most serious aviation incidents in recent months. The aircraft, operating as flight AI2379 from Phuket to Delhi on August 4, plummeted approximately 90 metres following a simultaneous loss of pressurised fluid across all three hydraulic systems, the critical infrastructure that powers essential flight controls. Despite the frightening sequence of events and injuries sustained by 24 people onboard, the pilots managed to land the aircraft safely in Delhi, preventing what could have been a catastrophic outcome.
The Airbus analysis, which was reviewed by international wire services, paints a picture of a remarkably narrow window of danger. For roughly four seconds, the flight crew found themselves essentially flying a machine that would not respond to their commands. The elevators and ailerons—the movable surfaces on the tail and wings that determine whether an aircraft pitches nose-up or nose-down and whether it banks to either side—became completely unresponsive. During this critical period, the aircraft pitched upward sharply as it lost altitude, a combination that could easily have spiralled into an uncontrollable situation. The first officer immediately made a full nose-down input in an attempt to regain control, but the flight control surfaces refused to budge, leaving the crew helpless until hydraulic pressure gradually returned to normal within seconds.
The sequence of events represents the kind of cascading system failure that aviation experts consider among the most dangerous possibilities in modern flight. Airbus designed commercial aircraft with triple-redundant hydraulic systems specifically to guard against this scenario—the idea being that if one system fails, two others remain operational. Yet in this instance, all three systems lost pressure in rapid succession, a phenomenon that airworthiness officials have now classified as a serious incident. India's Aircraft Accident Investigation Bureau has taken charge of the investigation with technical support from Airbus and France's Bureau d'Enquête et d'Analyse, indicating the gravity with which authorities are treating the matter.
What remains unclear is the root cause of the hydraulic failure. Airbus has not yet determined what triggered the simultaneous loss of pressure across all three independent systems, though the initial assessment has ruled out many possibilities and identified several promising avenues for further investigation. The manufacturer has requested that Air India conduct comprehensive testing of the aircraft's hydraulic systems and the pressure sensors and switches responsible for monitoring them. Additionally, Airbus wants certain sensors physically removed and inspected in detail, and has indicated that closer examination of wiring throughout the hydraulic system may become necessary. The plane maker is also concerned about structural integrity, having detected that the aircraft experienced forces beyond its specified limits during the sudden altitude change, necessitating inspections for potential damage.
Air India faces mounting pressure to provide answers and reassurance to passengers and regulators alike. The airline initially characterised the incident as weather-related turbulence, a description it later abandoned in favour of acknowledging it was a sudden and unexplained loss of altitude. This shift in narrative, while technically more accurate, underscores the airline's initial uncertainty about what actually occurred. Airbus has now asked Air India to supply detailed records of all hydraulic system maintenance performed in the month preceding the incident, as well as more comprehensive accounts from both the captain and first officer about their experience during the malfunction.
Complicating matters further, the captain of the aircraft tested positive for marijuana in a confirmatory drug screening that occurred after the incident. While investigators have established no connection between this result and the technical failure, the disclosure has intensified scrutiny of the airline's safety culture. Air India responded by implementing mandatory substance testing for all pilots beginning August 13, according to an internal memorandum, signalling the organisation's determination to address safety concerns head-on.
The timing of this incident could hardly be worse for Air India, which is navigating a period of significant organisational transition and unprecedented operational challenges. Tewolde Gebremariam, the former chief executive of Ethiopian Airlines, is preparing to assume the top position at the Tata Group-controlled carrier, inheriting an organisation burdened by substantial financial losses and mounting regulatory scrutiny. The airline's credibility has been further damaged by the June 2025 crash of one of its Boeing 787 Dreamliners in Ahmedabad, a catastrophe that claimed 260 lives and triggered intense investigation into the carrier's maintenance and operational practices.
For the broader Southeast Asian aviation sector and particularly for Malaysian carriers and passengers who frequently fly Air India routes, the incident underscores the critical importance of rigorous oversight of airline safety practices. The proximity of Phuket as an origin point makes this incident particularly relevant to the region, as many travellers connect through Thai hubs to Indian destinations. Singapore Airlines' substantial 25 per cent stake in Air India means the incident also carries implications for one of the region's most respected carriers, which has been working to rehabilitate Air India's operational standards and safety record through its partnership.
The incident raises broader questions about the adequacy of preventive maintenance protocols and the robustness of monitoring systems designed to catch emerging problems before they become dangerous. Airbus has built redundancy into every major system precisely because engineers recognise that single-point failures can prove catastrophic. The fact that all three hydraulic systems lost pressure simultaneously suggests either a common underlying cause affecting multiple systems, or a failure in the systems designed to protect against such scenarios. These possibilities will occupy investigators for months to come.
Regulators across Asia are watching the Air India investigation with particular interest, as it will likely generate recommendations about maintenance standards, sensor reliability, and pilot training protocols. For airlines operating Airbus A320s throughout the region—which includes virtually every major carrier in Southeast Asia—the findings could trigger widespread inspections and potential modifications to hydraulic system components or monitoring protocols. The incident serves as a reminder that even mature, widely-used aircraft types can present unexpected technical challenges, and that constant vigilance remains essential.
As the investigation progresses, Air India must demonstrate both transparency and decisive action to restore confidence among passengers, investors, and regulatory authorities. The successful landing of flight AI2379 despite catastrophic systems failures represents exceptional piloting, but it should not obscure the underlying technical problems that allowed such a dangerous situation to develop. The findings that emerge from the Aircraft Accident Investigation Bureau's examination will likely reshape safety practices across the Indian aviation sector and potentially influence operations throughout South and Southeast Asia.
