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All signs indicated that the fuel flow to the engines had been lower than standard during the cruise phase due to specific conditions that had allowed ice crystals to accumulate in the fuel lines. When the aircraft initiated its final approach and called for an increase in thrust, the sudden demand dislodged these ice blockages, restricting fuel flow to the engines and causing the sudden engine power loss.
Lessons Learned and Changes Implemented
Following the investigation, both Rolls-Royce and Boeing took corrective actions. Improvements to the engine's fuel systems and additional pilot training were reinforced to mitigate risks associated with fuel icing. Since the modifications, there have been no further incidents of this nature involving the Boeing 777.