What is the primary role of the FADEC during an engine start?

The primary role of the Full Authority Digital Engine Control (FADEC) during an engine start is to control fuel flow and timing. FADEC is an advanced electronic control system that manages various engine parameters to optimize performance and efficiency. During the start phase, it ensures that the proper amount of fuel is delivered to the engine at the right time to facilitate a successful ignition and subsequent engine operation.

This control is critical because it not only affects the engine's performance but also plays a vital role in preventing potential issues such as engine stalls due to improper fuel flow or timing. By managing these parameters precisely, FADEC enhances the reliability and safety of the engine start process.

While monitoring engine temperature, activating thrust reversers, and boosting engine performance are important functions of FADEC in different phases of operation, they are not the primary focus during the initial engine starting process. Monitoring temperature is crucial for overall engine health but is secondary to the immediate need for correct fuel and timing management during start-up.