(CNN) Less than two days after the US Navy revealed a third mechanical breakdown in a year of one of its $360 million littoral combat ships, the service has announced a fourth. The USS Coronado was on its way back to Pearl Harbor, Hawaii, after suffering an "engineering casualty," a Navy statement said. It said it expected to reveal more about what happened after an inspection once the ship returned to port. The ship was heading to an independent deployment in the western Pacific when the mishap occurred. It had departed Hawaii on Friday. The Coronado was under its own power but traveling with the escort of the tanker USNS Henry J. Kaiser on the trip back to Hawaii, the statement said.USS Coronado suffers "engineering casualty" four days after leaving Hawaii"We must get these problems fixed now," chief of naval operations says
But the _'s incident means four of the six littoral combat ships in service have suffered mechanical failures in the past nine months. The _'s littoral combat ships come in two variants: the monohull and the trimaran, with three hulls.