Final answer:
When the AutoThrust (A/THR) system is active, the normal operational position of the thrust levers is the idle or minimum thrust position. The A/THR system automatically controls engine thrust to maintain the desired speed and flight profile. The system adjusts the engine thrust based on factors such as aircraft speed, altitude, and autopilot settings.
Step-by-step explanation:
When the AutoThrust (A/THR) system is active, the normal operational position of the thrust levers is the idle or minimum thrust position. This means that the thrust levers are typically set to a position where the engines are providing the lowest amount of thrust possible.
The A/THR system helps to automatically control engine thrust to maintain the desired speed and flight profile. By default, when A/THR is engaged, the thrust levers are expected to be set to idle, and the system will adjust the engine thrust based on various factors such as aircraft speed, altitude, and autopilot settings.
For example, if the aircraft is descending and the speed decreases below the desired value, the A/THR system will increase the engine thrust to maintain the speed. Similarly, if the aircraft is climbing and the speed exceeds the desired value, the A/THR system will reduce the engine thrust.