What is the function of a fuel control unit (FCU)?

The function of a fuel control unit (FCU) is to regulate fuel flow to the engine based on various inputs. This involves adjusting the amount of fuel injected into the combustion chamber considering several operational parameters, such as engine speed, altitude, temperature, and power demands. By carefully controlling the fuel flow, the FCU ensures optimal engine performance, efficiency, and emissions control. The FCU plays a critical role in achieving the correct air-fuel mixture, which is essential for both performance and fuel efficiency during different operating conditions.

While managing engine temperature, converting fuel into energy, and monitoring engine RPM levels are important aspects of engine operation, they do not encapsulate the core role of the FCU like fuel regulation does. The FCU's primary responsibility focuses on fuel management to meet the engine's operational needs.