What is one of the indicators that the SPDS is in failsafe mode?

The reset prompt on the CDU (Control Display Unit) is a key indicator that the SPDS (Safety Protection and Diagnostics System) is in failsafe mode. When the system detects an anomaly or malfunction, it often triggers a reset prompt to alert the operator to the issue. This prompt indicates that the system is no longer operating under normal conditions and is instead defaulting to a failsafe state as a protective measure. In this mode, the SPDS is designed to maintain basic functionality while mitigating risks, thus ensuring safety and reliability for the operator and the equipment.

In contrast, the other options refer to potential outcomes or functions that would not be present in failsafe mode. Increased fuel efficiency or an engine performance boost are not characteristics of failsafe operation, as the system typically prioritizes protection over performance enhancements during malfunctions. Additionally, manual override activation is usually considered an action taken by the operator to regain control, which would not specifically indicate that the system is in failsafe mode. Instead, it may suggest a need to disengage from automated system functions due to perceived failure.