Last year, the F.A.A. said it was also investigating claims by a Boeing engineer that parts of the fuselage, or body, of the Dreamliner were improperly fastened together, which the whistle-blower said could cause premature damage to the plane over years of use.

An Air India Boeing 787-8 Dreamliner crashed shortly after takeoff from Ahmedabad, marking the first fatal accident involving this flagship long-haul aircraft. The doomed flight had 242 people onboard,