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.

Air India CEO Campbell Wilson confirmed that no mechanical or maintenance faults were found in the AI171 crash. The airline has checked its entire Boeing 787 fleet and promised full cooperation in the ongoing investigation.

CEO Campbell Wilson said in an internal memo that the airline is open to further inquiries and warned against "premature conclusions."