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.

India's aviation safety watchdog said on Tuesday surveillance conducted on Air India's Boeing 787 fleet did not reveal any major safety concerns, days after one of its jets crashed, killing at least 271 people.

Air India has cancelled eight international Boeing 787-8 Dreamliner flights after the horrific aviation disaster last week. The passenger jets were hit by a mix of issues from aircraft unavailability, technical snags, airspace restrictions, and extended safety checks.