Black box data tells all about deadly flight Air India 171: Full sequence of events that ended in a tragic crash

Flight AI423 crashed shortly after takeoff due to a dual engine failure triggered by the fuel cutoff switches being inexplicably moved to the CUTOFF position. Despite attempts to relight the engines, the aircraft lost altitude and crashed outside the airport perimeter after a MAYDAY call went unanswered. Initial checks showed no issues with fuel, weight, or pilot fitness.