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.

Boeing Co. (NYSE: BA) faced a sharp 5% drop in its stock price yesterday following the tragic crash of an Air India Boeing 787-8 Dreamliner in Ahmedabad, India.