Engine cooling issue sidelines LCS Sioux City March 12 The littoral combat ship Sioux City has been sidelined for several months after an issue with the engine cooling system was discovered in January, officials confirmed this week. (Navy) The littoral combat ship Sioux City is laid up after air was found in the ship’s lube oil, which could affect engine cooling and raise the risk of overheating, Naval Surface Force Atlantic officials confirmed this week. The problem was discovered Jan. 12 during routine maintenance aboard the ship, which was commissioned less than three years ago in November 2018. Initially, the repairs were only expected to take a few days, but officials now say they don’t have a timeline for when Sioux City will once again be good to go.