Boeing Dreamliner investigators call for all airlines to check emergency beacons The FAA said: "Safety is our top priority. The Federal Aviation Administration has been an active participant in the investigation into the incident involving a Boeing 787 while parked on the ground in London. We are currently reviewing the AAIB's report and recommendations to determine the appropriate action. We will work closely with the AAIB, as well as Boeing and Honeywell, as the investigation into the cause [of the fire] continues. Honeywell said it backed the move to switch off the part, but stresses that it was " premature to jump to conclusions." Meanwhile, Boeing shares fell 2pc in after-hours trading on Thursday after a Japan Airlines Dreamliner flying from the US to Tokyo was forced back to Boston for "maintenance."