Investigators examining the Boeing 777-200ER that crashed short of the runway at London Heathrow last month state that the twin-jet passed through two regions of particularly cold air during its flight from Beijing.

The Air Accidents Investigation Branch, in a progress bulletin on the inquiry, also says it is trying to identify the source of damage to the high-pressure fuel pumps in the aircraft’s engines.

Both engines on the aircraft failed to respond to auto-throttle requests for increased thrust during the final stages of the approach to Heathrow on 17 January.

During the approach, with the 777 at a height of just 720ft, thrust from the right-hand <A href=”http://www.rolls-royce.com/civil_aerospace/products/a

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