An Air India Airbus A320 experienced a terrifying loss of flight control systems in early August, with a preliminary Airbus assessment revealing that pilots were left unable to operate critical control surfaces for approximately four seconds during the incident that caused the aircraft to drop 90 metres and injure 24 people on board. The August 4 occurrence unfolded aboard Air India flight AI2379 operating between Phuket and Delhi, ultimately landing safely despite the momentary loss of altitude and control authority.
According to Airbus' initial technical review—accessed by Reuters—the aircraft suffered sequential failures across all three independent hydraulic systems in rapid succession. These hydraulic networks operate under high pressure to transmit pilot inputs to movable flight surfaces and other critical equipment throughout the aircraft. The simultaneous collapse of this redundancy represents an unusual and serious technical event that left pilots with severely limited ability to manoeuvre the aircraft. The A320 design includes three separate hydraulic circuits specifically to ensure that loss of one system does not compromise flight safety, making a total loss of all three an exceptionally rare occurrence.
During the four-second window when hydraulic pressure was absent, the aircraft's elevators and ailerons became unresponsive. These surfaces are essential for controlling pitch—the nose-up or nose-down attitude of the aircraft—and roll, the banking motion that allows directional changes. The first officer immediately attempted to regain control by applying maximum nose-down input, but the flight control surfaces provided no immediate response. The aircraft consequently pitched upward uncontrollably during this critical period before all three hydraulic systems spontaneously recovered within seconds, restoring normal flight control authority to the flight deck. The abrupt return of control and the sudden altitude change subjected the airframe to forces exceeding the aircraft's design limits, prompting Airbus to request comprehensive structural inspections.
Remaining uncertain is the root cause of the hydraulic system failures. Airbus has tasked Air India with conducting extensive diagnostic testing on the hydraulic systems themselves, as well as the pressure sensors and switches that monitor system status and alert pilots to anomalies. The manufacturer has requested that specific sensors be physically removed from the aircraft for laboratory analysis and indicated that detailed examination of wiring harnesses and electrical connections may be necessary to identify potential points of failure. The airline must also provide complete maintenance records for the hydraulic systems covering the month preceding the incident, a timeline that could reveal whether recent servicing, repairs, or component installations contributed to the cascade of failures.
Airbus is also seeking detailed written accounts from both pilots regarding their experience during the incident, including their perception of what occurred, the instruments and warnings they observed, and their response to the emergency. Such pilot narratives often provide valuable context that complements technical data and can point investigators toward specific system behaviours or environmental factors that may have triggered the sequence of events. The investigation represents a complex technical challenge given the simultaneous failure mode, which suggests either a common cause affecting all systems or an extraordinary coincidence of individual failures.
Indian aviation authorities have formally classified the occurrence as a serious incident, triggering an investigation by the Aircraft Accident Investigation Bureau with technical assistance from both Airbus and France's Bureau of Enquiry and Analysis for Civil Aviation Safety. The involvement of international partners underscores the significance of the event and the need for technical expertise in unravelling what occurred. The investigation will examine all potential contributing factors including maintenance practices, component manufacturing, pilot response, and any environmental or operational circumstances that may have set the stage for the hydraulic system failures.
Air India initially attributed the incident to atmospheric turbulence, but subsequently revised its public statements to characterise it as a sudden loss of altitude without reference to weather phenomena. This shift in terminology suggests that the airline and investigators determined that conventional turbulence did not adequately explain the severity of the occurrence or the flight control anomalies involved. The change also reflects the airline's recognition that the event involved more serious technical considerations than weather-related disturbances.
Complicating the situation is the discovery that the flight's captain tested positive for marijuana in a confirmatory drug screening conducted after the incident. Air India subsequently initiated mandatory substance testing for all pilots beginning August 13, implementing the policy through an internal memorandum. However, investigators have not established any connection between the captain's test result and the hydraulic system failures or altitude loss, and no evidence currently suggests that substance use contributed to or exacerbated the technical emergency that occurred.
The incident arrives during a particularly challenging period for Air India, which faces intense scrutiny following the June 2025 crash of a Boeing 787 in Ahmedabad that killed 260 people. The airline is simultaneously managing a leadership transition as Tewolde Gebremariam, the former chief executive of Ethiopian Airlines, prepares to assume the chief executive position. Air India, controlled by the Tata Group and partially owned by Singapore Airlines with approximately 25 per cent equity, has been struggling with mounting financial losses and increasing regulatory oversight.
For Malaysian and Southeast Asian aviation professionals, the incident highlights the ongoing importance of hydraulic system integrity in commercial aircraft operations and the critical role of redundancy in ensuring safety when individual systems fail. The A320, one of the world's most widely operated commercial aircraft with significant presence in Malaysian and regional airline fleets, maintains an exceptional safety record, and this incident remains extraordinarily unusual. The investigation's findings will likely inform maintenance procedures and inspection protocols across airlines throughout the region and globally, ensuring that similar situations can be prevented or better managed in future operations.
