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A fire on a parked Boeing 787 Dreamliner jet at Heathrow Airport two years ago was probably caused by a short circuit, air accident investigators have said.
The fire was likely to have been started by two bare wires touching in a piece of location equipment, the UK Air Accidents Investigations Branch said.
It then spread through the cabin and burnt through the fuselage.
Investigators recommended tighter testing and certification of devices.
The piece of equipment that caught fire - the Emergency Locator Transmitter (ELT) - was located near the back of the plane, and was made by Honeywell.