Air India crash: As theories swirl, key details remain unknown

Experts have raised questions about information not included in the preliminary report, writes Theo Leggett.

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While the preliminary report into what caused the loss of Air India Flight 171 last month has provided some answers, it has also prompted a wave of speculation about its cause.

The Boeing 787 Dreamliner crashed into a building less than a minute after take-off from the city of Ahmedabad in western India en route to London, killing 241 people on board, along with 19 on the ground. One passenger survived.

Information contained in India's Air Accident Investigation Bureau report, the first official account of what happened, has raised questions about the role of the pilots.

However, experts within the aviation industry claim investigators have been highly selective in what they have chosen to say.