When do fuel level sensors activate caution messages in the cockpit?

Fuel level sensors in the T-6B are designed to monitor the aircraft's fuel levels and ensure safe operation. The caution messages are activated when the fuel quantity drops below a critical threshold to alert the pilots to potential issues that may arise from low fuel levels.

In the T-6B, the caution messages are triggered when the fuel quantity falls below 110 lbs. This specific threshold is significant because it allows pilots to have enough time to manage their fuel usage and make decisions regarding landing and refueling, ensuring safe operation even as fuel levels decrease. Being alerted at this level is crucial to avoid running out of fuel during flight, which could lead to a loss of control and require emergency procedures.

The other options suggest different thresholds, but only the 110 lbs threshold is the correct activation point for caution messages in this aircraft, aligning with safety protocols and operational guidelines.