Which of the following would cause an ENG THR LEVERS NOT SET warning during takeoff?

The condition of having the thrust levers in the FLX/MCT detent without a flex temperature entered on the TAKEOFF performance page directly leads to the ENG THR LEVERS NOT SET warning during takeoff. In this scenario, the thrust setting that pilots are attempting to use for takeoff is undefined because the required flex temperature has not been specified.

When the thrust levers are positioned in the FLX/MCT detent, the aircraft’s systems expect a flex temperature to optimize thrust for the takeoff phase while considering engine performance and environmental conditions. The absence of a flex temperature means the system cannot calculate the appropriate thrust limits, prompting the warning. This is crucial for ensuring safe takeoff performance, as accurate thrust settings are essential for both the aircraft’s performance management and compliance with operational limits.

The other scenarios do not lead to the ENG THR LEVERS NOT SET warning since they involve either appropriate settings or conditions that do not trigger the alert. For example, if thrust levers are in the TOGA detent with no required data entered, the aircraft will still operate in the expected performance envelope but without the need for additional variables like those required in the FLX configuration. Similarly, having a flex temperature that exceeds the outside air temperature does