The Air Accidents Investigation Branch (AAIB) have updated their report on Boeing 777-236, G-YMMM which crashed at Heathow with an " Initial Report Update".
They report that based on data from the flight recorders there was "adequate" fuel on board and that , " whilst the aircraft was stabilised on an ILS approach with the autopilot engaged, the autothrust system commanded an increase in thrust from both engines. The engines (Rolls-Royce Trent 800 engines) both initially responded but after about 3 seconds the thrust of the right engine reduced. Some eight seconds later the thrust reduced on the left engine to a similar level. The engines did not shut down and both engines continued to produce thrust at an engine speed above flight idle, but less than the commanded thrust."
They also report that ,"the autothrottle and engine control commands were performing as expected prior to, and after, the reduction in thrust."
Consequently they are undertaking , "a detailed analysis and examination of the complete fuel flow path from the aircraft tanks to the engine fuel nozzles" with Boeing, Rolls Royce and British Airways staff.
The accident has resulted in a curious story reported in the Sun of a Susan Archibald calling BA lost luggage ten weeks ago and being put through to a 777 pilot about to take off from Heathrow for Los Angeles.