Contact of Tanker American Liberty with Multiple Vessels

What Happened

On May 16, 2019, the fully laden product tanker American Liberty got underway with a pilot on the Lower Mississippi River, at mile 140.2 near Reserve, Louisiana, when the bridge team lost control of the vessel in the fast current, and made contact with moored vessels, barges, and wharfs along the left descending bank from miles 139.5 to 138.7 as it moved down river. Four injuries and no pollution were reported. There was a reported $40.5 million in damages to the vessels, barges, and terminals.

What We Found

​​The probable cause of the contact of the tank vessel American Liberty and multiple vessels, barges, and wharfs was poor bridge resource management and miscommunication between the pilot and the master, which led to the bridge team’s delay in carrying out an engine order and caused a delay in the vessel attaining sufficient speed to conduct an undocking maneuver in high river conditions. Contributing to the accident was the decision to release the assisting tugs before the undocking maneuver was completed.

Lessons Learned

​​Bridge Resource Management (Communications)

The pilot and the bridge team should share the same mental model for the maneuver and fully understand the planned tasks. Communications should be open, involve discussion of the intended maneuvers, and should continue throughout the evolution. Clear orders and ​commands should be acknowledged and carried out promptly.

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