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.

The AAIB submitted its preliminary report on the Air India AI-171 crash in Ahmedabad to the civil aviation ministry. A Parliament committee will discu

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,