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thumbscrew on OU and remove OU
from the ANVIS and place into protective
storage case.
4. Reattach neck cord to ANVIS.
4-1-40. Emergency Egress.
The quick-release feature allows you to exit quickly from
the aircraft in an emergency without:
a. Damaging or turning the unit off.
b. Getting tangled in cords.
c. Being restrained in the cockpit by hardwired connections.
d. Removing ANVIS.
It is up to the operator to determine the desired mode of
disconnect based upon his evaluation of the emergency
condition and whether or not the ANVIS goggles will be
needed following egress. The available means of disconnect
are as follows.
e. Release the ANVIS goggles from the helmet.
f. Disconnect the OU from the ANVIS goggles via
the thumbscrew.
g. For routine disconnect, take hold of PSCU and
rotate the quick-release connector engagement ring and
pull downward.
h. For emergency disconnect, take hold of PSCU
pull down.
TM 1-1520-240-10
4-2-1
SECTION II. ARMAMENT
4-2-1. Armament Subsystems
The armament subsystems, (fig. 4-2-1) are the M24, and
M41 machine guns installed in the cabin door, cabin escape
hatch, (M24) and on the ramp (M41). The two flexible
7.62 mm machine guns (M60D) (fig. 4-2-2) are free
pointing but limited in traverse, elevation, and depression
by cam surfaces, stops on the pintles, and pintle posts of
the left and right mount assemblies (fig. 4-2-3). Spent
cartridges are collected by an ejection control bag on the
right side of the machine gun, and an ammunition can is
on the left side (fig. 4-2-4).
4-2-2. Machine Gun.
The 7.62 machine gun (M60D) is a link-belt-fed gas-operated
air-cooled automatic weapon. Refer to TM
9-1005-224-10.
4-2-3. Mount Assemblies (M24).
The mount assemblies (fig. 4-2-5) are installed on
mounting brackets fastened inside the helicopter and
secured with mounting pins.
4-2-4. Machine Gun Controls.
For information on the operation and maintenance of the
M24 and M42 machine gun systems, refer to TM
9-1005-224-10 and 9-1005-262-13.
WARNING
To prevent injury to personnel, the cocking
handle must be returned to the forward
or locked position before firing.
WARNING
Pressing the trigger to release the bolt accomplishes
feeding and releasing of the
firing mechanism. Unless firing is intended,
make sure the machine gun is
cleared of cartridges before pressing the
trigger.
CAUTION
To prevent damage to the cartridge tray
when no ammunition is in the machine
gun, retard the forward force of the released
bolt by manually restraining forward
movement of the cocking handle.
4-2-5. Mount Assembly Stops, Cams, Quick-Release
Pin, and Shock Cord (M24).
The mount stops, cams, quick-release pin, and shock
cord have the following functions:
a. Maximum traverse (table 4-2-1) of the machine
gun are controlled by stops on both sides of the cam on
the pintle post.
b. Maximum elevation and depression are controlled
by cam surfaces on the pintle.
c. The quick-release pin (fig. 4-2-5 is attached by
cable to the mount bracket of the mount and fastens the
mount bracket to the rear bracket at the helicopter opening.
d. The shock cord (fig. 4-2-6) is fastened to the
mount bracket and to the machine gun when stowed.
4-2-6. Operation — Armament Subsystem M24.
Operate the ARMAMENT SUBSYSTEM M24 as described
in the following paragraphs.
4-2-7. Preflight Checks.
The preflight check consists of the following:
1. Machine Gun M60D — Check to make sure
that gun is thoroughly cleaned and lubricated,
operable, and secured on the pintle
with the quick-release pin (fig. 4-2-9).
2. Ejection control bag (fig. 4-2-7) — Installed
and securely latched.
3. Ammunition can (fig. 4-2-8) — Installed on
machine gun and loaded.
4. Safety — Push button to safe (S) position,
aim at clear area, and try to fire the unloaded
machine gun.
5. Mount — Secured and checked for free
pintle movement.
6. Extra ammunition boxes — Properly
stowed.
4-2-8. Before Takeoff Check.
1. Check the weapon safety is on — (S) position.
2. Inspect the chamber to be sure it is clear.
3. Close the cover and secure the machine
gun in stowed position.
TM 1-1520-240-10
4-2-2
Table 4-2-1. Armament Subsystem M24 Data
Effective range 1100 meters (max)
Rate of fire 550-650 rnds per
min
Length, overall 44.875 in
Sighting Aircraft ring and post
type
Total traversing capability - left
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