The Boeing 777 airplane has been designed with a Thrust Asymmetry Compensation System (TAC). This system reduces flight crew workload during single-engine flight operation by automatically commanding rudder deflection to compensate for different levels of thrust between the left and right engines. The airplane is equipped with two Engine Data Interface Units (EDIU) which compute thrust based on engine parameters. This paper will describe the thrust calculation, the fault detection requirements and the resultant fault monitors, and the processes used to validate the EDIU logic.

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