On a vessel classed for a periodically unmanned engine room, which of the below listed events will trigger the annunciation of the engineer's assistance needed alarm?

Correct Answer: Option B — Failure of the duty engineer to acknowledge an ECC alarm in a reasonable period of time.

On vessels certified for periodically unmanned engine rooms, the engineer's assistance needed alarm annunciates if the duty engineer fails to acknowledge an Engine Control Center (ECC) alarm within a specified allowable timeframe.