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The ship lost propulsion in its port shaft during the transit and the crew saw water intrusion in two of the four bearings that connect to Zumwalt’s port and starboard Advanced Induction Motors (AIMs) to the drive shafts, a defense official told USNI News on Tuesday. The AIMs are the massive electrical motors that are driven by the ship’s gas turbines and in turn electrically power the ship’s systems and drive the shafts.
Following its Oct. 15 commissioning, Zumwalt suffered additional unspecified engineering trouble around the time arrived at Naval Station Mayport, Fla. and spent extra time repairing and testing the propulsion system, USNI News understands.