As the world waits for answers on the fatal Air India Boeing 787 crash, accident investigators have narrowed their focus on the engine fuel control switches.

AAIB officials have also informed a parliamentary committee that it is retrieving parts of the plane’s wreckage to be sent to the original equipment manufacturers (OEM) so they can be checked for poss

A preliminary report into the deadly crash of an Air India jetliner in June is expected to be released by Friday, three sources with knowledge of the matter said, with one adding the probe had narrowed its focus to the movement of the plane's fuel control switches.