The CEO of Air India sought to draw a line under rife speculation around the cause of last month's air disaster in Ahmedebad, saying the preliminary investigation had ruled out a mechanical cause for the crash.

The investigation of the crashed Air India Dreamliner in Ahmedabad city last month is "far from over", the airline's Chief Executive Campbell Wilson said in an internal memo on Monday, adding that the airline remains open to further inquiries and cautioned against "premature conclusions".

According to AAIB's report, Clive Kunder, a pilot with roughly 1,100 flight hours on Boeing's most advanced jet, was flying the plane.