TM 9-1375-213-12
(b) If charge is to used in a borehole,
NOTE
wrap wide tape (e.g. PPP-T-60
duct tape) around the charge and
Where detonating cord or time fuse is
the attached booster charges to
being used with a cratering charge to
ease entry and descent into the
be lowered into a hole, use of a piece of
whenever
possible.
borehole
wide tape (e.g. 2 inch wide PPP-T-60
Likewise, use tape to secure deto-
tape) is advised to prevent kinking of
nating cord or fuse and keep it
the fuse/cord where it exits the priming
tunnel.
close to the charge surface to
avoid snagging.
(c) Dual priming should be done by
(3) THIRD GENERATION (NSN 1375-
01-TBD). This version of the cratering charge
use of a separately-primed booster charge of
has different design priming tunnels than previ-
approximately one pound of TNT or C-4
ous versions and is meant to be primed ONLY
secured to the bottom of the cratering charge.
Two identical, open-
with detonating cord.
TNT charges should be wrapped with the prim-
ended tunnels are provided to facilitate dual
ing detonating cord, but C-4 explosive should
priming. (Final configuration not available at
be molded around a Uli knot in the end of the
priming detonating cord. Use of several strips
of wide tape (e.g. PPP-T-60) is the preferred
(a) Run the end of each piece of deto-
method of securing the booster charge to the bot-
nating cord to be used to prime
tom of the cratering charge. Twine or wire
the charge through a priming tun-
may also be used if necessary. The priming deto-
nel so that at least one foot pro-
nating cord should not be loope around the
trudes.
periphery of the cratering charge since that
could cause a partial misfire by cutting the
(b) Tie a tight single overhand knot
charge apart before the detonating cord initi-
near the free end of the detonat-
ates the booster charge. Always take care not
ing cord.
to pinch or kink the detonating cord.
(c) Pull the detonating cord back
(2) SECOND GENERATION (NSN 1375-
through the tunnel so that the
01-378-9669). This version of the cratering
knot is tight up against the
charge may or may not have priming tunnels
mouth of the tunnel.
similar to the first generation charge, but they
should NOT be used, The SECOND GENER-
(d) Secure the knot tightly against
ATION CHARGE MUST BE PRIMED WITH
the surface of the char e at the
DEMOLITION CHARGE BOOSTERS by the
mouth of the tunnel wit a piece
of tape (e.g. PPP-T-60 duct tape)
or a piece of wire or string
(a) Secure two M112 Demolition
wrapped around the tunnel (on
Charges that are themselves
top of the knot and under the det-
primed with Detonating Cord or
onating cord at the other end of
Military Blasting Caps (M6 or
the tunnel).
M7) to the cratering charge, one
in each of the two areas indi-
(e) Use tape or string to secure deto-
cated by dotted rectangles sten-
nating cord so it will not kink or
ciled on the side of the charge.
bend sharply when the charge is
handled, positioned or placed in
a borehole (e.g. a small piece of
NOTE
tape over the detonating cord
Current Army policy precludes under-
beyond where it exits the prim-
ing tunnel holding it to the top of
ground use of blasting caps.
the charge will prevent kinking
of the detonating cord at the tun-
Other demolition charges may be
used in lieu of M112's, but two equal
nel mouth when tension is put
charges of at least one pound each
on the detonating cord during
descent into a borehole).
must be used.
Charges may be secured using their
After the charge is positioned,
(f)
own adhesive, tape, wire or string
prime the other end(s) of the deto-
depending on conditions.
nating cord(s) in any standared,
approved manner.
Change 16 2-24.1