An Air India Airbus A320 lost control of critical flight surfaces for approximately four seconds in August when the aircraft experienced a sudden loss of pressurised hydraulic fluid across all three independent systems, according to preliminary findings by Airbus reviewed by Reuters. The incident occurred on flight AI2379 travelling from Phuket to Delhi on August 4, during which the aircraft descended roughly 90 metres in altitude and injured 24 passengers and crew members on board. Despite the temporary loss of control authority, the aircraft landed safely at its destination in Delhi, though the occurrence has triggered investigations by Indian aviation authorities and prompted questions about the carrier's safety protocols.
During those critical four seconds when hydraulic pressure evaporated across all systems, the pilots found themselves unable to manipulate the elevators and ailerons—the movable surfaces on the tail and wings responsible for controlling pitch and roll, fundamental to keeping any aircraft stable and directed. The first officer immediately attempted to regain control by pushing the control stick fully forward in a nose-down command, but the flight control surfaces remained unresponsive to his input. Airbus's analysis indicates that during this interval the aircraft pitched upward, a consequence of losing the ability to apply downward control inputs, before the three hydraulic systems recovered power within seconds of the initial failure.
Airbus has not yet determined the root cause of why all three independent hydraulic circuits failed simultaneously—an extraordinarily rare occurrence given that modern commercial aircraft are designed with multiple redundant systems specifically to prevent such scenarios. The aircraft manufacturer has consequently requested that Air India conduct extensive testing of the hydraulic systems themselves, as well as the pressure monitoring sensors and switches that detect anomalies. Airbus has also asked the airline to remove certain sensors for detailed laboratory inspection and indicated that comprehensive wiring checks may be necessary to identify any electrical faults or contamination that could have triggered the cascade failure.
Beyond investigating the hydraulic systems, Airbus determined that the sudden altitude change subjected the aircraft structure to forces exceeding design specifications. This discovery prompted the manufacturer to direct Air India to conduct a thorough structural inspection to identify any damage caused by the abrupt manoeuvre. The plane maker additionally requested detailed maintenance records covering the month preceding the incident and obtained more comprehensive pilot accounts describing the sequence of events and their actions during the emergency.
The airline's initial public explanation of the incident described it as a turbulence-related event, a characterisation that proved insufficient once technical analysis began. Air India subsequently revised its statement to acknowledge that the aircraft had experienced a sudden loss of altitude, a more accurate description but one that obscured the more fundamental issue of complete loss of hydraulic pressure. Indian aviation authorities classified the occurrence as a serious incident, triggering investigation by the Aircraft Accident Investigation Bureau with technical assistance from Airbus and France's Bureau of Enquiry and Analysis for Civil Aviation Safety.
The incident has acquired additional complexity following revelations that the flight's captain tested positive for marijuana during a confirmatory drug test conducted after the event. However, no evidence has emerged linking this result to the hydraulic failure or the loss of altitude. The finding nevertheless prompted Air India to institute mandatory substance testing for all pilots beginning August 13, measures that extend the regulatory scrutiny the airline now faces beyond technical and mechanical issues.
For Air India, the August 4 incident represents a fresh challenge as the carrier navigates a period of significant organisational transition and operational difficulty. Former Ethiopian Airlines chief Tewolde Gebremariam is preparing to assume the position of chief executive at the Tata Group-controlled airline, which has been struggling with mounting financial losses and intensified safety oversight. The carrier is attempting to stabilise its operations while contending with the aftermath of a June 2025 Boeing 787 crash near Ahmedabad that killed all 260 people on board, an event that devastated the airline's reputation and attracted sustained scrutiny from regulators and the travelling public.
The timing of the A320 incident underscores the operational pressures confronting India's largest international carrier. Multiple simultaneous challenges—financial deterioration, recovery from a catastrophic accident, and now evidence of recurring technical issues—paint a picture of an airline in transition facing substantial headwinds. Singapore Airlines, which holds approximately a 25 per cent stake in Air India through its ownership structure, has a vested interest in the carrier's stabilisation and safety record, particularly given the reputational risks associated with aircraft incidents within their portfolio of investments.
The investigation into the August 4 incident will likely consume considerable technical resources from both Airbus and Air India over the coming months. Engineers must determine whether the simultaneous failure of all three hydraulic systems resulted from a manufacturing defect, maintenance error, design vulnerability, contaminated hydraulic fluid, electrical system malfunction, or some combination of factors. For Malaysian and Southeast Asian aviation stakeholders, the case serves as a reminder of the critical importance of redundant safety systems in commercial aviation, and how even robust design can encounter unexpected failure modes that require systematic investigation to prevent recurrence.
