The investigation report says Air India did not carry out those inspections - prompting speculation that the accident could have been caused by faulty switches being flipped by accident. However, in an internal note seen by the BBC, the FAA has since reiterated its belief that the issue did not compromise safety.

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 said on Tuesday it would partially restore its international flight schedule that was scaled back following the accident involving flight AI171 on June 12.