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Page Title: The 5"/54 Mk 45 Mod 0, General Arrangement
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Figure 6-16.–The 5"/54 Mk 45 Mod 0, general arrangement. ships. The Mk 45 (fig. 6-16) is a fully automatic, dual-purpose, lightweight gun mount capable of firing the   full   range   of   5"/54   projectiles,   including rocket-assisted projectiles (RAPs), at a rate of 17 to 20 rounds per minute. During normal operation the loading system (fig. 6-17), like the Mk 42, is operated locally by the mount captain; the gun laying, fuze setting, and firing orders are generated by the FCS. The gun may be positioned locally from the EP2 panel for maintenance only. The only manned positions on the Mk 45 gun during normal  operations  are  the  mount  captain,  who  operates the gun from the EP2 panel, and the loader room crew. The gun mount itself, unlike the Mk 42, is unmanned. There is no local firing position, as with the Mk 42 OMC. The mount power distribution panel, EP1, is also the  mount  captain's  responsibility. The loader drum holds a total of 20 complete rounds of  ammunition.  Before  an  operation,  the  loader  crew will load the drum, through the lower hoist, with 20 rounds  of  one  type  of  ammunition.  If  during  the operation another type of round is desired, the mount captain, using local controls, can allow the system to operate under alternate loading. This mode allows the loaders to hand-feed the different types of ammunition into the loading system, which automatically transfers only these rounds to the breech for firing. Depending upon  the  tactical  situation,  the  loader  crew  may  be required to load several different types of ammunition in a short time. The loader crew must, therefore, be able 6-20

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