Electrical failure leading to loss of steering on bulk carrier

Background image: J Claverie
Background image: J Claverie

An electrical failure caused a bulk carrier to lose steering and crash into a barge near New Orleans last year, resulting in an estimated $6 million in damages, the National Transportation Safety Board (NTSB) report reveals.

The bulk carrier Jalma Topic was transiting upriver on the Lower Mississippi River on July 12, 2021, when it lost steering and struck a stationary barge that was being used for office space. No injuries were reported.

During the voyage, the rudder became stuck at port 10 degrees. According to the report, when the pilot noticed the rudder was not responding he took immediate and effective action to ensure the people on board the office barge were warned of the situation, and attempted to slow the vessel as much as possible.

The barge sustained damages to its superstructure and hull. Electrical, plumbing and communication connections to the shore were severed, and the heating ventilation and air conditioning systems were damaged. The mooring system and all gangways and surrounding catwalks to the barges were also either damaged or destroyed.

During the NTSB’s investigation, a technician found that a solid-state relay on the operating steering control system servo control board had failed, causing the loss of steering. In addition, the investigation found the steering control system manufacturer, YDK Technologies, had created a caution sticker and released an important notice to vessels with PT500 autopilot systems in December 2014 that addressed the failure experienced on the Jalma Topic. However, the vessel’s operator stated they were not notified of the 2014 notice and caution sticker from YDK Technologies until after the contact.

The NTSB determined the probable cause of the contact of the Jalma Topic with the office barge was a loss of steering due to the failure of an electrical solid-state relay on the servo control board of the operating control system to the steering gear. Contributing was the lack of specific procedures available to the bridge team to respond to a failure of the steering control system.

Download the report: MIR-22/23

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