Lord Bassam of Brighton:
The Air Accidents Investigation Branch (AAIB) investigation has identified that when the aircraft was at a height of approximately 700 feet, an increase power demand was received at both engine control units. Despite the correct operation of all engine control functions and sufficient fuel on board the aircraft, the engines did not respond.
AAIB Special Bulletin: 1/2008
The engines initially responded
but, at a height of about 720 ft, the thrust of the right engine
reduced. Some seven seconds later, the thrust reduced on
the left engine to a similar level.