that is attached to the demolition charge, away from
2. Unscrew and discard used coupling body,
the cut end that is attached to the firing device.
Assure firing pin and spring do not escape when cou-
pling body is removed.
3. Disassemble sear plate by removing pivot
FIRING DEVICE WITH A CONNECTED CHARGE.
pin(s). Clean all parts of the firing device and obtain a
If the safety pin cannot be inserted into
coupling base with a live primer.
switch, firing pin has released and item has
4. Obtain an unsharpened pencil with an
misfired. Leave danger area and obtain EOD
eraser or an object with a similar diameter.
personnel assistance (f below).
(b) Cheek safety pin, legs of safety pin should be
The following can be done by one person but
straight. If legs are bent, straighten and press them to-
it is easier if done by two.
gether with pliers.
5. Place all parts of the switch on a sturdy
(c) Carefully insert the safety pin into firing de-
vice. After insertion, spread legs of safety pin just
6. Insert spring into open end of switch. In-
enough to prevent accidental loss do the safety pin dur-
sert firing pin, long end with groove first, into spring.
If a safety pin is not available a piece of stiff
Letting go of the sear plate and/or pencil be-
steel wire or nail maybe used.
fore firing pin is secured can result in a
(d) If possible reinsert the pivot pin that has
forceful release of the pencil and firing pin
from the switch body. Watch your fingers-
(e) Disconnect rripwire or restraining load, de-
the device contains a very strong spring.
pending upon operating mode. Set tripwire aside for
7. Hold switch body firmly on work surface in
reuse or repacking.
a manner that permits access to open end and sear
(f) Remove mine or charge (depending upon
plate slot. Force firing pin back into cocked position
mode of operation) from firing device.
using the pencil. Insert and hold sear plate, line up
pivot holes, assure sear plate locks into groove of firing
pin. Insert both pivot pins into switch and sear plate in
DO NOT ATTEMPT to remove a blasting
original manner. Do not let go of sear plate until both
cap from a coupling base.
(g) Unscrew coupling body or base from switch.
Set coupling base aside.
The round-head pivot pin and the square-
(h) If coupling body has been used, unscrew
packing nut remove rubber gasket and pull out blast-
are not interchangeable.
8. Insert safety pin into switch in original
1. Reassemble coupling body (packing nut and
manner, spread its legs slightly so it cannot fall out by
2. Set blasting cap aside, separately and away
9. Clean and repack firing device in as close a
manner to the original as practicable. It will be diffi-
3. Set coupling body aside.
cult to roll up the tripwire in original form. Roll up
(i) Unfasten switch from its mounting (depend-
tripwire on reel if possible and tape down free end.
ing upon mode of operation).
10. Check to assure all the pieces are in con-
(j) Collect all components of firing device.
(2) Resettubg procedure.
(a) An actuated firing device with a coupling
Locally obtained screws and nails may be
body containing a fired primer may be reset for train-
used to replace originals if necessary, make
ing use, if it has not been damaged.
sure nail and screw heads are big enough to
properly secure firing device.
The primer used in the coupling body pro-
11. Mark container as a training item.
vided with the M142 firing device is not is-
(3) Disposition of material and repacking of dis-
sued separately, coupling body therefore is
not reuseable. A standard coupling base
armed firing devices.
must be used after the initial use of the cou-
(a) Inspect firing device to determine its condi-
tion. If it is unserviceable, dispose of the firing device
(b) To reset a functioned firing device:
in accordance with local disposition procedures.
1. Clean exterior of switch and assure both
(b) If firing device is considered to be in good,
pivot pins and safety pin are present, clean and
functional condition (primer has not been fired).
straight. Straighten pins with pliers if necessary.
1. Clean all components.