Comment by nottorp
1 day ago
The way i read what avherald highlighted is that a part that the manufacturer said should be replaced wasn't and failed as the manufacturer said it will. So it would point to the airline maintenance right now.
What the bbc says is truncated and omits the info about the failing part, so people can point towards murder suicide because they don't have all the info.
Which is why you should always read avherald first...
The avherald is reporting second hand reports of the Indian media. The EEC MN4 microcontroller is located on a control board on each engine. A dual failure seems improbable.
The fuel cutoff switches are of a similar design to the 737 and most other Boeing aircraft. A failure in that design seems less likely than the most charitable explanation, that the copilot inadvertently went into the wrong mode of muscle memory.
The interim report does mention the SIAB NM-18-33. If you read that document it specifically says that the fuel cut-offs were installed with the locking feature deactivated on some 737 aircraft. It's a pretty big leap to that causing this incident. Someone or some thing would still need to have touched the switches to move them.