The preliminary finding gives investigators a new line of inquiry as they study a crash that killed all but one of the plane’s passengers.

The London-bound Boeing 787-8 Dreamliner with 242 people on board crashed into a medical hostel complex in Ahmedabad on June 12.

Tragedy struck India last week when an Air India Boeing 787 crashed less than a minute after takeoff in Ahmedabad. Air India flight AI171 was bound for London Gatwick and was carrying 230 passengers along with 12 crew members.