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3. Azimuth caret and numerals Direction and degree of MMS lateral LOS offset from fuselage
reference.
4. Elevation caret and numerals Direction and degree of MMS vertical LOS offset from fuselage
reference.
5. Prepoint reticle Appears over a preselected target.
6. Acquisition cursor Symbol used to attempt to track (acquire) a target.
7. Scale Appears when VIDEO switches on control panel are set to manual
and VIDEO rocker switches GAIN, LEVEL, and FOC are actuated.
Bottom of scale represents 0% and top 100% of adjustment range.
8. Scale cursor Indicates adjustment value.
9. Secondary target gate Appears around secondary targets being tracked by MMS.
10. Transition gate Appears around transition target being tracked by MMS.
11. MMS status block Reports status of MMS.
12. Magnification indicator block Indicates degree of magnification [1X(blank), 2X, or 4X] in TIS and
TVS.
13. Autocue Appears as moving target indicator around potential targets.
14. MMS operational mode status Indicates the current operating mode of MMS.
block
15. Present position block Displays continuously updated report of helicopter current position.
16. NFOV limit TIS Indicates the edge of field of view when placed in NFOV mode.
17. NFOV limit TVS Indicates the edge of field of view when placed in NFOV mode.
18. Laser hit point reticle Selects and permits LOS to be directed to an offset and represents
laser hit point when joined with LOS reticle.
19. Primary target gate Appears around primary target being tracked by MMS and indicates
MMS lock-on.
20. Laser status block Upper portion displays selected laser code. Lower position displays
laser system status (STBY/ARM).
21. LOS reticle Represents LOS of MMS optics and laser hit point. See inset for
symbol of LOS reticle when in Manual Track and Area Track.
22. Waypoint bearing indicator Displays bearing of aircraft.
Figure 4-3. Composite CDS and IMSP/MMS Multifunction Display Symbology (Sheet 2 of 2)
4-9
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
1. TV/TIS Selects desired sensor image to be displayed on CPG MFD.
2. DESIG Indicates whether lasing is for offset navigation update or target
locate designation. Down for target locate, up for offset navigation
update.
3. LOS CONT Permits manual positioning of the MMS LOS in direction switch is
moved.
The direction of vertical movement can be reversed by making an
entry on the MFK. Power up constants will default to constants
previously set.
4. MNL/SLAVE Selects operating mode set by MMS mode select switch, if manual
track is being used. Selects manual track while in any other OPR
mode.
Figure 4-4. CPG Cyclic Grip Controls (Sheet 1 of 2)
4-10
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
5. AREA TRK Locks MMS LOS on total scene being displayed.
6. LASER Fires laser providing that all interlock requirements have been
satisfied.
7. FOV SEL Controls field-of-view and zoom level for TV and TIS as follows:
Pressing switch up selects WIDE FOV.
Pressing switch down selects narrow FOV.
Once FOV is selected, additional presses in the same direction (up
or down) cause the zoom level to change from 1X to 2X and back to
1X for the MMS, or from 1X to 2X to 4X and back to 1X for the
IMSP.
When the FOV is changed from wide to narrow or narrow to wide,
the zoom level does not change.
8. FR FRZ Stops (freezes) the image movement on MFD at last scene
displayed (TIS) only.
9. TGT SEL* Selects transition target.
10. PNT TRK Locks MMS LOS on target which is at center of display.
* On helicopters configured with IMSP.
Figure 4-4. CPG Cyclic Grip Controls (Sheet 2 of 2)
4-11
TM 1-1520-248-10
TABLE 4-1. MMS ADVISORIES
ADVISORY MEANING
BRK LOCK Mast mounted sight system processor video tracker is no longer tracking target.
BRST Displays when automatic boresight (AUTO BRST) is in process.
BRST COMPLETE Displays when automatic boresight (AUTO BRST) is complete. It does NOT imply
a successful boresight.
COOLANT LOW Displays when cooling unit fails BIT.
DSC FAIL* MMS BIT (built-in test) has detected a failure in the digital scan converter. If TIS
video is not usable, the DSC may be reset by turning TIS power OFF (Preflight
Mode, Setup page, R-2) for 10 seconds and back on.
IMPEND BRK LOCK MSP video tracker is losing target. Operating the LOS control with this message
present will cause the MMS to revert to track acquisition mode.
IMPEND LSR INHBT MMS line of sight is approaching tail rotor where laser firing is inhibited.
INVALID STORE Displays if improper STOW procedure is used. Mission data for that MMS power
　
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