Engines Auxiliary Power Unit (APU) Practice Exam

When engine flameout is detected by the EEC, which igniters are activated?

Only the left engine igniter is activated Both engine igniters are activated Igniters are deactivated No action

Correct Answer:

Both engine igniters are activated

Explanation:

When the EEC detects a flameout, it automatically attempts a relight by energizing both igniters. Having two igniters provides redundancy and increases the chance of a successful re-ignition under varying conditions, such as lean mixtures or unstable flames. Using only one igniter could fail if that unit has a fault or isn’t producing enough energy, so energizing both improves reliability and speeds restoration of the flame. The system continues to monitor engine parameters and will retry as needed until the engine stabilizes or safety limits dictate otherwise.

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