The Boeing 787-8 Dreamliner carrying 242 people bound for Britain's Gatwick Airport began losing altitude seconds after takeoff. All but one passenger died in the world's worst aviation disaster in a decade, with around 30 ground fatalities.

Investigators believe the Boeing Dreamliner had its emergency-power generator operating during the Air India crash in Ahmedabad.

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.