BAE Systems to supply four upgraded Mk 45 mod 4 gun mounts to U.S. Navy

BAE Systems Land & Armaments LP, Armament Systems Division is being awarded a contract modification to provide four upgraded and overhauled Mk 45 mod 4 five-inch/62 caliber gun mounts.

The modification, valued at around 47 million, was awarded by the U.S. Naval Surface Warfare Center Indian Head Explosive Ordnance Disposal Technology Division (NSWC IHEODTD) located in Indian Head, Maryland. Fiscal 2017 weapons procurement (Navy) funding for the amount will be obligated at time of award and will not expire at the end of the current fiscal year.

This modification is to fulfill specified requirements and technical performance requirements for the Mk 45 mod 4 gun system requirements.

The Mk 45 gun system provides an effective weapon for anti-surface warfare, naval surface fire support and anti-air warfare missions on DDG 51-class destroyers and CG 47-class cruisers.

Work will be performed in Louisville, Kentucky, and is expected to be completed by January 2021.

5″/62 caliber Mark 45 Mod 4 gun

The 5-inch/62 caliber Mk 45 is a modern U.S. naval artillery gun mount consisting of a 127 mm (5 in) L62 Mark 36 gun on the Mark 45 mount.

It is the latest version (Mod 4) of the 5-inch/54 caliber (Mk 45) lightweight gun which consists of a 127 mm (5 in) L54 Mark 19 gun on the Mark 45 mount. Originally designed and built by United Defense, it is now manufactured by BAE Systems Land & Armaments after the former was acquired.

The gun is designed for use against surface warships, anti-aircraft and shore bombardment to support amphibious operations. The Mk 45 Mod 4 provides Naval Surface Fire Support (NSFS) range of more than 20 nautical miles (36 km) with the Navy’s new 5-inch Cargo projectile and an improved propelling charge.

In United States Navy use, the Mark 45 is used with either the Mk 86 Gun Fire Control System (GFCS) or the Mk 160 Gun Computing System (GCS).

For sustained use, the gun mount would be occupied by a six-man crew (gun captain, panel operator, and four ammunition loaders) below deck to keep the gun continuously supplied with ammunition. In fully automatic non-sustained firing operations (Mode IV), the gun can be fired without any personnel inside the mount. However, sustained fire is limited to the capacity of the automatic loader (20 rounds).

Starting with USS Winston S. Churchill (DDG-81), Mk 45 Mod 4 is being forward-fit to U.S. Navy DDG 51 Arleigh Burke-class destroyers. Existing Mk 45 Mod 0-2 mounts can be upgraded to the Mod 4 configuration, which is planned for CG 47 Class ships as part of the Navy’s Cruiser Modernization Program.

Other Mod 4 applications include installations for the fleets of South Korea, Japan and Denmark.

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