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8. Repeat steps 3. through 7. as required to required.
boresight each sensor and field of view.
NOTE
9. LASER ARM/STBY/OFF switch Set as
required. After selecting an operational mode, if the
REBORESIGHT message remains,
accomplish a manual boresight.
4-11. MMS AUTOMATIC BORESIGHT.
NOTE 4-12. MMS PILOT SWITCHES.
Pilot MMS mode select key enables pilot to view video
• If required, TIS setup procedures should from MMS. TVS/TIS line address will permit sensor
be performed prior to boresighting to selection independent of CPG selection. If pilot and
obtain proper TIS picture. CPG view different sensors, pilot MFD will not include
4-31
TM 1-1520-248-10
MMS symbology. Pilot MMS FXD FWD switch will
select and deselect override of all CPG directional
commands to MMS turret. When FXD FWD is selected,
MMS LOS is slewed to a position fixed at 0° azimuth
and 0° elevation to fuselage reference plane. In
addition, TIS W HOT wide field of view is selected.
1. MMS FXD FWD switch Press.
2. MMS FXD FWD switch Press again to
deselect.
CAUTION
Do not use excessive force on LOS CONT
switch as calibration could be adversely
affected.
4-13. TIS WINDOW HEATER.
If TIS window heater is causing image distortion
because of extreme cold, disable window heaters as
follows:
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
SET UP
BRST COMPLETE
BRST
AUTO
BRST
MAN
GRAY
SCALE
406075-1405
J1145
PREFLT
Figure 4-16. Acceptable Track Gate/Spot 1. INIT button Press.
Relationship TV Spot
2. PAGE 2 Press.
3. MMS WINDOW HEATER Press.
4-14. MMS WINDOW HEATER OPERATION.
Each sensor window in the upper shroud is electrically
heated to 105 °F (41 °C) when power is applied to the
MMS. After a 10-minute purge at that temperature, the
TVS window is regulated at 10° above the turret
internal air temperature and the TIS window heater is
automatically turned OFF. The TIS window heater is
normally OFF, because the optical characteristics of
the window will change while heat is applied and this
can affect designation accuracy. The operator can
reheat the TIS window by keyboard entry or by
selecting the MMS WINDOW HEATER switch on
INITIAL PAGE 2. If the operator reactivates the window
heat, the TIS window heater will automatically shut off
when the temperature reaches turret air temperature
plus 10°.
NOTE
When the window heater cycles ON, a
PULL
MAN
PULL
BKUP
BRT
C
ONT VSD HSD MMS COMM
SET UP
BRST
AUTO
BRST
MAN
GRAY
SCALE
PREFLT
406075-1406
J1145
BRST
defocusing effect is likely to occur. This
Figure 4-17. Acceptable Track Gate/Spot effect will last from 2 to 10 seconds until the
Relationship TIS Spot heater cycles OFF.
4-32
TM 1-1520-248-10
4-15. MMS STOW PROCEDURES. 4. LOS CONT switch Trim LOS as desired.
NOTE 4 - 1 8 . MMS S E A R C H ( S R C H ) M O D E
In order to save the MMS boresight and PROCEDURES.
diagnostic data, place MMS in the stow
position. When the data is saved, an MMS NOTE
message on the MMS page will appear
stating STORE COMPLETE. Turn MMS off The search pattern, once selected, will
before reducing throttle to idle. The AC remain directly related to the azimuth/
generator will drop off line when the rotor elevation pointer, regardless of helicopter
speed is reduced below 91 percent. heading or attitude.
1. MMS key Press. 1. MMS key Press.
2. MMS mode select switch SRCH.
2. MMS mode select switch STOW. MMS
turret rotates to aft viewing position.
3. LOS CONT switch Aim LOS at desired
search area.
3. After 1 to 3 minutes, MFD displays STORE
COMPLETE. 4. RAST/SPRL key As desired.
CAUTION 5. SLOW/FAST key As desired.
Do not place MMS mode select switch to 6. MNL/SLAVE switch Press.
OFF u n t i l STORE COMPLETE i s
displayed. 7. When target is acquired on MFD, MNL/
SLAVE switch Press.
4. MMS mode select switch OFF.
8. LOS CONT switch Maneuver switch to
track target with LOS reticle.
4-16. PREPOINT (PREPT) OPERATING
PROCEDURES. 4-19. MMS AREA TRACK PROCEDURES.
1. MMS key Press.
1. MMS key Press.
2. MMS mode select switch PREPT. 2. MMS mode select switch FWD, PREPT, or
SRCH.
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(99)
