UK air accident investigators have said all emergency locator beacons in Boeing 787 Dreamliners should be disconnected after a blaze on an Ethiopian Airlines jet at Heathrow.
The report by the Air Accidents Investigation Branch, it was caused by a fire in the transmitter- made by US firm Honeywell - located in the upper portion of the rear fuselage.
There are no other aircraft system in this area of the plane which, with the aircraft unpowered, contained stored energy capable of causing such a fire, the agency said.
Investigators also called for a safety review of lithium-powered emergency locator beacons in all aircraft types.
According to the report by the Air Accidents Investigation Branch who is leading the investigation into a fire on a parked Ethiopian Airlines Dreamliner plane at Heathrow last Friday.
UK investigators say the source of a fire on an Ethiopian Airlines Boeing 787 Dreamliner at Heathrow last week was a battery for an emergency beacon.
The Air Accidents Investigation Branch is recommending that all emergency locator beacons in Boeing 787s should be switched off.
There is no evidence of a direct link between the Boeing 787 Dreamliner plane's batteries and a fire at Heathrow, according to air accident experts.
Ethiopian Airlines said it would continue to operate its fleet of Boeing 787 Dreamliners after one of them caught fire at Heathrow airport.
The company's public relations department said: "We have not grounded any of our aircraft. The incident at Heathrow happened while the plane was on the ground and had been for more than eight hours and was not related to flight safety."
Asked whether the airline has determined the cause of the fire, Ethiopian Airlines said: "There is no new development. No safety issue. The incident is being investigated to determine cause of smoke."
Air accident experts will continue their investigation today into the cause of a fire on board a Boeing 787 Dreamliner jet at Heathrow Airport which left thousands of passengers facing travel chaos.
Heathrow Airport has warned that there will be some cancellations and delays to flights.
The airport's website is advising passengers to check the status of their flight with their airline before travelling to Heathrow.
Polish airline Lot has said that it will continue to fly Dreamliners after the incident at Heathrow.
The Thomson Airways Dreamliner which departed Manchester airport for Florida is back at Manchester after being forced to turn back due to "a technical fault."