What function of the FADECS automatically turns on the igniters when an engine flameout is detected?

The function of the FADEC (Full Authority Digital Engine Control) that automatically activates the igniters in response to an engine flameout is known as "Auto-Relight." This feature is designed to enhance engine reliability and safety by attempting to reignite the engine after a flameout event. When the FADEC detects a flameout, it triggers the igniters to fire and create the necessary conditions for the fuel to reignite, thus minimizing the aircraft's downtime and potential hazards associated with an uncommanded loss of thrust.

The use of "Auto-Relight" is particularly crucial in maintaining engine operability during flight, as immediate action can often restore thrust without requiring pilot intervention. This automatic function exemplifies the advanced technology embedded within FADEC systems, aiming to ensure the highest safety and efficiency standards in aircraft operations.