How should you cancel an ENG THR LEVERS NOT SET caution during takeoff?

The appropriate action to cancel the ENG THR LEVERS NOT SET caution during takeoff is to advance the thrust levers to the TO/GA position. This is because the caution indicates that the thrust levers are not set properly for takeoff, which is a critical aspect to ensuring a safe and compliant takeoff procedure.

By moving the thrust levers to TO/GA, the engines are then set to maximum thrust, ensuring that full power is available as required during the takeoff phase. This action is essential for maintaining safety margins, particularly in case of an abnormal situation requiring maximum thrust.

Other actions, such as aborting the takeoff or selecting a FLEX temperature, would not directly address the caution and could compromise the takeoff process. Ensuring the thrust levers are in the FLX/MCT detent does not resolve the caution either, as it indicates a reduced thrust setting rather than the full thrust needed for takeoff. Therefore, advancing the thrust levers to TO/GA is the most appropriate and effective response to clear the caution and proceed safely with the takeoff.