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the backup mode. The following default conditions will 1. MASTER switch STBY.
exist while operating in the backup mode:
O 2. PDU BIT Accomplish.
WARNING
3. WEAPON SEL switch Select WEAPONS
Air burst rockets will default to detonate PAGE.
at minimum range. Do not fire air burst
rockets. 4. R-5 Press to select WEAPONS BIT/SETUP
PAGE.
1. Fuzing will be CONTACT SUPERQUICK.
5. R-4 Press to select ROCKET TYPES by
ZONE MENU.
2. Zone will be ALL.
6. Warhead Enter ZONE A type followed by
3. One firing impulse per press of the WPNZONE
B type.
FIRE switch.
e. R MCPU FAILURE. R MCPU failure will 7. R-5 Press to return to WEAPONS PAGE.
cause the system to default allowing the system to be
operated in the backup mode. The following default 8. L-4 press to enter AIRBURST FUZE/CUE
conditions will exist while operating in the backup DISTANCE as required.
mode:
9. L-5 Press to enter CONTACT FUZE/CUE
1. Fuzing will be AIRBURST 2250 meters. DISTANCE as required.
2. Zone will be ALL. 10. Rocket sparse VSD Select.
3. One firing impulse per press of the WPN- 11. MODE Select as required.
FIRE switch.
12. ZONE Select as required.
4-86
TM 1-1520-248-10
Figure 4-47. 2.75 Inch Rocket System
4-87
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
NOTE
(CDS4) Normal VSD weapons pages are no longer available for display.
1. MMS LOS Cue Shows MMS azimuth and elevation orientation.
2. ZONE key Selects ALL, A, B. Selection of zone also changes FUZE to display current
rockets selected for the indicated zone. If ALL selected, then ZONE A FUZE
is the default display.
3. FUZE/CUE key Data entry fields for rocket fuze distance. Airburst data enters initial setting
for rockets with airburst fuzes. Contact data enters initial setting for rockets
with contact fuzes.
4. MODE key Selects firing mode for 2.75-inch rockets:
One launcher installed:
SINGLES/SINGLES: Fires one rocket in selected zones(s) per press
of WPN-FIRE switch.
Figure 4-48. 2.75-inch Rocket Normal VSD (Sheet 1 of 2)
4-88
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
RIPPLE/SINGLES: Fires rockets in selected zone(s) continuously per press
of WPN-FIRE switch until zone(s) is expended or WPN-FIRE switch is
released.
Two launchers installed:
SINGLES/SINGLES: Fires one rocket in selected zone(s) per press
of WPN-FIRE switch. Subsequent presses of WPN-FIRE switch
alternate launchers.
SINGLES/PAIRS: Fires rockets in pairs from both launchers
simultaneously in selected zones.
RIPPLE/SINGLES: Fires rockets from selected zone(s) continuously from
alternating launchers until zone is expended or WPN-FIRE switch is
released.
RIPPLE/PAIRS: Fires rockets in pairs from both launchers simultaneously in
selected zone(s) until zone(s) is expended or WPN-FIRE switch is released.
5. WEAPON STATUS Indicates OFF, SAF or ARM.
Figure 4-48. 2.75-inch Rocket Normal VSD (Sheet 2 of 2)
4-67. IN-FLIGHT PROCEDURES. b. ZONE Verify as required.
1. CPG. c. FUZE/CUE data Verify as required.
a. Target Track with MMS as desired. d. MODE Verify as required.
NOTE NOTE
Range may be estimated. Rocket ranges up to 8000m are now
possible to enter and get a displayed pitch
b. Laser range finding Complete as desired. attitude cue (PAC) for contact rockets.
However, at approximately 7600m the PAC
c. WPN/ASE switch Select rocket sparse is displayed at +30° pitch. At 8000m the
weapons VSD. PAC exceeds the maximum pitch attitude of
+30° by 3-5° (depending on rocket type).
d. ZONE key Select zone as required. Rocket engagements (simulated or actual)
at ranges above 7000m require extreme
e. FUZE/CUE key Enter fuze and cue data nose high attitudes (in excess of +20°).
as required. Ranges above approximately 7600m
(depending on rocket type) require pitch
f. MODE key Select f i r i n g mode as attitudes in excess of +30°.
required.
e. Position helicopter to properly align
g. MASTER switch ARMED. weapons symbology.
2. PILOT. f. WPN-FIRE switch Press to second
detent.
a. WEAPON SEL switch Select rocket
sparse weapons VSD. 3. MASTER switch Set as required.
4-89
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
1. VID key Selects video background source for sparse VSD. Toggles between OFF,
TV, and TIS.
2. Pitch Attitude Cue Based on rocket type and cue range specified on WEAPONS PAGE.
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(117)
