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key selected at R-2, on IMSP/MMS configuration, toggles between NORM
(normal video) and INV (inverted video).
4. Gun reticle Gun reticle for SPARSE VSD.
5. Range-to-target Displays boxed when range is current and available. Source is “L” Laser
range, “P” prepoint range, “N” distance to direct fly-to-wpt.
6. Rounds remaining Indicates number of rounds remaining. Based on total length of time
WPN−FIRE switch is pressed.
7. Weapon Status Indicates OFF, SAFED, ARMED or STBY.
8. GUN SELECT Indicates gun is selected.
Figure 4-44. (CDS2/CDS3) .50 Caliber Machine Gun Sparse VSD
4-81
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
300 330 N 030 060 E
00
000
90
10
10
90
0.7 NM
29T
PP
HI
100
LO
25
16
L
GUN
ARMED/
500 RDS W
HOT
1
2
3
4
5
6
7
N 32° 18.16´
W 47° 09.59´
VID
TIS
2000P
W
406075-1488-9
J2997
CONTROL/INDICATOR FUNCTION
1. VID key Selects video background source for sparse VSD. Toggles between OFF,
TV, and TIS. With TIS selected white hot or black hot may be selected at R-
5.
2. MMS LOS Steering Cue Shows MMS azimuth and elevation orientation. An engagement circle is
centered on steering cue. Horizontal and vertical movements are limited by
steering cue limitations. Any portion of engagement circle outside steering
cue limitations is blanked.
3. W HOT/B HOT/NORM/INV When TIS is selected, toggles between W HOT and B HOT. With TV
key selected at R-2, on IMSP/MMS configuration, toggles between NORM
(normal video) and INV (inverted video).
4. Gun reticle Gun reticle for SPARSE VSD. Vertical position of gun reticle is determined
by Gun Offset selected on BIT/SET-UP page.
5. Range-to-target Display is boxed if current laser range is being used. If last valid laser range
is used, display is not boxed. Display is boxed while laser if firing and for 5
seconds after laser firing has stopped. Source is “L” Laser range, “P”
prepoint range, “N” distance to direct fly-to-wpt.
6. Rounds remaining Indicates number of rounds remaining. Based on total length of time
WPN−FIRE switch is pressed.
7. Weapon Status Indicates OFF, SAFED, ARMED or STBY.
Figure 4-45. (CDS4) .50 Caliber Machine Gun Sparse VSD
4-82
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
1. WEAPONS BIT/SET-UP Selects WEAPONS BIT/SET-UP PAGE. No input required for gun.
PAGE key
2. ROUNDS ENTER key Allows entry of the number of rounds loaded.
(CDS4)
3. GUN RETICLE Allows selection of gun reticle offset from 0 to -2 to -4 and back to 0.
Current offset value is boxed. Legend blank and key inop if gun not
installed.
Figure 4-46. .50 Caliber Machine Gun WEAPONS PAGE
4-83
TM 1-1520-248-10
4 - 5 5 . . 5 0 C A L I B E R M A C H I N E G U N 2. PDU BIT Accomplish.
PROCEDURES.
3. WEAPON SEL switch Select WEAPONS
CAUTION PAGE.
4. L-3 Press. Enter number of rounds loaded.
The maximum single burst which may be
fired without danger of cookoff is 150
5. WEAPONS SEL switch Select gun. rounds.
O 6. GUN switch RECOCK (strips first round
4-56. EXTERIOR CHECK PREFLIGHT. out and chambers round).
NOTE
4-57. INTERMEDIATE FUSELAGE LEFT
SIDE AREA 6. Ground personnel should hold up round and
link to indicate proper ammunition feeding.
WARNING
4-59. INFLIGHT PROCEDURES.
Anytime gun is loaded, personnel should
avoid passing in front of the gun. 1. CPG.
1. Ejector rack Check. a. Target Track with MMS as desired.
2. Ammunition can Check. NOTE
O 3. Ammunition Properly loaded. Range may be estimated.
4. Ammunition can cover Closed and locked. b. Laser range finding Complete as desired.
5. Feed chute Check. c. GUN switch ARMED.
6. Electrical connectors Secure.
d. MASTER switch ARMED.
7. Cover Open.
e. Pitch attitude Estimate required pitch
change, i f required. Advise p i l o t of
8. Bolt Forward. recommended pitch attitude as necessary.
9. Feed mechanism Aligned. 2. PILOT.
10. First round Curved portion against stripper a. WEAPON SEL switch Select gun.
with double loop link toward gun.
b. Align helicopter to target and required pitch
11. Cover Closed and locked.
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(115)
