While the report from investigators could be made public on Friday, the three sources cautioned Reuters that plans could change and there was no clarity on how much information would be available in the document,

Aviation industry publication the Air Current first reported the focus on the fuel switches that help power the plane's two engines.

The investigation into the Air India flight 171 crash is focusing on the movement of the engine fuel control switches, following an analysis of the Boeing 787's flight and voice data recorders