Stig Shift #78 (Aircraft Maintenance Adventures)

... mainly Boeing 787s. At 14:55 he explains the whole fuel switch system in great detail. It does not involve any software control at all: it's a direct electrical connection to a relay which controls power to an electro-mechanical valve that controls the fuel supply to the engines, so it's completely independent from the FADEC system in the engine. I also saw another description on the Mover and Gonky show, see below, of the actual microswitch which is multi-pole, so a separate connection goes to the flight data recorder. It does seem like sabotage would be very difficult to do like this. See Juan Browne, Stig Aviation and Taking Off on the Air India 787 Crash and also Juan Browne on the Air India 787 Preliminary Accident Report and Captain Dan Gryder with a Theory About Air India Flight 171.


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The Mover and Gonky Show on the Flight 171 Crash:


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