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EX 46 Optical Sight

While still in development at this writing, some information is available on the EX 46 optical sight (OS). The sight is described as a stabilized imaging sensor. The OS will supplement the coverage of the sensors of the ship, allowing the operator to detect and track surface targets, support the engagement of counter-battery threats, and act as a safety check sight during gun operations.


The Mk 86 gun fire control system (GFCS) is a shipboard, digitally controlled system that directs gunfire against surface, shore, and air targets. The

system is designed to control the 5"/54 Mk 45 rapid-free gun mount currently found aboard various platforms, including the DD-963, DDG-993, CG-47, CGN-36, CGN-38, and LHA-1 class ships.

Variations of the system integrate it with the missile FCS of the ship. The ship can use the Mk 86 system to supply air target tracking and continuous wave illumination (CWI) for control of SM-1 missile engagements.

Other improvements enable the system to control SM-2 engagements. In this text, however, we will discuss only the gun control function of the system.

Refer to figure 10-12 as we describe the major components of the Mk 86 Mod 10 GFCS. For ease of discussion, the physical units are grouped into related functions as follows: l Operator consoles l Power central

. Computer/peripherals l Surface search radar

. Air action radar

. Data/video units l Optical sighting system

Figure 10-12.-Mk 86 Mod 10 FCS.

Operator Consoles

The operator consoles consist of the control officer console Mk 67 (COC, unit 1) and two Mk 113 weapons control consoles (WCC1 and WCC2, units 2 and 3). The COC and WCCs are the principal command positions for the Mk 86 FCS.

The COC allows the control officer to control and monitor overall operation of the FCS. From this position he initiates radar tracking of targets and assigns weapons to the WCCs.

An operator may control one or both guns from either WCC, depending on the weapon assignment made by the COC operator. The WCC operator enters tire control data into the computer through his keyboard and associated controls. This data includes ballistics data, ammunition selection, target data, grid coordinates, and spotting data. The WCC also has a TV monitor for visual surveillance and optical tracking.

Power Central

Power central (Mk 12, unit 5) is the central power control and distribution point for all units except the AN/SPG-60 radar set, the digital computer, and the digital input/output (I/O) console.


The systems computer/peripherals group consists of the AN/UYK-7 computer, the digital I/O console, and the magnetic tape recorder-reproducer. (These units are shown as units 7, 8, and 37, respectively, in fig. 10-12.)

DIGITAL COMPUTER AN/UYK-7.- The FCS uses the AN/UYK-7 general-purpose computer set. The program, once loaded into the computer memory, contains all instructions and constant data required to perform the computations and functions related to the fire control problem. The computer performs ballistic computations to determine the line-of-fire of the gun and the time-in-flight of the projectile from which gun orders are generated.

DIGITAL I/O CONSOLE.- The digital I/O console consists of a paper tape reader and perforator and a teletypewriter (keyboard/printer). The I/O console is primarily used for troubleshooting and for running system diagnostics.

MAGNETIC TAPE RECORDER-REPRODUCER.- The magnetic tape recorderreproducer (MTRR) interfaces with the AN/UYK-7 computer to load the operational and maintenance programs for the system. The MTRR also records all system engagements for future review.


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