What can trigger an alarm in a fuel control system?

An alarm in a fuel control system is designed to alert operators to any operational irregularities that could pose a risk to safety or system functionality. A failure to operate correctly is a critical condition that can lead to serious consequences, such as leaks, pressures that are too high or too low, or equipment malfunction. Thus, when a system detects that it is not functioning as designed—whether that be due to mechanical failure, sensor errors, or other anomalies—this triggers an alarm to ensure immediate attention and corrective action is taken.

In contrast, successful defueling, consistent flow rates, and regular pressure adjustments indicate that the system is operating within the desired parameters and typically wouldn't necessitate an alarm. These conditions reflect normal operational capabilities rather than issues that would require immediate intervention.