Principle of Assumed Temperature Reduced Thrust Takeoff

For correct and wide application of reduced thrust takeoff technique,the temperature characteristics of high bypass ratio turbofan engines and the takeoff performance of large aircrafts were analyzed.Assumed temperature is the equivalent ambient air temperature determined by the actual takeoff mass of an aircraft.The necessary conditions of reduced thrust takeoff are that the actual takeoff mass is less than the maximum takeoff mass of an aircraft and that the assumed temperature is higher than the reference temperature.The rotation speed of the fan under assumed temperature reduced thrust takeoff is calculated based on the analogical condition of engine.