What does a [L/R FUEL LO] annunciator indicate?

The [L/R FUEL LO] annunciator indicates that the fuel level in one or both fuel tanks has fallen below a certain threshold, specifically below 110 lbs. This warning is critical for pilots to ensure that they maintain fuel reserves and avoid running out of fuel, which could lead to unsafe situations during flight.

In this context, the option reflecting that the sensors detect fuel levels below 110 lbs most accurately captures the purpose of the annunciator. This warning prompts the crew to verify fuel status and potentially adjust flight plans or prepare for landings, ensuring safety and adherence to operational limits.

Understanding the fuel levels is essential for effective flight management, which is why this annunciator serves as an important safety alert for the aircraft crew.