Air India A320 Lost 300 Feet, Injuring 24 as Probe Opens
India’s Aircraft Accident Investigation Bureau has opened a serious-incident investigation after an Air India Airbus A320 lost approximately 300 feet during cruise on August 4. The aircraft stabilized and landed safely in Delhi, but India’s Ministry of Civil Aviation now reports injuries to 20 passengers and four cabin crew members.
Flight AI2379, operated by A320 VT-EXO from Phuket to Delhi, was carrying 137 passengers including three infants and eight crew members. The safe landing establishes the outcome, but it does not explain the altitude upset. Reports of an autopilot disconnection, turbulence, hydraulic-system failures, extinguished indicators and a flight-control message remain preliminary accounts rather than investigative findings.
The first task is reconstructing the sequence
Investigators must determine what happened before, during and immediately after the altitude change. That requires more than assembling a list of cockpit indications. Recorded flight data can establish the aircraft’s speed, altitude, attitude and control response over time, while associated system parameters may show when automation disconnected or warnings appeared.
Timing is critical because several indications appearing close together do not necessarily have the same origin. A warning could reflect an initiating fault, a consequence of an aircraft response or a temporary condition encountered during recovery. Without a validated sequence, it would be premature to connect the reported autopilot, flight-control and hydraulic anomalies or turbulence to the 300-foot loss.
The investigation will also examine the aircraft and its systems, along with operational and maintenance records. Physical inspection can test whether reported cockpit indications corresponded to actual system conditions. Maintenance documentation can establish the aircraft’s recent technical history, but the existence of an earlier entry would not by itself prove relevance to this occurrence.
Manual recovery is an outcome, not a causal finding
Preliminary accounts say the co-pilot recovered control manually after the autopilot disconnected. If confirmed, that would be operationally important because it helps define how the aircraft returned to stable flight. It would not establish why the automation disconnected, whether the disconnection initiated the upset or whether it responded to another condition.
The same caution applies to reports of “triple hydraulic failures.” Investigators must first determine exactly what indications appeared, whether pressure or other recorded parameters support that description and how long any abnormal condition lasted. Treating an attributed label as a verified physical failure could distort the analysis before the aircraft data and inspection results are reconciled.
Interviews with the pilots and cabin crew will add context about workload, alerts, aircraft movement and passenger effects. Those recollections are valuable, but investigators normally compare them with recorded and physical evidence rather than treating any single account as definitive. The injuries make cabin conditions part of the inquiry, including the timing and operational consequences of the sudden altitude variation, without establishing what caused it.
International participation brings design-specific evidence
The investigation is proceeding under International Civil Aviation Organization protocols. France’s Bureau of Enquiry and Analysis for Civil Aviation Safety is participating as the authority representing the A320’s state of design and manufacture, while Airbus is supplying technical information, design documentation and specialists.
That assistance does not transfer control of the inquiry from India’s bureau. It gives investigators access to design-specific expertise needed to interpret recorded parameters, system behavior and aircraft documentation. This is a standard part of the international framework for investigating an event involving an aircraft designed and manufactured in another country.
Medical and human-factor material is also being collected. The pilot-in-command underwent confirmatory testing after an initial psychoactive-substance screen produced a result requiring further analysis. That confirmatory result remains pending. ALPA India has noted that common over-the-counter medicines can generate a “non-negative” initial screen, although there is no established indication that medication was involved here. A pending test is not proof of impairment or a causal explanation.
The bureau says it will issue preliminary findings within the timeframe required by the applicable protocols. Until recorded data, aircraft examinations, records, interviews and medical information are evaluated together, the central fact remains bounded but consequential: VT-EXO recovered and landed safely after a roughly 300-foot cruise-altitude upset, while the relationship if any among the reported automation, hydraulic, flight-control and turbulence issues is still undetermined.
By Thomas Caldwell — AMI’s senior editor for mechanical and mobility engineering, covering vehicle electronics, systems integration, electrification, chassis systems, propulsion, and safety policy.
