
A preliminary report into the Air India crash that killed 260 people last month showed three seconds after taking off, the plane’s engines fuel cutoff switches almost simultaneously flipped from run to cutoff, starving the engines of fuel.
The Boeing 787 Dreamliner immediately began to lose thrust and sink down, according to the report released by Indian aviation accident investigators.
One pilot can be heard on the cockpit voice recorder asking the other why he cut off the fuel. “The other pilot responded that he did not do so,” the report said.
It did not identify which remarks were made by the flight’s captain and which by the first officer, nor which pilot transmitted “Mayday, Mayday, Mayday” just before the crash.
At the crash site, both fuel switches were found in the run position and the report said there had been indications of both engines relighting before the low-altitude crash.
Both pilots were experienced jet pilots with about 19,000 total flying hours between them, including more than 9,000 on the 787.
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The preliminary report also does not say how the switch could have flipped to the cutoff position on the June 12 London-bound flight from the Indian city of Ahmedabad.
The crash killed 241 of 242 people on board, with 260 people killed in total as the aircraft plunged into a medical college. The sole survivor on board the plane was British national Vishwashkumar Ramesh. There were 169 Indian nationals, 53 British citizens, seven Portuguese nationals, one Canadian and 12 crew on board.
US aviation safety expert Anthony Brickhouse said a key question is why were the switches moved in a way that is inconsistent with normal operations.
“Did they move on their own or did they move because of the pilots?” he said. “And if they were moved because of a pilot, why?”
US aviation safety expert John Cox said a pilot would not be able to accidentally move the fuel switches that feed the engines. “You can’t bump them and they move,” he said.
Flipping to cutoff almost immediately cuts the engines. It is most often used to turn engines off once a plane has arrived at its airport gate and in certain emergency situations, such as an engine fire. The report does not indicate there was any emergency requiring an engine cutoff.
“At this stage of investigation, there are no recommended actions to Boeing 787-8 and/or GE GEnx-1B engine operators and manufacturers” India’s Aircraft Accident Investigation Bureau said.