An official report on the world’s deadliest aviation accident in a decade, seen by CNN, has answered one key question – but raised others.

India’s initial findings into the crash of an Air India aircraft last month raise more questions, according to the airline’s Chief Executive Officer, who defended the fitness of the cockpit crew and the company’s track record of inspecting its fleet.

Air India CEO Campbell Wilson reportedly said in an internal memo that the investigation into the crash of flight AI 171, which involved the Boeing Co.’s (BA) 787-8 Dreamliner jet, is “far from over.” According to a Reuters report,