New evidence suggests the crash of Air India Flight 171 could have been the result of human error or that the fuel cut-off switches were deliberately triggered by one of the pilots.
The AI171 flight from Ahmedabad, in western India, to London crashed less than a minute after take-off, killing all but one of the 242 passengers and crew on board as well as 19 people on the ground, making it the world's worst aviation disaster in a decade.
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What did the commentators say?
The findings reveal the "fundamental reason why the jet crashed, but much remains unexplained", said CNN.
The report does "not make clear how the fuel switches were flipped to the cut-off position during the flight, whether it was deliberate, accidental or if a technical fault was responsible".
Aviation experts have been quick to point out that on Boeing 787 Dreamliners the fuel switches must be pulled up to unlock before flipping and are also safeguarded by protective brackets to prevent them being activated accidentally.
A safety feature "dating back to the 1950s," these level-lock switches are "built to exacting standards" and are "highly reliable", said the BBC.
A key piece of evidence comes from the cockpit voice recording, in which one of the pilots is heard asking: "Why did you cut off?" in reference to the fuel supply switch. The other pilot responds: "I did not do so".
This has understandably focused attention on the two pilots.
The captain, 56-year-old Sumeet Sabharwal, was "nearing the end of an impeccable career as a commercial pilot" with more than 15,000 hours of flying experience, said The Times. His co-pilot, 32-year-old Clive Kunder, was "much nearer the start of his career". Both men were "well-rested".
In the aftermath of the crash, both pilots were "treated as heroes" as they managed to steer the descending plane away from a crowded block of residential flats. But the AAIB report "raises questions about the pilots' actions that afternoon", while simultaneously "finding no fault so far with the aircraft itself".
"Deliberate, malicious intent from either pilot would appear unthinkable given the record of the Air India officers in the cockpit", said The Guardian. "Switching off by mistake would also seem incredible. And yet human error cannot be excluded".
What next?
Analysis of the full cockpit voice recorder "holds the key to this puzzle", said the BBC. With "audio from pilot mics, radio calls and ambient cockpit sounds" as well as a "full cockpit transcript", it should be possible to ascertain who said what and which pilot was in control of the aircraft at the time the fuel switches were turned off.
The Air India crash has also made a case for "revisiting" cockpit video recorders, said The Air Current. More than 20 years – and multiple airline crashes – after the US National Transportation Safety Board recommended fitting crash-protected cockpit image recording, "video recording technology is ubiquitous, advanced and nowhere to be found in the cockpits of most commercial jetliners".
The AAIB report also highlighted a 2018 bulletin from the US Federal Aviation Administration about the potential for the fuel control switch locking mechanism to disengage. While "not mandatory, the inspection recommended by the FAA was not performed by Air India", said The Times, prompting legal action from victims' families to obtain information on the Boeing 787's fuel control system.
A full report into the crash is expected in 12 months.
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