DP Mini Guide: Power — Blackout

Crew Connect DP Academy · Mini Guide 12

Power — Blackout

Topic: Power Generation · Sub-topic: Total Power Loss  ·  Level: DPO / Senior DPO  ·  Read time: 9 min

1. What / Why / How

A total blackout means all generators trip, all thrusters lose power, and DP control is lost entirely — not degraded, gone. The first priority is recognising this as a total loss of position-keeping capability requiring immediate safety actions per the emergency response plan, while the engine room begins blackout recovery in parallel.

2. Recognition / Risk / But

The risk beyond position loss itself: uncontrolled drift under wind/current toward nearby structures, other vessels, subsea infrastructure or personnel in the water/subsea. But: before assuming recovery follows a predictable pattern, confirm whether your vessel's procedure requires a specific black-start sequence — restoration is typically staged, not instant.

3. Now / What next / Decision / Why

As power returns in stages — one generator online, partial thrusters — assess actual restored capability against current conditions and vessel drift/position before making any decision to resume DP control. Partial power doesn't mean full capability.

4. Consequence / Reassess / Escalate

Full power restored and holding position doesn't end the event: verify actual current position/heading against where the vessel should be, confirm root cause is understood (not just that power returned), and complete a full incident report.

5. Recover / Verify / Human factor

Even a root cause found to be a mere nuisance trip doesn't make the event less worth reviewing — the vessel's actual response is exactly as valuable to examine regardless of how serious the underlying cause turns out to be. Trap: treating restored position-holding as proof the event is fully closed.

Sources: IMO MSC.1/Circ.1580, IMCA M103 Rev.5.2, IMCA M166 Rev.3, MTS TECHOP Blackout Recovery. This guide is educational content, not a substitute for accredited DP training, vessel-specific FMEA/ASOG, or full-mission simulator assessment. Crew Connect never infers compliance with a specific vessel's applicable requirements — always verify against your own approved documents.