Investigators in India are studying the black boxes of a Boeing 787 Dreamliner after recovering them from the aircraft wreckage to ascertain the cause of last week’s plane crash that left at least 270 people dead.

Air India has cancelled 83 flights since the Ahmedabad crash of AI171, with 66 involving Boeing 787 Dreamliners. The DGCA has mandated intensified safety checks on the fleet. While 24 aircraft have cleared inspections,

The black boxes will provide cockpit conversations and data related to the plane’s engine and control settings to investigators and help them in determining the cause of the crash.