Air India Phuket-Delhi flight: Warnings indicated low reservoir levels in the Yellow and Blue systems, autopilot disconnect and elevator flight-control fault.
The August 4 incident, which left 20 passengers and four crew members injured on flight AI2379, an Airbus A320 registered as VT-EXO, was classified as serious and led to an investigation by the Aircraft Accident Investigation Bureau (AAIB).
The pilot’s initial post-flight drug screening was recorded as “non-negative”, meaning the sample had been flagged for further testing. His confirmatory test later returned positive for cannabis.
Multiple warning signs during aircraft plunge
An engine anti-ice fault appeared at 10.16am, followed by another autopilot disconnect at 10.52am. Unlike the first disconnect, the second was not recorded alongside any hydraulic warnings. The log does not provide a reason for the disconnect.
The pressure readings changed across different system combinations within the same minute, rather than showing a single system failing and remaining in that state. This could indicate a temporary event, such as a sharp vertical movement or sudden loss of altitude. Such an event can briefly move fluid inside the hydraulic reservoirs, based on a reading of the log by HT against standard A320 fault-code references.
A sustained mechanical fault would likely have generated additional warnings, including messages indicating that the issue had recurred.
Flightradar24 data places the altitude change within the same minute as the cluster of warnings. The aircraft was flying at 36,160 feet when an altitude anomaly was recorded at 9.33am IST. It then descended to around 35,800 feet, representing a loss of about 360 feet, according to Flightradar data.
Pilot slept 30-35 minutes during flight
The pilot told investigators that he slept for 30 to 35 minutes during the flight, went to the washroom and then returned to stand behind the first officer, according to two people familiar with his account to the AAIB.
They said he was talking about the air conditioning system when the altitude event occurred and that he was thrown to the cockpit floor. The first officer was operating the aircraft, while the commander was acting as the pilot monitoring, the two people said.
The complete sequence of events inside the cockpit could not be independently confirmed by the pilots' accounts to investigators.
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