7. Unscrew the spent signal case or signal that has
A plastic bandoleer designed to hold seven signals
failed to fire and discard it by throwing it over the side.
is attached to the base of the projector by a 48-inch
8. Place the trigger screw in the safety slot and
reload, as in step 4, if you need to fire another signal.
The Mk 31 Mod 0 projector is a simple signaling
The following special safety precautions apply to
device. Operate it as follows:
the use of the Mk 79 kit:
1. Cock the firing pin of the projector by moving
1. Signals in this kit are ignited by percussion
the trigger screw to the bottom of the vertical slot and
primers, which should be protected against being
slipping it to the right so that it moves to the upper end of
the angular (safety) slot.
struck. Protruding tabs of the bandoleer, which extend
over the signal bases, prevent accidental striking of the
2. Break the protective plastic tab away from the
primers. Do not tear them off or bend them back except
signal you plan to attach to the projector.
when you load a signal into the projector.
2. Do not load the projector until just before you
are ready to fire the signal. If you load a signal into the
projector but do not fire it immediately, return it to the
The plastic tabs over the signals in the
bandoleer protect the percussion primers from
being struck accidentally. Do not remove a
signal's tab until just before you load the signal
into the projector.
Do NOT use dented or damaged signals.
3. Mate the projector with the signal and rotate the
Dents or other imperfections may cause violent
projector clockwise until it is seated on the signal. Pull
actions if you fire such a signal.
the signal from the bandoleer.
3. Inspect the signals periodically to ensure that
4. Hold the projector over your head with your arm
they are not dented or otherwise damaged.
fully extended. Be sure the projector is pointed at a
slight angle away from your body.
4. Keep the signals away from fire and other heat
5. While firmly gripping the projector, fire the
signal by slipping the trigger screw to the left out of the
5. Check the projector trigger screw frequently to
safety slot and into the firing slot.
ensure that it is tight. A loose trigger can release the
firing pin prematurely and cause injury, or it might fall
out and be lost during emergency loading, thereby
rendering the projector useless.
This action should be one continuous
6. Keep the trigger screw in the safety slot while
movement so that your thumb does not
you load a signal.
interfere with the forward motion of the firing
7. When you fire the projector, be sure to raise your
arm well above your head and hold the projector in a
6. If the signal fails to fire, pull the trigger screw
vertical position. NEVER point a loaded projector
back to the bottom of the firing slot against the force of
toward other personnel or toward your body.
the spring, and release it quickly.
PYROTECHNIC SAFETY, HANDLING,
The following general information is taken directly
Whenever you remove a misfired
from chapter 1 of Pyrotechnic Screening, Marking, and
cartridge, be sure to keep it pointed in a safe
direction and do NOT place any part of your
Countermeasure Devices, NAVSEA SW050-AB-
hand over the discharge end of the cartridge.