Boeing 747-8 System Practice Exam

Auto-relight protection is provided for flameout and rollback. When is auto-relight activated?

Activated when engine flameout or rollback is detected by the EEC; igniters are activated Activated only during water ingestion Activated when EGT exceeds limit Activated during maintenance tests

Correct Answer:

Activated when EGT exceeds limit

Explanation:

Auto-relight protection is tied to the engine’s monitoring of combustion health. The control logic triggers ignition to try to re-light when the Exhaust Gas Temperature reaches or exceeds its preset limit. This threshold-based signal ensures that, if flame is lost or combustion cannot be sustained (flameout or rollback), the igniters are energized to attempt a re-light and restore stable operation. It isn’t limited to water ingestion or maintenance tests, and it isn’t based on flameout detection alone without the EGT limit being reached.

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