With the start selector switch OFF, auto-relight capability activates both igniters when the EEC detects an engine flameout.

With the start selector switch OFF, auto-relight capability activates both igniters when the EEC detects an engine flameout.

• A. EEC detects engine flameout
• B. EEC detects engine overtemperature
• C. EEC detects high N2
• D. EEC detects low fuel pressure

Answer: (A)

The key idea is how auto-relight responds to a flameout. When the Engine Electronic Control (EEC) detects that the combustor flame has been lost, it triggers the auto-relight sequence to reignite the engine. With the start selector switch in the OFF position, the system still uses that flameout signal to initiate ignition attempts, and it energizes both igniters to maximize the chance of a successful re-light. Other conditions listed don’t indicate a flameout and thus aren’t the trigger for auto-relight. An engine overtemperature is a protective fault that leads to cooling or shutdown actions, not a reignition. A high N2 reading is a speed abnormality, not a flame-out signal. Low fuel pressure points to fuel supply issues and may cause problems, but the relight logic relies on actual flameout detection by the EEC rather than this condition alone.

The key idea is how auto-relight responds to a flameout. When the Engine Electronic Control (EEC) detects that the combustor flame has been lost, it triggers the auto-relight sequence to reignite the engine. With the start selector switch in the OFF position, the system still uses that flameout signal to initiate ignition attempts, and it energizes both igniters to maximize the chance of a successful re-light.

Other conditions listed don’t indicate a flameout and thus aren’t the trigger for auto-relight. An engine overtemperature is a protective fault that leads to cooling or shutdown actions, not a reignition. A high N2 reading is a speed abnormality, not a flame-out signal. Low fuel pressure points to fuel supply issues and may cause problems, but the relight logic relies on actual flameout detection by the EEC rather than this condition alone.