The cargo ship Dali experienced an electrical blackout about 10 hours before leaving the Port of Baltimore and yet again shortly before it slammed into the Francis Key Bridge and killed six construction workers, federal investigators said on Tuesday, providing the most detailed account yet of the tragedy.
The power outage occurred after a crewmember mistakenly closed an exhaust damper, causing the ship’s engine to stall, investigators with the National Transportation Safety Board said in their preliminary report. Shortly after leaving Baltimore, the ship crashed into one of the bridge’s supporting columns because another power outage caused it to lose steering at the exact worst moment.
The report provides new details about how the ship’s crew addressed the power issues it experienced while still docked in Baltimore. A full investigation could take a year or more, according to the safety board.
Testing of the ship’s fuel did not reveal any concerns related to its quality, according to the report.
After the initial blackout caused by the closed exhaust damper, investigators say a backup generator automatically came on. It continued to run for a short period — until insufficient fuel pressure caused it to kick off again, resulting in a second blackout. That’s when crewmembers made changes to the ship’s electrical configuration, switching from one transformer and breaker system it had been using for several months to another that was in use upon its departure, according to the report.