The US Navy Los Angeles-class nuclear-powered submarine USS Boise (SSN 764) is set to undergo an engineered overhaul (EOH).

As part of this, it has moved from Naval Station Norfolk, Virginia, to Huntington Ingalls Industries’ (HII) Newport News Shipbuilding division in Newport News, Virginia.

The vessel will commence pre-maintenance smart start activities in preparation for its EOH.

Following the nearing of mid-point of a submarine’s service life, a major multi-year EOH is performed.

The EOH includes all necessary repairs, maintenance and modernisation.

Once repaired, the submarine will be certified for unrestricted operations. This will further ensure the submarine continues to operate at full technical capacity and mission capability, improving the efficiency of the mission.

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In June 2018, the Newport News Shipbuilding division of HII commenced the scheduled upgrade work on the SSN 764 submarine.

According to the contract, following the vessel’s arrival at the Newport News shipyard, the company was to carry out an extended EOH.

The modernisation project will involve upgrade works to be carried out on the existing systems on-board the vessel and is scheduled for delivery by 2021.

In October 2017, the shipbuilding company HII’s Newport News Shipbuilding division won a $59.7m contract to plan and carry out the upgrade of the US Navy’s USS Boise.

The contract was awarded by the US Navy. The deal included several additional options with a ceiling value of $385m.

So far, 62 Los Angeles-class submarines have been completed, including 41 that are in active service.