Dear fellow countrymen, I hate to break it to you but this is India's version of German Wings. There is absolutely no way in a billion odds that these fuel cut off switches can be operated due to software or hardware issue without manual-human input, they are fail safe mechanical switches which are connected directly to FADEC.
It is part of the closed loop/isolated system architecture that the Boeing 787 uses, It is clear to me one of the pilots deliberately pulled the switches and the other tried to reverse the horrific actions, the switch toggle sound and aircraft alarms consequent to the actions along with the ensuing fight/tussle between the pilots to re-initiate the cut off switches to on position would have been recorded in the Cockpit Voice Recorder (CVR), transcripts of which are yet to be released.
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The FAA directive for Honeywell manufactured 4TL837‑3D switches only says “few aircrafts did not have the locking feature functional” which would have obviously been reported long ago by the pilots of VT-ANB or another 787 back in 2018 itself when the directive was put out, which clearly did not occur till date. Even if the locking mechanism failed, the power needed to pull and engage this switches due to the spring action system holding the switches would be immense, way more than Takeoff/Rotate cabin vibration can accidentally induce.
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Post crash analysis of the switches will also reveal if there is indeed a mechanical issue with the spring seat or push/pull mechanism required to operate the switches, data of which would exist already with AAIB.
The FDR data and no technical directive to Boeing/GE strongly suggests and confirms the above scenario. Remember the weakest link always, is mostly human not machines.
AAIB also clearly knows exactly which pilot would have engaged the cut off switches as well but pending investigation has decided not to release the CVR transcripts for confirmation. Definitely not the kind of fate 259 lost souls would have ever imagined even in their worst nightmares. Om Shanti to the departed souls.