Fuel tanks of civil aircraft are generally designed with a symmetrical layout,where internal leakage can result in difference in fuel quantities between the two sides.During flight,if the fuel imbalance grows to a certain threshold,the fuel imbalance alarm will be triggered.It requires the crew to eliminate the abnormal alarm informa-tion operate according to the abnormal procedures in the flight crew operation manual,which affects the crew's at-tention and is not conducive to flight safety.For the fuel imbalance alarm information of a certain type of aircraft during route operation.Firstly,the basic structure of the fuel system is introduced.Then,the causes of the fuel im-balance alarm were analyzed based on fault tree and enhanced airborne flight recorder(EAFR)data.Finally,tem-porary solutions that do not affect route operation and subsequent optimization suggestions are put forward.To pro-vide the reference for troubleshooting and aircraft design optimization.
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