Ice crystals in the jet fuel were blamed Judgment_communication as the cause Causation of the accident Catastrophe , clogging Filling the fuel-oil heat exchanger ( FOHE ) of each engine .

The AAIB identified Check the problem as specific to the Rolls-Royce engine fuel-oil heat exchangers , and Rolls-Royce subsequently developed Coming_to_be a modification to its FOHE ; the European Aviation Safety Agency ( EASA ) mandated Arranging that all affected Influence aircraft were to be fitted Change with the modification before 1 January 2011 .