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CHAPTER 4
MISSION EQUIPMENT
SECTION I. MISSION AVIONICS
4-1. GENERAL. provided. The LRF/D is used for target designation and
range f o r t a r g e t i n g o r n a v i g a t i o n w a y p o i n t
(CDS2) Mission avionics consists of the Mast Mounted determination.
Sight (MMS) Subsystem, Airborne Target Handover
System (ATHS), Airborne Video Tape Recorder a. MMS Description. The MMS consists of three
(AVTR), Data Transfer System (DTS), ANVIS Display major components: turret assembly, central power
Symbology Subsystem (ADSS), and Electronic supply, and system processor.
Countermeasures (radar/laser detecting, warning, and ( 1 ) T u r r e t Assembly. The MMS T u r r e t
jamming equipment). Assembly (MTA) includes a platform assembly, a
Mission avionics consists of the Mast Mounted payload assembly, and an upper shroud. The
Sight (MMS) Subsystem, Improved Data Modem (IDM), stabilized, vibration-damped sensor support structure
Airborne Video Tape Recorder (AVTR), Data Transfer contained in the platform assembly is capable of
System (DTS), ANVIS Display Symbology Subsystem movement in three axes. The payload assembly, which
(ADSS), and Electronic Countermeasures (radar/laser is mounted on the sensor support structure, includes a
detecting, warning, and jamming equipment). TIS, TVS, and LRF/D which are used to acquire and
track targets or for target ranging and designation. The
CAUTION mast support post contains a thermal conditioning unit
(TCU) for cooling components in the MTA.
Operation of the mast mounted sight by (2) Central Power Supply. The Mast Mounted
u n q u a l i f i e d personnel may cause Sight Central Power Supply (MCPS) accomplishes the
equipment damage. following:
4 - 2 . MAST MOUNTED S I G H T ( M M S ) Converts normal helicopter power (115 Vac, 3-
SUBSYSTEM. phase, 400 Hz and 28 Vdc power) to the various
voltages used throughout the MMS.
WARNING
Performs switching functions controlling power to
both AC and DC loads.
To avoid permanent eye injury, avoid
direct eye exposure to AIM-1/MLR Laser Provides control voltages for positioning both the
(if installed) beam. The laser contains a payload assembly and the outer shroud.
Class IIIb invisible radiation source. (3) System Processor. The system processor
controls signal flow among all MMS components, CPG
NOTE cyclic grip controls, and video controls. The processor
also acts as an interface between the MMS sensors,
Do not use excessive force on LOS CONT MCPS, and the control and display system. There are
switch. two configurations of the system processor: the MMS
The MMS provides the ability to search, detect, system processor (MSP) and the improved MMS
recognize, track, locate, and designate ground targets system processor (IMSP).
in both day and night environments. The subsystem is
used with the cockpit control and display system (CDS) b. Functional Description MMS.
and embedded global positioning system/inertial (1) The CPG controls the subsystem through the
navigation system (EGI). The MMS is also used to MMS control panel (fig. 4-1), MFD (fig. 4-2 and 4-3),
hand over and cue target data. Targets are detected, cyclic grip control (fig. 4-4), and the multifunction
acquired, and tracked using either the thermal imaging keyboard (MFK). The MFD displays the screen
sensor (TIS) for infrared sensing during darkness and acquired by either the TVS or TIS. By using the line-ofpoor
visibility or a television sensor (TVS) during sight control (LOS CONT) switch on the CPG cyclic
daylight operations. In addition to these two sensor control, the turret is directed to point in any desired
subsystems, a laser rangefinder/designator (LRF/D) is direction, ±30° in elevation and ±190° in azimuth,
4-1
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relative to the fuselage reference plane. The MMS can CPG MFD in the MMS status block. Refer to Table 4-1
automatically search for targets and be slaved to the for a list of advisories. Advisories are continuously
fixed forward position. The LOS can also be prepointed displayed sequentially, one at a time, and f o r
to navigation waypoints provided by the master approximately 2 seconds.
controller processor unit (MCPU). An acquired target
can be tracked manually or automatically. As an aid to c. MMS Symbology (fig. 4-2 and 4-3).
the operator, the MFD displays information and status d. MMS Controls and Indicators. The primary
in the form of reticles, symbols, and alphanumeric data. operator of the MMS is the CPG. The pilot has limited
The MMS continually displays the azimuth and control as provided by the MMS FXD FWD switch on
elevation of line-of-sight (LOS) in a digital output. The the pilot cyclic grip (fig. 4-5). All other operations can
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(90)
