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Figure 6-17.–The 5"/54 Mk 45 gun loading system, major components.
to quickly and accurately identify the various
ammunition types.
76-MM MK 75 GUN
The Mk 75 gun (fig. 6-18) is a fully automated,
remotely controlled gun mount that stows, aims, and
fires 76-mm 62-caliber ammunition. The 76-mm
system, along with the Mk 92 GFCS, is currently aboard
FFG-7- and PHM-class ships. The design of the gun
mount makes extensive use of lightweight
corrosion-resistant alloys and modern engineering
techniques. The result is a lightweight, compact,
fast-firing, versatile weapon. It is primarily a defensive
weapon, used to destroy antiship cruise missiles.
However, it can also be used effectively against surface
and shore targets. The gun has a variable rate of fire of
up to 80 rounds per minute with a range of up to 16,459
meters and a maximum altitude of 11,519 meters. The
most notable innovation featured on this system is the
automatic barrel cooling system. This cooling system
allows sustained operation at high rates of fire without
excessive barrel wear or the danger of a cookoff if a
misfire occurs.
The Mk 75 gun fires a somewhat limited variety of
ammunition types. The types of ammunition currently
available include point detonating (PD), infrared (IR),
radio frequency (RF), and blind-loaded and plugged
(BL&P).
6-21
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