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The ejector racks provide attaching points for weapons gun system can be configured for operation by bumping
systems and contain impulse cartridges which allow the WEAPON SEL switch up, selecting the WEAPONS
malfunctioning weapons to be jettisoned. PAGE (fig. 4-46). The CPG can call up the WEAPONS
PAGE by positioning the WPN/ASE switch momentarily
to the WPN position on the CPG auxiliary panel.
4-54. .50 CALIBER MACHINE GUN WEAPON Pressing L-3 causes the legend to blank and a cursor
SYSTEM. to appear. A number between 0 and 999 can be
entered at the cursor. Pressing ENTER will display the
WARNING number entered on the gun symbol representing the
number of rounds loaded for the mission.
To avoid permanent eye injury, avoid d. Burst Restrictions.
direct eye exposure to AIM-1/MLR Laser
(1) After any combination of bursts not exceeding (if installed) beam. The laser contains a
50 rounds in one minute, no restriction. Class IIIb invisible radiation source.
(2) After any single burst of 150 rounds or
CAUTION consecutive bursts totaling 150 rounds, a 10-minute
cooling is required. Examples:
The maximum single burst which may be Two 75 round bursts may be fired
fired without danger of cookoff is 150 or
rounds. One 100 round burst and one 50 round burst may
The .50 caliber machine gun system (fig. 4-42) consists be fired
of a .50 caliber machine gun, an ammunition feed and
storage system, and the necessary controls and e. Operation.
components to operate the system. It is capable of Paragraphs 4-55 through 4-61 contain the procedural
recocking and safing the gun while airborne. The steps necessary to operate the system.
system is powered by the 28 Vdc essential bus. Circuit
protection is provided by the LGUN PWR and ARMT f. (CDS2) ISP or R MCPU Failure. (CDS2) ISP
CONTR circuit breakers located on the aft centerpost or R MCPU failure will cause the system to default
circuit breaker panel. This system is not jettisonable. allowing the gun to be operated in the backup mode.
The machine gun is an air-cooled, belt-fed, recoil While operating in the backup mode the following
operated, electronically controlled weapon. The gun is default conditions will apply:
mounted in a fixed position to the UWP on the left side
of the helicopter. It is capable of firing 750 - 850 rounds 1. The first detent on the WPN-FIRE switch is
per minute at a maximum effective range of 2000 not operational.
meters.
2. RECOCK and SAFE remain functional.
a. Ammunition Feed and Storage System. The
system consists of an ammunition storage can and a
4-77
TM 1-1520-248-10
FLUSH OR RAISED
RECESSED
IMPULSE CARTRIDGES REMOVED
(CARTRIDGE RETAINERS
NOTICEABLY RECESSED)
IMPULSE CARTRIDGES INSTALLED
(CARTRIDGE RETAINERS FLUSH OR
SLIGHTLY RAISED)
406071-67
G6268
1. UWP
2. Ejector rack
3. Impulse cartridge
1
2
3
3
3
Figure 4-41. Universal Weapons Pylon (UWP)
4-78
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
300 330 N 030 060 E
W 00
000
90
10
10
0.7 NM
29T
PP
HI
100
LO
25
16
L
GUN
ARMED/
500 RDS
GUN
SELECT
LEFT
W
2000 HOT
90
N 32° 48.16´
W 07° 09.59´
VID
TIS
Figure 4-42. .50 Caliber Machine Gun Weapon System
4-79
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. GUN SELECT Has no function.
3. WEAPONS STATUS Indicates OFF, SAF, ARM or STBY.
Figure 4-43. .50 Caliber Machine Gun Normal VSD
4-80
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
GUN
SELECT
LEFT
W
HOT
1
2
3
4
5
6
7
8
N 32° 18.16´
W 47° 09.59´
VID
TIS
406075-1488-9
J1336
2000P
W
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 Cue Shows MMS azimuth and elevation orientation.
3. W HOT/B HOT/NORM/INV When TIS is selected, toggles between W HOT and B HOT. With TV
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(114)
