Which three parameters are monitored by the Fuel Control Unit (FCU)?

The Fuel Control Unit (FCU) plays a crucial role in the operation of turbine engines by managing the flow of fuel based on various parameters to ensure optimal performance and efficiency. The correct answer highlights three specific parameters that the FCU actively monitors: compressor inlet temperature, compressor pressure, and engine RPM.

Monitoring compressor inlet temperature is essential for managing fuel flow, as the temperature impacts the density of the incoming air and consequently the air-fuel ratio required for efficient combustion. Additionally, compressor pressure provides information about the engine's overall performance and helps the FCU adjust fuel flow to match the pressure in the engine, ensuring that the combustion process remains stable and efficient under varying operating conditions.

Engine RPM is another critical parameter, as it reflects the speed at which the engine is operating. The FCU uses this information to adjust fuel flow to maintain the desired power output and to prevent over-speed conditions. By constantly monitoring engine RPM, the FCU can rapidly respond to changes in engine load and atmospheric conditions.

In summary, the combination of these parameters allows the FCU to optimize fuel management, which is vital for maintaining engine efficiency, performance, and reliability during operation.