An Airbus A320 operated by Air India experienced a critical but temporary loss of all three hydraulic systems during a flight from Phuket to Delhi on August 4, according to preliminary technical analysis by the aircraft manufacturer. The incident resulted in the aircraft descending approximately 90 metres and left 24 people aboard injured, though the flight ultimately landed safely in Delhi without further incident. The discovery adds another layer of concern to India's national carrier as it navigates a turbulent period marked by intensified regulatory oversight and operational challenges.
The sequence of events unfolded with alarming speed. Airbus' technical assessment, reviewed by Reuters, confirms that all three independent hydraulic systems—which employ pressurised fluid to operate essential flight control surfaces and ancillary equipment—failed in rapid succession. For approximately four seconds, the aircraft's flight control systems became entirely unresponsive. During this critical window, the pilots found themselves unable to manipulate the elevators and ailerons, the movable surfaces on the wings and tail responsible for pitching the aircraft up or down and banking it left or right. As the aircraft pitched upward unexpectedly, the first officer applied maximum nose-down control input, yet the flight surfaces remained inert, providing no directional feedback until the hydraulic systems spontaneously recovered seconds later.
The cause of the simultaneous hydraulic pressure loss remains undetermined at this stage of the investigation. Airbus has directed Air India to undertake comprehensive testing of the aircraft's entire hydraulic architecture, including detailed examination of the pressure sensors and electronic switches that continuously monitor system integrity. The manufacturer has requested that certain sensors be extracted and sent for detailed laboratory analysis, while flagging that comprehensive wiring inspections may prove necessary as the technical team pursues leads. This methodical approach reflects the complexity inherent in troubleshooting redundant aircraft systems that are deliberately engineered to prevent single-point failures.
Beyond the hydraulic systems themselves, investigators are concerned about structural integrity. The sudden and violent altitude change subjected the airframe to forces exceeding the design specifications that Airbus engineers had established for normal operations. Consequently, Air India has been instructed to conduct a thorough structural inspection to identify any damage caused by the abrupt manoeuvre. Additionally, Airbus has requested comprehensive documentation of all hydraulic system maintenance performed in the month preceding the incident, recognising that improper servicing or overlooked wear could precipitate such failures. The aircraft manufacturer has also called for detailed statements from the flight crew regarding their actions and observations during the event.
Air India's initial public characterisation of the occurrence shifted markedly as more information emerged. The airline's first statement attributed the event to turbulence, a relatively benign explanation that would imply external meteorological factors rather than aircraft malfunction. However, subsequent communications from Air India abandoned this framing, instead accurately describing what had transpired: a sudden and unexplained loss of altitude. This revision suggests that preliminary data analysis contradicted the turbulence hypothesis and pointed toward an internal systems failure—a more serious categorisation that carries different implications for flight safety and operational procedures.
Indian aviation authorities have formally classified the incident as a serious matter requiring full investigation. The Aircraft Accident Investigation Bureau has assumed lead responsibility for the probe, receiving technical collaboration from Airbus and France's BEA, the French accident investigation authority. This multi-jurisdictional approach ensures that expertise from both the aircraft manufacturer and an independent European investigative body informs the process, enhancing the likelihood of identifying root causes and preventing recurrence.
Complicating the narrative is a separate development regarding the flight crew. The captain underwent mandatory drug screening following the incident and tested positive for marijuana in confirmatory analysis, according to sources with knowledge of the situation. Investigators have emphasised that no causal relationship has been established between this positive result and the hydraulic failure. Nevertheless, the finding prompted Air India to implement compulsory substance screening for its entire pilot workforce beginning August 13, a measure signalling the airline's commitment to stringent safety protocols and regulatory compliance during a period of heightened scrutiny.
For Air India, the timing of this incident carries additional weight given the airline's broader operational context. The Tata Group-owned carrier is navigating a critical transition period as Tewolde Gebremariam, formerly chief executive of Ethiopian Airlines, prepares to assume the chief executive role. Air India has been struggling with persistent financial losses while simultaneously undertaking an ambitious operational restructuring. The airline's safety record has come under intense examination following the June 2025 crash of a Boeing 787 in Ahmedabad that claimed 260 lives, an event that triggered enhanced regulatory and public scrutiny of the airline's safety culture and maintenance practices.
The August A320 incident, although resolved without catastrophic consequence, reinforces concerns about whether Air India has adequately addressed systematic issues that may contribute to safety events. The hydraulic system failure, if traceable to maintenance lapses or component degradation, could reflect broader patterns requiring corrective action. Conversely, if the failure stems from manufacturing defects affecting multiple aircraft of the same configuration, the implications could extend beyond Air India to other A320 operators globally, including several Southeast Asian carriers.
Singapore Airlines, which holds a roughly 25 percent stake in Air India, will be monitoring these developments closely given both its financial interest and its own operational safety reputation. For the Southeast Asian aviation community, which has benefited from generally improving safety metrics in recent years, the incident serves as a reminder that modern aircraft systems, despite their redundancy and sophistication, remain capable of unexpected failures that demand rigorous investigation and systemic responses.
The investigation's conclusions, when eventually published, will provide valuable insights into hydraulic system vulnerabilities and the effectiveness of monitoring and maintenance protocols. For Air India specifically, successfully navigating this investigation while implementing credible corrective measures could help restore confidence among passengers, regulators, and the travelling public during a period when the airline's safety reputation requires careful rebuilding.
