International media have published the preliminary investigation report of the air incident in Ahmedabad, when the plane crashed, killing 241 passengers and only one person survived.
According to what the Indian Air Accidents Investigation Bureau has revealed, just a few seconds after takeoff, the fuel supply to both engines of the Air India plane was cut off.
Both switches controlling the fuel supply had been switched to the “cut-off” position, which causes the engines to shut down immediately. But what adds to the mystery are the audios heard from the black boxes.
In the cockpit voice recording, one of them is heard asking the other: "Why did you stop it?", referring to the fuel.
The other pilot replies that he didn't do it.
A few seconds later, the plane began to lose altitude and an emergency signal was sent from the cockpit before the plane crashed into the ground, outside the airport perimeter.
The report states that the fuel switches were turned one after the other to the “cut-off” position. They were immediately turned back to the “on” position, allowing one of the engines to restart, but at that point, the plane was unable to regain speed to avoid a crash.
The report does not specify which of the pilots made the statements heard in the cockpit, nor which of them transmitted the "mayday" call before the crash.
The pilot in command was Sumeet Sabharwal, 56, with over 15,600 hours of flight time, while co-pilot Clive Kunder, 32, had 3,403 hours of experience.
The report does not explain how the switches could have inadvertently been switched to the "cut-off" position.
According to experts, they include safety mechanisms that make accidental movement impossible.
Under normal conditions, they are only used after the plane has arrived at the gate, or in rare emergencies, such as an engine fire – but the report does not mention any such emergency.
This has added even more dilemmas.
US aviation security expert John Cox told Reuters that the keys could not have been moved accidentally.
“You can't accidentally touch them and have them change position,” he said.
Another expert, Anthony Brickhouse, asked the question: "If the keys were moved by a pilot, why was this done?"
The sole survivor of the incident was Vishwash Kumar Ramesh, a 40-year-old British national. He said the plane "seemed to stall in mid-air immediately after takeoff."
The plane crashed into a residential area, killing several people on the ground.
As for the final report on the event, it could take several months.