If the FADEC detects a non-normal condition during an automatic start with N2 below 50%, what will happen?

When the Full Authority Digital Engine Control (FADEC) detects a non-normal condition during an automatic engine start and the N2 (a measure of the engine's rotational speed) is below 50%, it will initiate an automatic abort of the start sequence. The FADEC is programmed to ensure the engine is operating within safe parameters, and if it finds any abnormal conditions at this critical phase, it will prioritize safety by taking action to prevent any potential damage to the engine or other systems.

As part of this response, the FADEC will enter a state where it not only aborts the start but also engages an auto-crank feature, which continues to crank the engine without initiating fuel flow. This auto-cranking allows the engine to spin up in order to clear any potential issues that might have caused the non-normal condition, or to prepare for a subsequent start attempt once the abnormal condition is addressed.

This process emphasizes the advanced capabilities of the FADEC system in managing engine operations effectively during automatic starts, thus enhancing safety and operational integrity.