What went wrong on the doomed Air India flight to Gatwick?

As investigators begin examining three key pieces of equipment, MailOnline's Elena Salvoni looks at all the clues that could reveal what went wrong on the doomed Air India flight to Gatwick.Sole survivor Vishwash Kumar Ramesh from Leicester has described feeling like the Boeing 787 Dreamliner was 'stuck in the air' and was 'gliding' rather than climbing after take off.