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During a reduced thrust take-off, the assumed OAT is higher than the actual OAT. Which of the following statements is correct?

  • A
    The Air Data Computer limits the internal temperature of the engine to prevent from exceeding the temperature limit.
  • B
    The temperature at which this thrust would be produced can be extracted from the applicable weather chart..
  • C
    The reduced thrust value is the minimum thrust value that the engine will produce.
  • D
    The assumed temperature is entered in the Flight Management System.

A reduced thrust take-off is a take-off that is accomplished utilising less thrust than the engines are capable of producing under the existing conditions of temperature and pressure altitude. The procedure can be used any time the actual take-off mass is less than the maximum permissible take-off mass and there is an available distance that greatly exceeds that which is required.

The limitation is posed on the engine computer by inputting a flexible thrust temperature for the engine, which essentially tells the engine computer an artificial outside air temperature that is higher than the actual temperature. This way the engine computer believes that the entering air is hotter than it really is.

At outside air temperatures above the flat rated temperature, there is a specific thrust value (variable by pressure altitude) for each temperature. If the thrust requirement for the take-off is known, the associated temperature at which this thrust would be produced can be extracted from the applicable charts. This "assumed" temperature is then entered into the FMS.

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