TM 9-1375-213-12
safety pin is inadvertently removed
WARNING
prior to step (h), stop all procedures
If safety pin resists movement do not
withdraw. Firing pin may have been
Disas-
released. Recheck assembly,
(e) Attach charge, etc. to coupling body
--
as desired.
(f) Layout tripwire. Direction should be
perpendicular to the longitudinal axis of the
(h) Assure safety pin is in place, but can
switch (i.e. pulling UP with respect to switch).
be easily removed. Do not remove safety pin.
Remove square head pin. Again check safety
(g) Secure one end of tripwire to a tree,
stake or some other stationary object.
pin to assure firing pin was not released.
WARNING
WARNING
Make tripwire t a u t but not tight
All personnel but the prime installer
enough to activate switch (4 lb max).
(operator) should be evacuated from
the area prior to pulling the safety pin.
NOTE
The instruction sheet packed with the
(i) Using a lanyard (length of wire or
M142 states that it can be preloaded
cord) to remove safety pin, take cover and pull
with a tension of up to 7 lb in the pull
the safety pin. Leave the area.
mode. THIS IS AN ERROR. THE
MAXIMUM ALLOWABLE PRELOAD
TENSION MUST BE LESS THAN 4
attached tripwire is pulled. The switch settings
POUNDS SINCE THE DEVICE MAY
instructions are as follows:
ACTIVATE AT OR ABOVE 4 POUNDS
(a) Assure both round and square-head
TENSION.
pivot pins are in place. Check components to
assure there are no obvious defects. Check
(h) Loop other end of tripwire through
safety pin for ease of removal. Assure legs of
tripwire hole in sear plate, adjust tension so
If legs are bent,
safety pin are straight.
that the square-head pin can be easily moved,
straighten and press them together with pliers,
Using pliers secure tripwire by twisting free
(b) Secure switch to a fixed object with
end of tripwire around the taut tripwire. This
should make the square-head pin easy to move.
(c) Secure blasting cap or time fuse into
DO NOT REMOVE IT.
coupling body as desired (c above).
(d) Assure safety pin is in place. Screw
WARNING
coupling body to switch,
move-
safetv
pin
resists
If
NOTE
ment do not withdraw. Firing pin
Removal of the safety pin is the final
may
h a v e been
released.
Re-
If the
step in all operating modes.